Carlston

Here's a couple of suggestions... It looks like the SKF linked to below is just for the bearings with the T meaning it's a twin pack, and it looks like the FAG includes both the bearing and the mounting but is not a twin pack so two of them would be needed. SKF VKD 35052 T Anti-Friction Bearing, suspension strut support mounting https://www.autodoc.co.uk/skf/7303776 FAG 815 0107 30 Repair kit, suspension strut https://www.autodoc.co.uk/fag/19929102

Look for alloy rims from similar cars in the VAG brands, ie. Audi, Seat, Skoda, VW. However, some cars such as big Audis have gone over to a bigger centre bore than 57.1mm so you need to make sure that the whole specification of the rim is suitable. One car that should have suitable alloy rims is the Passat B8 because it's similar to the Superb MK3. BMW and Mercedes are unlikely to fit. 5/112 and 57.1 are non-negotiable unless you start using BCD (Bolt Circle Diameter) adaptors and centre bore adaptors, ie. spigots. Then you need a suitable rim diameter, rim width, and offset. Standard alloy rims on the Superb MK3 6.5Jx16 ET41 5/112 57.1 6.5Jx17 ET41 5/112 57.1 7Jx17 ET40 5/112 57.1 8Jx18 ET44 5/112 57.1 8Jx19 ET44 5/112 57.1

Even in strict European countries such as Germany you can use a lower speed rated tyre than the car's top speed if it is winter rated. For example, a 150mph car can use 130mph tyres if they are winter rated...winter rated means the tyre has the 3PMSF symbol (3 Peak Mountain Snow Flake). However, you mustn't drive at more than 130mph on a 130mph speed rated tyre. In the UK, you can use different tyre sizes such as 215/65R16 instead of 215/60R16 provided the speedo doesn't under-read and the load index can support the weight of the car, etc. When I spoke to my insurance company, they said that one size different from standard was ok. This makes sense, because some tyre fitters will use the next size up if they don't have your size in stock. The 215/65R16 tyre size can be fitted to the standard 16" rim, ie. 6.5Jx16 ET41 5/112 57.1 The 215/65R16 tyre size will be in a different league when it comes to comfort than the 215/55R17 tyre size. You would probably have to over-inflate the 215/65R16 by at least 6psi to get a similar hard ride to the 215/55R17. However, all this is relative because a 215/55R17 is more comfortable than a 235/45R18. Continental AllSeasonContact 2 215/65R16 98H (Euro label B B 70dB) (3PMSF = winter rated) https://www.camskill.co.uk/m139b0s8008p221955/Continental_Tyres_All_Season_Car_Continental_Conti_All_Season_Contact_2_215_65_R16_98H_TL_Fuel_Eff_%3A_B_Wet_Grip%3A_B_NoiseClass%3A_B_Noise%3A_70dB

Bilstein B4 19-230559 rear shock absorber You could also consider Bilstein B4 19-252391 because this is listed against a Golf MK7 4x4 with standard ride height. It might be similar to the Bilstein B4 19-230559 except for slightly firmer damping...which could be beneficial because the rear of the 4x4 is heavier (and therefore uses slightly stiffer rear springs) than a similar front wheel drive car. However, Bilstein B4 19-252391 is not listed against many OEM part numbers so I would probably try Bilstein B4 19-230559 first. Bilstein B4 19-252391 rear shock absorber https://www.autodoc.co.uk/bilstein/9129901 Bilstein B4 19-230559 rear shock absorber https://www.autodoc.co.uk/bilstein/7503724

autodoc won't know whether it fits or not...they just look at the list of OEM part numbers that are shown against that particular shock absorber. Skoda dealers go by the OEM part numbers. They are unlikely to know whether a Bilstein shock absorber will fit any particular car, except by referring to the list of OEM part numbers that Bilstein provides against each individual shock absorber.

autodoc.co.uk lists Bilstein B4 19-230559 and Bilstein B6 24-229890 against the Octavia MK3 4x4 hatchback/estate with the following engines: 1.8TSI 180HP 2.0TSI 190HP 1.6TDI 105HP 1.6TDI 110HP 1.6TDI 115HP 2.0TDI 150HP Perhaps surprisingly, there are only five OEM part numbers that are common to both...as highlighted in bold below. Shock absorbers can sometimes be fitted to cars that don't have their OEM part numbers listed against them, but sellers will often tell you they don't fit if the OEM part number isn't listed against that particular shock absorber. Bilstein B4 19-230559 rear shock absorber 5Q0513029 BQ DA DB DP DQ DR DS EH EM EN GL ND TC 5QD513029 AA 5QM513029 A M Q AC AL 5WA513029 S T AF BC https://www.autodoc.co.uk/bilstein/7503724?search=BILSTEIN+Shock+absorber+(19-230559) Bilstein B6 24-229890 rear shock absorber 5Q0513029 BQ EB EC EK GR HH HQ 5Q0513049 BF FE 5QM513029 A M AC 5WA513029 AF 8V0513029 E F H J https://www.autodoc.co.uk/bilstein/7543304?search=BILSTEIN+Shock+absorber+(24-229890)

Quote from OP... "My question is whether anyone has any experience of swapping the standard 225/40 tyres for 235/40s, purely for a bit of extra rim protection. Does it actually protect the rim or not?" In summary, the answer is yes but not by much. To put the numbers into context, at least 15mm of tyre sidewall bulge will give good rim protection and at least 18mm of tyre sidewall bulge will give excellent rim protection. For example a 215/60R16 fitted to a 6.5J rim (eg. Superb MK3) gives good rim protection because it has over 15mm of tyre sidewall bulge and a 215/60R16 fitted to a 6J rim (eg. Karoq front wheel drive) gives excellent rim protection because it has over 18mm of tyre sidewall bulge. Here's another couple of interesting examples where there may be only a 1" difference in the diameter of the wheels, but when it comes to rim protection the difference couldn't be more stark. Amount of tyre sidewall bulge on Karoq 4x4 (18" and 19" wheels) 225/50R18 fitted to 7J rim (over 15mm, so good rim protection from kerbing damage) 225/45R19 fitted to 8J rim (less than 3mm, so almost zero rim protection from kerbing damage) Amount of tyre sidewall bulge on Kodiaq MK1 (19" and 20" wheels) 235/50R19 fitted to 7J rim (over 18mm, so excellent rim protection from kerbing damage) 235/45R20 fitted to 8J rim (less than 6mm, so almost zero rim protection from kerbing damage)

205/50R17 fitted to 6J rims would offer a lot of rim protection because the sidewalls bulge out by about 15.8mm each side. However, on the VRS these are really meant as a winter tyre size. The Scout's 225/50R17 tyre size offers a similar 15.6mm of sidewall bulge each side on its 7J rim width. What is happening, is that once you get up to a 50 or higher aspect ratio tyre (ie. 50, 55, 60, 65, etc.) the sidewalls tend to bulge out from the rim a lot more than the 45 or lower aspect ratio tyres (45, 40, 35, etc.). Bear in mind in the chart below that according to ETRTO 235/40R18 and 235/35R19 need at least an 8J rim width, ie. 7.5J is undersize for these tyre sizes. Amount sidewalls bulge out each side of rim (the bigger the number, the more rim protection from kerbing damage) 205/50R17 fitted to 6J rim 15.8mm 225/50R17 fitted to 7J rim 15.6mm (Scout tyre size) 205/50R17 fitted to 6.5J rim 12.45mm 225/45R17 fitted to 7J rim 8.6mm 235/40R18 fitted to 7.5J rim 7.25mm (non-standard tyre size) (undersize rim width, ie. not ETRTO approved) 235/35R19 fitted to 7.5J rim 7.25mm (non=standard tyre size) (undersize rim width, ie. not ETRTO approved) 225/45R17 fitted to 7.5J rim 5.25mm 225/40R18 fitted to 7.5J rim 4.75mm 225/35R19 fitted to 7.5J rim 4.75mm 6Jx17 ET48 5/112 57.1 alloy rim CRYSTAL (from Octavia MK3) https://eshop.skoda-auto.cz/cs_CZ/alu-kola/c/alloyWheels?sort=priceAsc&q=%3AscoreDesc%3AcarType%3AOctavia%2BIII%2B%282017%2B%29%3ArimDiameter%3A17%22#

On the powerful Superb MK3 4x4 280HP, 225/55R17 on 7Jx17 ET40 rims would probably make more sense than 215/60R17.

As you can see in the chart below, the actual inflated width of the standard 235/45R18 fitted to its 8J rim is 22mm wider (ie. 11mm wider each side) than the 215/55R17 fitted to its 6J rim...so although the centre of the ET48 rim is pushed into the wheelarch by 4mm more than the ET44 rim, that 11mm of extra clearance means that there is 7mm of extra clearance. So no chance of rubbing. Actual inflated width of tyre (measured from sidewall to sidewall, at the widest point) 215/55R17 fitted to 6Jx17 ET48 214mm 235/45R18 fitted to 8Jx18 ET44 236mm One benefit of fitting 215/55R17 to relatively narrow 6J rims is that the rim gets a lot of protection from kerbing damage because the sidewalls bulge out by 18.8mm each side. 18.8mm is huge. By comparison the sidewalls on the 235/45R18 fitted to its 8J rim only bulge out by 4.4mm each side, thereby providing the rims with very little protection from kerbing damage.

On the Superb MK3, the 215/55R17 tyre size is usually fitted to either 6.5Jx17 ET41 or 7Jx17 ET40. So compared to 6.5Jx17 ET41, the 6Jx17 ET48 rim is 0.5" narrower and the offset if 7mm greater. This could be useful if you drive in an area with lots of 2 metre width restrictions because the front and rear track if measured on the outside of the rims is reduced by 26.7mm when changing from 6.5Jx17 ET41 to 6Jx17 ET48 rims or 41.4mm when changing from 7Jx17 ET40 rims to 6Jx17 ET48 rims. When changing from 8Jx18 ET44 or 8Jx19 ET44 rims to 6Jx17 ET48 the reduction in front and rear track if measured on the outside of the rims is even greater at 58.8mm. With a wide car like the Superb MK3 on standard rims, it can be very easy to damage the alloy rims when going through these narrow width restrictions. For even more ride comfort, also consider oversize 215/60R17 on these rims. The front wheel drive Karoq also fits its 215/60 tyres (albeit 16") to narrow 6J rims. 6Jx17 ET48 5/112 57.1 alloy rim CRYSTAL (from Octavia MK3) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-crystal-17-octavia-iii/p/5E0071496A+8Z8

google maps has a gps speedo function, so it's easy to check the accuracy of the speedo. I doubt 225/55R17 would cause the speedo to under-read.

ATE 11.9541-9595.2 left brake caliper (54mm piston diameter) 1J0615123B 1J0615123C 1J0615123D 1U0615123 8L0615123 8N0615123 https://www.autodoc.co.uk/ate/955174#brake-caliper ATE 11.9541-9596.2 right brake caliper (54mm piston diameter) 1J0615124B 1J0615124C 1J0615124D 1U0615124 8L0615124 8N0615124 https://www.autodoc.co.uk/ate/955175#brake-caliper ATE 11.0230-0451.1 brake caliper carrier (left and right is the same) 1J0615125A 4B0615125A 8L0615125 8N0615125 https://www.autodoc.co.uk/ate/12769955 ATE 13.0460-7081.2 front brake pads (without wear warning contact) (standard brake pads) 1J0698151L 3A0698151 3A0698151A 8N0698151 https://www.autodoc.co.uk/ate/956177#brake-pad-set ATE 13.0470-7081.2 front brake pads (without wear warning contact) (ceramic brake pads) 1J0698151L 3A0698151 3A0698151A 8N0698151 https://www.autodoc.co.uk/ate/956453#brake-pad-set ATE 13.0460-7122.2 front brake pads (with wear warning contact) (standard brake pads) 1J0698151K 1J0698151M 1J0698151Q 8N0698151A 8N0698151C 8N0698151E https://www.autodoc.co.uk/ate/956204#brake-pad-set ATE 13.0470-7122.2 front brake pads (with wear warning contact) (ceramic brake pads) 1J0698151K 1J0698151M 1J0698151Q 8N0698151A 8N0698151C 8N0698151E https://www.autodoc.co.uk/ate/956463#brake-pad-set ATE 24.0125-0123.1 front brake disc (310x25mm, 5/100) (standard version) 6R0615301B 6R0615301E 8L0615301 8N0615301A https://www.autodoc.co.uk/ate/957594#brake-disc ATE 24.0325-0123.1 front brake disc (310x25mm, 5/100) (powerdisc version) 6R0615301B 6R0615301E 8L0615301 8N0615301A https://www.autodoc.co.uk/ate/958232#brake-disc

With the 7Jx17 ET45 rims, you could change the standard 225/50R17 to 215/55R17, 225/55R17, or 235/55R17. The front wheel drive Karoq uses 215/55R17 on its 7Jx17 ET45 rims, and the Karoq 4x4 uses 225/55R17 on its 7Jx17 ET45 rims. When changing to a non-standard tyre size, it's always important to check the ETRTO rules to make sure that the tyre size that you are considering can be fitted to that particular rim width. As you can see in the chart below, all three of these 55 aspect ratio tyres can be fitted to a 7" rim width. The highlighted number is what is considered the standard rim width for that particular tyre size, but even car manufacturers will often deviate from this standard rim width...but never outside of the rim width range for that particular tyre size. ETRTO approved rim widths for passenger car tyres 215/55R17 6.0-7.0-7.5 225/55R17 6.0-7.0-8.0 235/55R17 6.5-7.5-8.5 All of these 55 aspect ratio tyres should help to improve the ride, compared to the standard 225/50R17 tyre size. It's important to realise that oversize tyres raise the car's gearing which can have a negative effect on the car's drivability...particularly 1st gear and top gear...so it's important to consider how the engine is pulling the standard gearing, particularly low down in the rev range before oversizing tyres. The Yeti's natural successor is the Karoq, and in the charts below you can see the standard tyre and rim combinations that are used on both the front wheel drive version of the Karoq and the 4x4 version of the Karoq. Notice that compared to the Yeti things have gone a bit silly with the front wheel drive Karoq ending up with a 40 aspect ratio tyre...that many front wheel drive Karoq owners complain of after the thrill of new wide and low profile tyres has worn off. So the Yeti with its 225/50R17 isn't that extreme...but it can be improved upon if comfort is your goal. Karoq front wheel drive tyre and rim sizes 215/60R16 6Jx16 ET43 215/55R17 7Jx17 ET45 215/50R18 7Jx18 ET45 225/40R19 8Jx19 ET45 (there's also a 235/40R19 option for this rim specification) Karoq 4x4 tyre and rim sizes 225/60R16 6Jx16 ET43 225/55R17 7Jx17 ET45 225/50R18 7Jx18 ET45 225/45R19 8Jx19 ET45 (there's also a 245/40R19 option for this rim specification) On the Yeti, if it's a choice between 215/55R17, 225/55R17, and 235/55R17, I would probably go for the 215/55R17. It's a well liked tyre and rim combination on the front wheel drive Karoq and is a world away from the hard riding 225/40R19. Continental AllSeasonContact 2 215/55R17 94V (Euro label B B 70dB) https://www.mytyres.co.uk/rshop/tyre/Continental/AllSeasonContact-2/215-55-R17-94V-EVc/D-127980 In the below chart, I've used the standard 215/60R16 tyre size as a reference point when considering the outside diameters of the other tyre sizes. Outside diameter of tyres 215/60R16 664.4mm 225/50R17 656.8mm (1.1% smaller outside diameter compared to 215/60R16) 215/55R17 668.3mm (0.6% bigger outside diameter compared to 215/60R16) 225/55R17 679.3mm (2.2% bigger outside diameter compared to 215/60R16) 235/55R17 690.3mm (3.9% bigger outside diameter compared to 215/60R16)

I would go for 215/60R17 fitted to 6.5Jx17 ET38 rims (from the Kodiaq) rather than 235/55R17 fitted to 7Jx17 ET45 rims...given a choice between the two. More comfortable, less weight, less noise, less drag, more mpg, 14mm wider front and rear track, and both steel and alloy rims are available in this specification. It's also easier to get a tyre that's not massively over-specified in the 215/60R17 tyre size compared to the 235/55R17 tyre size. Continental AllSeasonContact 2 215/60R17 96H (Euro label B B 70dB) (3PMSF) https://www.camskill.co.uk/m140b0s8016p221935/Continental_Tyres_All_Season_Car_Continental_Conti_All_Season_Contact_2_215_60_R17_96H_TL_Fuel_Eff_%3A_B_Wet_Grip%3A_B_NoiseClass%3A_B_Noise%3A_70dB Alcar 9021 6.5Jx17 ET38 5/112 57.1 steel rim (from Kodiaq) (11.58kg) https://www.mytyres.co.uk/rims/details?vehicleId=639488607098246256&rimCode=ALCAR9021 https://www.oponeo.pl/felga-stalowa/alcar-kfz-9021#24532297 6.5Jx17 ET38 5/112 57.1 alloy rim NANUQ (from Kodiaq) (11.5kg) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-nanuq-17-kodiaq/p/565071497++8Z8 https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-nanuq-17-kodiaq/p/565071497D+FL8

On the Yeti, the standard 16" tyre sizes (205/55R16 and 215/60R16) will fit a 6.5Jx16 ET50 rim without rubbing. You can tell this by referring to the below chart, where the standard 17" tyre size (225/50R17) has an actual width of 233mm when fitted to the standard 7Jx17 ET45 rim. Actual inflated width of tyre (measured from sidewall to sidewall, at widest point) 205/55R16 fitted to 6.5J rim 214mm 215/60R16 fitted to 6.5J rim 221mm 225/50R17 fitted to 7J rim 233mm 235/55R17 fitted to 7J rim 239mm (oversize tyre size) The owner of the below Yeti managed to fit 235/55R17 to his standard 7Jx17 ET45 rims, so the standard 225/50R17 isn't even close to rubbing. There's going to be even more clearance with the narrower 205/55R16 and 215/60R16 tyre sizes fitted to a 6.5Jx16 ET50 rim. Top photo 225/50R17, Bottom photo 235/55R17 (SCUDO 7Jx17 ET45 alloy rims) However, if you're looking for a much cheaper tyre size than 215/60R16...205/70R15 could be the answer. For example, the below Yokohama All-Terrain tyre costs 47% more in the 215/60R16 tyre size compared to the 205/70R15 tyre size. At 70dB noise rating, this 205/70R15 is also slightly quieter than the 71dB noise rating of the slightly wider 215/60R16 tyre. Bear in mind that the 1.2TSI Yeti has small 280x22mm front brake discs, so 15" rims will easily clear the front brake calipers. Yokohama Geolandar AT G015 205/70R15 96H (Euro label E C 70dB) https://www.camskill.co.uk/m53b0s2481p148166/Yokohama_Tyres_Car_Yokohama_Geolandar_AT_G015_205_70_R15_96H_RPB_TL_Fuel_Eff_%3A_E_Wet_Grip%3A_C_NoiseClass%3A_B_Noise%3A_70dB Yokohama Geolandar AT G015 215/60R16 95H (Euro label E C 71dB) https://www.camskill.co.uk/m62b0s111p164244/Yokohama_Tyres_Car_Yokohama_Geolandar_AT_G015_215_60_R16_95H_RPB_TL_Fuel_Eff_%3A_E_Wet_Grip%3A_C_NoiseClass%3A_B_Noise%3A_71dB Alcar 9165 6Jx15 ET47 5/112 57.1 steel rim (from Octavia MK2) (7.73kg) https://www.mytyres.co.uk/rims/details?vehicleId=183006013861926000&rimCode=ALCAR9165 https://www.oponeo.pl/felga-stalowa/alcar-kfz-9165#24341785 Alcar 9915 6.5Jx16 ET50 5/112 57.1 steel rim (from Octavia MK2) (8.35kg) https://www.mytyres.co.uk/rims/details?vehicleId=182673411594523760&rimCode=ALCAR9915 https://www.oponeo.pl/felga-stalowa/alcar-kfz-9915#24341769 Vredestein Quatrac 5 205/70R15 96T (Euro label C C 69dB) https://www.camskill.co.uk/m138b0s7998p144823/Vredestein_Tyres_All_Season_Car_Vredestein_Quatrac5_Vredestein_Quatrac_5_205_70_R15_96T_TL_Fuel_Eff_%3A_C_Wet_Grip%3A_C_NoiseClass%3A_A_Noise%3A_69dB

Bilstein B6 shock absorbers are for standard ride height cars. Bilstein B8 shock absorbers are for lower ride height cars (aka, sports suspension). The Bilstein B8 shock absorbers are only 20mm shorter than the Bilstein B6, so the idea that cars need to have at least a 30mm to 40mm drop for Bilstein B8 to work is incorrect. This idea that you need at least a 30mm to 40mm drop has probably come about because Bilstein B8 shock absorbers are sometimes sold in a kit with Eibach lowering springs where there might sometimes be a 30mm to 40mm drop compared to standard ride height...but Bilstein don't primarily aim their Bilstein B8 shock absorbers at Eiback lowering springs for which there is a very limited market but the much bigger market of VAG lowered ride height cars, ie. about 15mm drop.

Your Superb MK3 1.6TDI estate has lowered ride height...which Skoda also calls sports suspension. Lowered ride height means that the unladen ride height is about 15mm lower than standard ride height. Going back to your first post, you have retrofitted 19" wheels...presumably 235/40R19 tyres and yet you want a comfortable ride. Fitting such low profile tyres, ie. tyres with only 94mm of sidewall height (235mm x 0.4 = 94mm) is not the way to get the best ride comfort. 16" and 17" tyres with their much bigger sidewalls are going to put the ride comfort in a different league compared to these hard riding 19" tyres. For the standard ride height Superb MK3 1.6TDI estate Kilen/Lesjofors and gknautomotive.com list 5Q0411105GL front springs and 3Q0511115AK rear springs. Even if you have factory fitted lowered ride height shock absorbers, you could probably get away with fitting them without changing the shock absorbers...although if you do change the shock absorbers it makes sense to match them with standard ride height shock absorbers...which including the Bilstein B6. Superb MK3 1.6TDI estate - standard ride height front springs that are sold to replace 5Q0411105GL include the following two springs (actually the same spring, made in the same factory in Sweden) but there are many other brands Kilen 23131 Lesjofors 4085732 https://www.autodoc.co.uk/car-parts/oem/5q0411105gl?supplier[]=253&supplier[]=246 Superb MK3 1.6TDI estate - standard ride height rear springs that are sold to replace 3Q0511115AK include the following two springs (actually the same spring, made in the same factory in Sweden) but there are many other brands Kilen 65124 Lesforfors 4295134 https://www.autodoc.co.uk/car-parts/oem/3q0511115ak?supplier[]=253&supplier[]=246 Kilen/Lesjofors aren't listing any sports springs for the Superb MK3 1.6TDI estate, but gknautomotive.com are listing 5Q0411105HD front sports springs and 3Q0511115AB rear sports springs. Front springs on hatchback and estate versions of the same car are usually the same because the front axle weight is the same...however, gknautomotive.com are listing slightly stiffer 5Q0411105HE front sports springs for the Superb MK3 1.6TDI hatchback. Note that the actual springs fitted by Skoda in the factory will often be slightly different to what is shown in the various online spring catalogues...but there shouldn't be much difference, often only one weight range difference if there is a difference. According to Sachs, the 5Q0411105GL standard ride height front springs have a wire diameter of 12mm and the 5Q0411105HD lowered ride height front springs have a wire diameter of 12.25mm...so are about 5% stiffer than the standard ride height springs. According to Sachs, the 3Q0511115AK standard ride height rear springs have a wire diameter of 12.25mm and the 3Q0511115AB lowered ride height rear springs have a wire diameter of 13mm...so would be about 15% stiffer, but 3Q0511115AB also has a smaller number of coil turns so are about 20% stiffer. 20% is a lot, so changing to standard ride height springs would help soften the rear axle a lot. Because 3Q0511115AK standard ride height rear springs are so much softer than 3Q0511115AB lowered ride height rear springs, you may prefer the slightly stiffer 3Q0511115AL rear springs...but these are still about 15% softer than the hard riding 3Q0511115AB rear sports springs. Bear in mind, that many Superb MK3 estate owners complain that their standard ride height rear springs feel a bit too soft...so these 3Q0511115AL standard ride height rear springs being about 5% stiffer (this is a small amount that you will only just notice) might feel just right, yet still much softer than the hard riding lowered ride height rear springs. 3Q0511115AL standard ride height rear springs (one weight range higher than 3Q0511115AK, which is about 5% stiffer) Kilen 65125 Lesjofors 4295135 https://www.autodoc.co.uk/car-parts/oem/3q0511115al?supplier[]=253&supplier[]=246

I expect you're talking about 205/45R16 and 195/55R15 tyre sizes. If so, going to 185/65R14 would improve the ride even more...perhaps fitted to 6Jx14 ET37 rims...which is a standard tyre and rim combination on the Roomster. On the Fabia MK2, Skoda used 185/60R14 instead of 185/65R14 on this rim specification...which doesn't really make sense because 185/65R14 closely matches the outside diameter of the 195/55R15 and 205/45R16 tyre sizes, whereas the outside diameter of 185/60R14 is quite a bit smaller than the 195/55R15 and 205/45R16 tyre sizes. However, 14" rims won't clear the front brake calipers if the front brake discs are bigger than 256x22mm. Alcar still make their Alcar 7250 which has a specification of 6Jx14 ET37 5/100 57.1 specification...as shown in the links below. However, for an even more comfortable ride a narrow 5J rim width could be used. The Fabia MK1 to MK2 uses a 5Jx14 ET35 rim with its 165/70R14 tyre size, the Fabia MK3 used this same 5Jx14 ET35 rim with its 175/70R14 tyre size, and the Fabia MK4 uses a 5Jx14 ET38 rim with its 185/70R14 tyre size. Fitting a 185/65R14 to a 5J rim won't give such sharp steering response as fitting this tyre size to a wider 6J rim, but the ride is more comfortable on the narrower rim because the sidewalls are able to flex more easily. I've used a 185/65R14 on a 5J rim and really liked the comfort but the steering response wasn't the sharpest...it was a bit like driving a Rolls Royce rather than a Ferrari...so which rim width you use really depends on your priorities. Another benefit of using a relatively narrow rim is that the sidewalls bulge out more, which gives better protection from kerbing damage. Alcar 7250 6Jx14 ET37 5/100 57.1 steel rim (7.23kg) https://www.mytyres.co.uk/rims/details?vehicleId=183698156431610980&rimCode=ALCAR7250 https://www.oponeo.pl/felga-stalowa/alcar-kfz-7250#23373673 As you can see in the chart below, the sidewalls of a 185/65R14 tyre size bulge out a lot more each side when fitted to a narrower 5J rim width compared to a 6J rim width. This really helps protect the rim when parallel parking against kerb damage. I've also added a 5.5J rim width to show that this increase is a gradual thing, ie. as the rim width becomes narrower the tyre bulge becomes greater. Amount of sidewall bulge 185/65R14 fitted to 6J rim 9.3mm 185/65R14 fitted to 5.5J rim 12.65mm 185/65R14 fitted to 5J rim 16mm When fitting tyres to a non-standard rim width it's important to check the ETRTO rules for compliance. As you can see in the ETRTO chart below, a 185/65R14 is allowed to be fitted to a rim width between 5" and 6.5". 5.5" is highlighted because that is the standard rim width for a 185/65R14 tyre size, although car manufacturers will often vary from this standard rim width...but usually by no more than 0.5" each side and never outside of these ETRTO rules. ETRTO approved rim widths for passenger car tyres 185/65R14 5.0-5.5-6.5

As you can see in the two charts below, the bigger brake discs don't just have a bigger diameter but are thicker too...so new brake calipers are required. However, I suggest you look into fitting 314x30mm front brakes only because as well as being a lot cheaper than changing front and back will allow you to still run 16" wheels. This can be handy if you've got a 16" spare because even the 310x22mm rear discs would need at least 17" rims to clear the rear brake calipers (according to one forum member, but I suspect this is true). The only Skoda the 314x30mm front brake discs were used on was the Kodiaq, probably the 150HP model...although that is a heavier car than the Octavia MK3. The 314x30mm appears to be a much cheaper brake disc size than 340x30mm but is similarly bulky due to the shared 30mm brake disc width and they both use the same beefy front brake calipers. The 314x30mm front brakes are a TRW brake system. Front brakes 312x25mm 340x30mm Rear brake discs 272x10mm 310x22mm Skoda parts diagram for 314x30mm front brakes (from Kodiaq) https://www.lllparts.co.uk/catalogs/skoda/CZ/KOD/804/6/615/615010 Left brake caliper for 314x30mm and 340x30mm front brake disc 3C0615123 https://www.autodoc.co.uk/trw/2184642#brake-caliper Right brake caliper for 314x30mm and 340x30mm front brake disc 3C0615123 https://www.autodoc.co.uk/trw/2184643#brake-caliper Left brake caliper carrier for 314x30mm front brake disc 7N0615125 https://www.autodoc.co.uk/trw/2183223#carrier-brake-caliper Right brake caliper carrier for 314x30mm front brake disc 7N0615126 https://www.autodoc.co.uk/trw/2183224#carrier-brake-caliper ATE 314x30mm front brake disc 1K0615301AJ https://www.autodoc.co.uk/ate/7005983#brake-disc I've added diagrams of the front brake pads for the 312x25mm front brake discs and the 314x30mm/340x30mm front brake discs. The 314x30mm and 340x30mm front brake discs use the same front brake pads because they use the same front brake calipers. I would estimate that the 314x30mm/340x30mm front brake pads have at least a 15% increase in braking surface area of the brake friction material. Bear in mind the pistons on the front brake calipers for the 312x25mm front brake discs have a diameter of 57mm, whereas the pistons on the front brake calipers for the 314x30mm/340x30mm front brake discs have a piston diameter of 60mm...which results in about a 10% increase in force being applied to the brake pads when the brake pedal is pressed with the same amount of force. So all this adds up to more braking force, bigger pad area, and those bigger more beefy brake discs which take longer to heat up and can dissipate the heat quicker. TRW GDB1956 front brake pads for 312x25mm front brake disc TRW GDB2114 front brake pads for 314x30mm and 340x30mm front brake disc 8V0698151C https://www.autodoc.co.uk/trw/11288579#brake-pad-set I've added three diagrams of the 312x25mm, 314x30mm, and 340x30mm front brake discs. Notice that the 312x25mm front brake discs have a 8.5mm gap for cooling (the ventilated part), whereas the 314x30mm front brake discs have a 10.5mm gap...so that's well over a 20% bigger gap for cooling (the ventilated part). 312x25mm front brake disc 8.6kg https://www.autodoc.co.uk/brembo/1657592#brake-disc 314x30mm front brake disc 9.4kg https://www.autodoc.co.uk/brembo/8714198#brake-disc 340x30mm front brake disc 10.8kg https://www.autodoc.co.uk/brembo/8714327#brake-disc

The Sportline doesn't have standard suspension, ie. standard ride height...it has sports suspension, ie. lowered ride height. I would go for the Bilstein B8's instead of the Bilstein B6's. I looked at some information and the Bilstein B8's are only 20mm shorter than the Bilstein B6's, so the sometimes quoted opinions that you need at least a 30mm to 40mm drop for the Bilstein B8's to work is incorrect. This actually makes sense, because Bilstein want to sell their Bilstein B8's in large quantities, not restrict their sales to only cars that have been dropped by at least 30mm to 40mm. The Bilstein listings themselves say that the B6's are for standard suspension and that the B8's are for sports suspension...as you can see in the links below. Standard suspension = Standard ride height Sports suspension = Lowered ride height Bilstein B6 standard ride height shock absorbers (for Superb MK3) 35-229872 front shock absorbers https://www.autodoc.co.uk/bilstein/7522722?search=BILSTEIN+Shock+absorber+(35-229872) 24-229890 rear shock absorbers https://www.autodoc.co.uk/bilstein/7543304?search=BILSTEIN+Shock+absorber+(24-229890) Bilstein B8 lowered ride height shock absorbers (for Superb MK3) 35-229919 front shock absorbers https://www.autodoc.co.uk/bilstein/7522724?search=BILSTEIN+Shock+absorber+(35-229919) 24-229937 rear shock absorbers https://www.autodoc.co.uk/bilstein/7522727?search=BILSTEIN+Shock+absorber+(24-229937)

Bilstein B4 aren't listed against 3C0413031BC, but Sachs 317 574 are. Sachs 317 574 (listed against 3C0413031BC and many other OEM part numbers) https://www.autodoc.co.uk/sachs/14544398 Not specifically listed against 3C0413031BC, but these Bilstein B4 front shock absorbers should fit because the listing states that they are for the G06 build code. They are also listed for the Octavia MK2 2.0TDI 140HP estate 4x4 Scout, ie. increased ride height. Bilstein B4 22-183729 front shock absorbers (55mm strut) https://www.autodoc.co.uk/bilstein/1043473

One blue dot and one grey dot means it's a 5Q0411105GM front spring...as shown in the Superb MK3 parts catalogue. https://www.lllparts.co.uk/catalogs/skoda/CZ/SUP/851/4/411/411000 One aftermarket replacement spring option is Kilen 25117. This spring is sold to replace two OEM part numbers, the other being 5Q0411105CG...so might not be an exact match, but Kilen thinks that it's close enough if indeed it is slightly different from 5Q0411105GM. Front aftermarket front springs listed on autodoc to replace 5Q0411105GM (but not necessarily identical) https://www.autodoc.co.uk/car-parts/oem/5q0411105gm?search=OEN+5Q0411105GM Kilen 25117 front spring (sold to replace both 5Q0411105GM and 5Q0411105CG front springs, so might not be identical) https://www.ebay.co.uk/itm/192915631490 Sachs 993 905 front spring (sold to replace just 5Q0411105GM, so should be identical) https://www.autodoc.co.uk/car-parts/oem/5q0411105gm?supplier[]=32

Both the Yeti and the Superb MK2 use the same specification 16" rims, ie. 6Jx16 ET50 and 7Jx16 ET45. However, the tyre size could be different as the Yeti used either 205/55R16 or 215/60R16...whereas the Superb MK2 only used the smaller 205/55R16. As the tyres have a H speed rating it's important not to exceed the 130mph/210km/h limit for these tyres...if the car has a top speed greater than this. The November 2014 edition of the Superb MK2 owner's manual says that snow chains can be used with the 205/55R16 tyre size when fitted to either the 6Jx16 ET50 or 7Jx16 ET45 rim...but only on the front wheels, and only with 9mm chains.

Good point, as petrol versions of the Octavia MK3 VRS use the big 340x30mm front brake discs. However, the pre-facelift Octavia MK3 VRS cars (petrol and diesel) use 272x10mm rear brake discs...so 16" wheels will clear the rear brake calipers. To be sure what brakes are fitted it's always best to check the car's build codes.