Carlston

One non-standard option for 16" wheels on the Fabia MK4 is 205/55R16 6Jx16 ET38 from the Scala. One non-standard option for 17" wheels on the Fabia MK4 is 205/50R17 6.5Jx17 ET40 from the Scala. Another non-standard option for 17" wheels on the Fabia MK4 is 7Jx17 ET46 from the Fabia MK3, with either 205/50R17 or 215/45R17 tyres. Outside diameter of tyre 195/55R16 620.9mm (Fabia MK4) 215/45R17 625.3mm (Fabia MK4) 215/40R18 629.2mm (Fabia MK4) 205/55R16 631.9mm (Scala) 205/50R17 636.8mm (Scala) 205/45R18 641.7mm (Scala) Rim specification 6Jx16 ET45 (Fabia MK4) 7Jx17 ET51 (Fabia MK4) 7Jx18 ET51 (Fabia MK4) 6Jx16 ET38 (Scala) 6.5Jx17 ET40 (Scala) 7Jx18 ET39 (Scala) 6Jx16 ET38 5/100 57.1 alloy rim MONTADO 654071496AH FL8 (from Scala) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-montado-16-scala-kamiq/p/654071496AHFL8 6.5Jx17 ET40 5/100 57.1 alloy rim PROPUS 654071497AG FL8 (from Scala) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-propus-17--scala-kamiq/p/654071497AGFL8 7Jx17 ET46 5/100 57.1 alloy rim TORINO 5JA071497AA JX2 (from Fabia MK3) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-torino-17-fabia-iii-rapid/p/5JA071497AAJX2

Eibach R18812 lowered ride height front springs and Eibach R21875 lowered ride height rear springs should provide a similar ride height to a car that left the factory with lowered ride height, eg. a SportLine.

Sportline springs are lowered ride height. B6 is for lowered ride height, and is only available for non-DCC. B6 non-DCC and B8 non-DCC have a better monotube design compared to the B8 DCC twintube design.

Superb MK3 2.0TSI/2.0TDI hatchback FWD (Front Wheel Drive) Treat the below numbers as only approximate. My best guess is 30mm front drop and 25mm rear drop...assuming a 5Q0411105GM/3Q0511115AK starting point. The actual front and rear drop could vary significantly from this estimate. Sachs 993905 standard ride height front spring (matches 5Q0411105GM) Length 315mm, Wire diameter 12.25mm https://www.autodoc.co.uk/sachs/14436096 Sachs 994977 standard ride height rear spring (matches 3Q0511115AK) Length 364mm, Wire diameter 12.25mm https://www.autodoc.co.uk/sachs/15244168 Eibach R18812 lowered ride height front spring (sold to replace 5Q0411105HF and one other spring) Length 282mm, Wire diameter 12.50mm https://www.autodoc.co.uk/eibach/17876012 Eibach R21875 lowered ride height rear spring (sold to replace 3Q0511115AB and one other spring) Length 330mm, Wire diameter 13.00mm https://www.autodoc.co.uk/eibach/18112504

ICE (Internal Combustion Engine) VAG Skodas have so far used offsets ranging from ET35 to ET54. So there are no Zero or Negative offsets for these cars, ie. all of the offsets are positive. However, the below diagram illustrates what Zero and Negative offsets look like...as well as positive offsets. The Yeti uses offsets between ET45 and ET50. Coming from the standard 17" Yeti wheel size, ie. 225/50R17 7Jx17 ET45, and going to 6Jx16 ET50 or 6.5Jx16 ET50 will move the centre of the wheel 5mm inwards. Increasing the offset from ET45 to ET50 will make the wheel look a little more sunken in the wheelarch. When going from ET45 to ET50, the front track and the rear track are both reduced by 10mm. ET means "Einpress Tiefe", which is German for offset...so ET45 means "offset is 45mm". The offset is usually stamped or cast into each rim in the format ETxx (or ET-xx when the offset is negative). Wheel offset diagram

With aftermarket alloy rims, you usually need different wheel bolts (of the correct length) because they tend to use cone shaped (conical) seats whereas VAG rims use ball shaped (sphere/spherical) seats. With aftermarket alloy rims, you usually need spigot rings because Skodas have a 57.1mm centre bore. Aftermarket alloy rims tend to have a centre bore bigger than 57.1mm.

The only wheels that Skoda approve for snow chains on both the Kodiaq MK1 and Kodiaq MK2 is 215/65R17 6.5Jx17 ET38. Skoda also list a 7Jx17 ET40 rim, but that specification is not approved by Skoda for use with snow chains. Alcar 9015 6.5Jx17 ET38 5/112 57.1 steel rim (for Kodiaq MK1/MK2) https://www.mytyres.co.uk/rims/details?vehicleId=672860434273997936&rimCode=ALCAR9021 6.5Jx17 ET38 5/112 57.1 alloy rim NANUQ 565071497 8Z8 (for Kodiaq MK1/MK2) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-nanuq-17-kodiaq/p/565071497++8Z8 Snow chains 000091387AS (for Kodiaq MK1/MK2) https://eshop.skoda-auto.cz/cs_CZ/sada-nerezovych-snehovych-retezu/p/000091387AS

Both 6Jx17 ET45 and 6Jx17 ET48 are listed in the July 2019 owner's manual for the Octavia MK3 RS. The 2019 Skoda parts catalogue lists the following 6Jx17 alloy rims for the Octavia MK3, as shown below. 2019 Skoda parts catalogue 1 5E0071497B Aluminium rim 6Jx17 ET45 4 FLASH 5E0071497B 7ZS chrome coloured metallic 1 5E0071496A Aluminium rim 6Jx17 ET48 4 CRYSTAL 5E0071496A 8Z8 Diamond silver 1 5E0071497E Aluminium rim 6Jx17 ET48 4 CRYSTAL 5E0071497E FL8 Black metallic https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/805/0/071/71070

Skoda produce the CoC at the time the car is manufactured. The CoC doesn't get updated. When a new model Skoda is first released, Skoda will have already decided all of the possible wheel sizes. 17" wheel sizes (for Octavia MK3, not including Scout) 205/50R17 6Jx17 ET45 (suitable for snow chains) 205/50R17 6Jx17 ET48 (suitable for snow chains) 225/45R17 7Jx17 ET49 (not suitable for snow chains) 225/45R17 7.5Jx17 ET51 (not suitable for snow chains) When it comes to wheels, many EU countries require a strict adherence to what listed in the car's CoC, eg. 205/50R17 6.5Jx17 ET46 won't be listed in an Octavia MK3's CoC. Compared to 205/50R17 6.5Jx17 ET46 (not Skoda approved), 205/50R17 6Jx17 ET48 will give more protection against kerbing damage...because the tyre's sidewalls bulge out more from the rim. One non-standard option that could be used without snowchains is 215/50R17 6.5Jx17 ET46. This would give similar rim protection from kerbing damage as fitting a 205/50R17 to a 6" rim width...because the sidewalls in both cases bulge out a similar amount. 225/45R17 give the rims very little protection from kerbing damage, even if fitted to the narrower 7" rim width. For good protection from kerbing damage you need to look at 50 aspect ratio tyres or higher...fitted to relatively narrow rims. This is where 205/50R17 fitted to 6" rim width or 215/50R17 fitted to 6.5" rim width give a big advantage compared to 225/45R17 fitted to 7" rim width. 225/45R17 fitted to a wider 7.5" rim width gives even less protection from kerbing damage than a 225/45R17 fitted to a 7" rim width...b Michelin Alpin 7 215/50R17 95V XL (Euro label C B 71dB) (Winter tyre) (not a Skoda approved size, so might be illegal in Switzerland and other strict EU countries) https://www.mytyres.co.uk/rshop/tyre/Michelin/Alpin-7/215-50-R17-95V-XL/D-134881 The 205/55R17 tyre size in the below listing only applies to the Octavia MK3 Scout. Other Octavia MK3 models use a smaller outside diameter 205/50R17 tyre size...with this 6Jx17 ET48 rim specification. 6Jx17 ET48 5/112 57.1 alloy rim CRYSTAL 5E0071496A 8Z8 (204.34 Euros is about £177.37) https://www.skoda-parts.com/spare-part/5e0071496a8z8-aluminium-rim-17-crystal-skoda-43499.html 6.5Jx17 ET46 5/112 57.1 alloy rim LYRA 5E3071497AC 8Z8 (215.38 Euros is about £186.95) https://www.skoda-parts.com/spare-part/5e3071497ac8z8-aluminium-rim-17-lyra-skoda-41403.html The tyre size with the biggest outside on the Octavia MK3 RS is 225/35R19. As you can see in the chart below, the non-standard 215/50R17 has an outside diameter 1.0% bigger. As a general guide, up to 1.5% bigger outside diameter than standard is generally considered acceptable. For example, the speedometer is unlikely to under-read, and the gearing shouldn't feel much different to standard. Outside diameter of tyre 225/35R19 640.1mm 215/50R17 646.8mm (1.0% bigger outside diameter compared to 225/35R19)

The only 17" wheel sizes shown in the Octavia MK3 RS owner's manual that are suitable for snow chains are 205/50R17 6Jx17 ET45 and 205/50R17 6Jx17 ET48. The only other 17" wheels that are listed on the Octavia MK3 RS's CoC (Certificate of Conformity) are 225/45R17 7Jx17 ET49 and 225/45R17 7.5Jx17 ET51. 6.5Jx17 ET46 won't be listed on the CoC for any Octavia MK3...it's an Octavia MK4 rim size. The Octavia MK4 uses a 205/55R17 tyre size with this rim. Aftermarket alloy rims often come in sizes (rim width, offset, etc.) that aren't approved by Skoda...ie. they won't be listed on the car's CoC. 205/55R17 isn't approved by Skoda for any Octavia MK3 (including the RS), except for the Scout when fitted to a 6Jx17 ET48 rim. NX is a code for the Octavia MK4, not Octavia MK3.

The Skoda accessory catalogue lists 6Jx17 ET48 5/112 57.1 alloy rims for the Octavia MK3, which are suitable for use with 205/50R17 tyres. By quoting the relevant OEM part number, eg. 5E0071496A 8Z8, these can be ordered from any VAG parts department. 6Jx17 ET48 5/112 57.1 alloy rim CRYSTAL 5E0071496A 8Z8 (4869CZK about £174.37) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-crystal-17-octavia-iii/p/5E0071496A+8Z8 6Jx17 ET48 5/112 57.1 alloy rim CRYSTAL 5E0071497E FL8 (5119CZK about £183.33) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-crystal-17-octavia-iii/p/5E0071497E+FL8 Michelin Alpin 7 205/50R17 93V XL (Euro label C B 71dB) (Winter tyre) https://www.mytyres.co.uk/rshop/tyre/Michelin/Alpin-7/205-50-R17-93V-XL/D-134906

As you can see in the chart below, 235/40R19 fitted to an 8.5" rim width is 17mm wider than a 225/40R19 fitted to a 7.5" rim width. However, the ET43 reduces the offset by 5mm compared to the ET48 which means that the standard 19" wheels on the Octavia MK4 need at least 13.5mm of clearance on the outside and at least 3.5mm of clearance on the inside for no rubbing to occur with the 235/40R19 8.5Jx19 ET43 wheel. If 15mm wheel spacers can be used with the standard 19" wheels without rubbing, I expect 235/40R19 8.5Jx19 ET43 wheels without wheel spacers can also be used without rubbing. Fitting 235/40R19 to slightly narrower 8.0" rims would help the clearances...so perhaps first try 235/40R19 8Jx19 ET44 wheels from the Superb MK3/MK4. Actual inflated width of tyres (measured from sidewall to sidewall, at the widest point) 225/40R19 fitted to 7.5" rim 224mm 235/40R19 fitted to 8.0" rim 235mm 235/40R19 fitted to 8.5" rim 241mm 245/40R19 fitted to 8.0" rim 242mm Outside diameter of tyres 225/40R19 662.6mm 235/40R19 670.6mm (1.2% bigger outside diameter compared to 225/40R19) 245/40R19 678.6mm (2.4% bigger outside diameter compared to 225/40R19) ETRTO approved rim widths for passenger car tyres 225/45 7.0-7.5-8.5 235/45 7.5-8.0-9.0 245/45 7.5-8.0-9.0 225/40 7.5-8.0-9.0 235/40 8.0-8.5-9.5 245/40 8.0-8.5-9.5 245/40R19 8Jx19 ET44 wheels fitted to Superb MK3 (lowered and with wheel spacers)

That should read, "The inflated 135/80R18 will be about 7mm wider than the inflated 125/70R18...".

The sidewall height of 135/80R18 is 20.5mm higher than 125/70R18, so there would need to be a gap of at least 20.5mm around the 125/70R18 for the 135/80R18 to fit. The inflated 125/70R18 will be about 7mm wider than the inflated 135/80R18 when fitted to the same 3.5Jx18 ET25.5 5/112 57.1 space saver steel rim...not the nominal 10mm. The width of an inflated tyre is measured from sidewall to sidewall, at the widest point.

The skoda-parts dot com front shock aborbers are listed against both 5Q0413031LH and 5Q0413031FP. Bilstein B4 22-230539 is also listed against 5Q0413031FP and about 30 other OEM part numbers, so that's another possibility. The genuine Skoda part should be near enough an exact match to what the car left the factory with. Aftermarket shock aborbers won't often be close to an exact match to the factory fitted shock absorbers because of the large number of OEM part numbers that they are sold to replace.

One option to give a slightly firmer ride is to go up one in the hierarchy from 5Q0411105GM front springs and 3Q0511115AL rear springs to 5Q0411105GN front springs and 3Q0511115M rear springs. As you can see below, this will increase the wire diameter of the front and rear springs by 0.25mm...which should give about a 5% increase in stiffness. Build codes G04+L07 = 5Q0411105GM front springs 1JP+0YE = 3Q0511115AL rear springs Wire diameter of front springs 5Q0411105GM 12.25mm 5Q0411105GN 12.50mm Wire diameter of rear springs 3Q0511115AL 12.50mm 3Q0511115M 12.75mm Bilstein 37-293123 front springs (matches 5Q0411105GN) https://www.autodoc.co.uk/car-parts/oem/5q0411105gn?supplier%5B%5D=16 Bilstein 36-301959 rear springs (matches 3Q0511115M) https://www.autodoc.co.uk/car-parts/oem/3q0511115m?supplier%5B%5D=16

If the Superb MK3 2.0TSI 272PS/280PS hatchback has standard ride height (not lowered ride height or increased ride height) then the OEM part number for the rear springs might be 3Q0511115AL. Checking the car's build codes is one way to check what rear springs were fitted in the factory. Kilen and Lesjofors are the biggest aftermarket manufacturer of car springs in Europe and are made in a modern factory in Sweden. These two brands are the same spring. Kilen tends to be more widely marketed in the UK whereas Lesjofors tends to be more widely marketed in some European countries such as Germany. Kilen rear springs (matches 3Q0511115AL) https://www.ebay.co.uk/itm/277418047619

Dropping 1" in rim diameter to the 235/50R18 7Jx18 ET43 wheels would have improved the ride a lot. The difference in ride between the other sizes is incremental. Often with VAG cars, going for the most extreme wheel option can cause the ride quality to drop off a cliff. Tiguan MK1 wheels 215/65R16 6.5Jx16 ET33 215/60R17 6.5Jx17 ET33 235/55R17 7Jx17 ET43 235/50R18 7Jx18 ET43 255/40R19 9Jx19 ET33

Like the Yeti, the Karoq FWD uses 215/60R16 for its 16" tyre size. However, the Karoq FWD uses 215/55R17 for its 17" tyre size instead of the Yeti's 225/50R17. Interestingly, both the Karoq FWD and Yeti use the same 17" rim specification, ie. 7Jx17 ET45. So one possibility for a better ride is to fit 215/55R17 instead of 225/50R17...if the insurance company doesn't mind. 215/55R17 has the same load index as 225/50R17...so the same tyre pressures can be used. Example of good 215/55R17 all-season tyre https://www.camskill.co.uk/m140b0s8825p220589/Continental_Tyres_All_Season_Car_Continental_Conti_All_Season_Contact_2_215_55_R17_94V_TL_Fuel_Eff_%3A_B_Wet_Grip%3A_B_NoiseClass%3A_B_Noise%3A_70dB As you can see in the chart below, the 215/55R17 is the second most comfortable tyre size out of the four standard Karoq FWD tyre sizes. The ride comfort of 225/50R17 is similar to 215/50R18...and it would be easy to feel the improvement of 215/55R17 compared to either of these two tyre sizes. When it comes to ride comfort, the 225/40R19 is a truly dreadful tyre...and is by far the worst out of the four tyre sizes shown in the chart below. Karoq FWD tyre sizes 215/60R16 215/55R17 215/50R18 225/40R19

The Superb MK2 needs 5/112 57.1 rims. Are these new rims 6.5Jx17 ET39 5/100 57.1? If so, 5/100 is incorrect and won't fit because you won't physically be able to insert the wheel bolts...due to the holes in the rims being in the wrong place. Do the 205/50R17 tyres have a load index of 89(580kg) or 93(650kg)? If only 89(580kg) they probably won't be able to support the maximum axle weight of the Superb MK2. The Superb MK2 usually needs tyres with a load index of at least 91(615kg) or 92(630kg)...depending on model. The Superb MK2 normally uses rims with an offset between ET45 and ET50...so ET39 is 6mm outside of this range. 205/55R16 is a much cheaper (and more comfortable) tyre size than 205/50R17, so it might be better to look at this tyre size (with suitable rims) instead of 205/50R17. The Superb MK2 3.6 V6 needs at least 17" rims to clear the front brake calipers, but all other models can use 16" rims.

235/35R20 might not be able to support the maximum axle weight of the Superb MK3 because the load index of this tyre size is only 92(630kg) in XL (eXtra Load) form. The Superb MK3 usually uses at least a 94 (670kg) load index. 245/35R20 would have been better because that has a load index of 95(690kg) in XL form.

According to Jurid/Ferodo/Valeo on autodoc, the Superb MK3 1.4TSI iV 160kW/218PS has 312x25mm front brake discs and 300x12mm rear brake discs. All Superb MK3 models use the 312x25mm front and 300x12mm rear brake disc combination except for the powerful 2.0TSI 272/280PS 4x4 models which use the bigger 340x30mm front and 310x22mm rear brake disc combination. The 312x25mm front brake discs could be upgraded to 314x30mm from the Kodiaq. The Kodiaq uses these 314x30mm front brakes discs in combination with the 300x12mm rear brake discs. The 314x30mm front brake discs use the same front brake calipers as the 340x30mm front brake discs. 314x30mm front brake discs enable the use of 16" wheels, whereas the bigger 340x30mm front brake discs need at least 17" wheels to clear the front brake calipers. One owner reported that the 310x22mm rear brakes also need at least 17" wheels to clear the rear brake calipers. The increase in piston diameter of the front brake calipers when going from 312x25mm front brake calipers to 314x30mm/340x30mm front brake calipers will increase the pressure applied to the front brake pads by 10.8%, ie. (60/57)x(60/57)=1.108033241 The increase in the surface area of the front brake pads when going from 312x25mm front brake calipers to 314x30mm/340x30mm front brake calipers is about 18.2% (estimate only as based on outside lengths and outside heights of front brake pads), ie. (175.2/160.2)x(69.7/64.5)=1.1818018175 314x30mm/340x30mm front brake discs have more effective cooling than 312x25mm front brake discs. The performance of the 314x30mm front brakes is probably closer to the 340x30mm front brakes than the 312x25mm front brakes. On the Superb MK3, all the master cylinders use a 23.8mm (15/16"=23.8mm) bore for both the 312x25mm/300x12mm and 340x30mm/310x22mm brake disc combinations. Piston diameter 312x25mm front brake caliper 57mm 314x30mm/340x30mm front brake caliper 60mm 314x30mm front brake discs (Kodiaq build code 1LW) (TRW brake calipers) Left caliper 3C0615123 Right caliper 3C0615124 Left carrier 7N0615125 Right carrier 7N0615126 Disc 1K0615301AJ Brake pads 8V0698151C https://www.lllparts.co.uk/catalogs/skoda/CZ/KOD/804/6/615/615010 312x25mm front brake discs 8.6kg 314x30mm front brake discs 9.4kg 340x30mm front brake discs 10.8kg Front brake pads for 312x25mm front brake discs Front brake pads for 314x30mm/340x30mm front brake discs

On the Superb MK3, non-standard 225/50R18 7Jx18 ET43 5/112 57.1 wheels could be used with 10mm spacers. This will change the effective offset of the rims from ET43 to ET33. Make sure the spacers are hubcentric, so that the wheel is centred on the hub. With 10mm spacers, the wheel bolts need to be 10mm longer. Perhaps look at Eibach spacers and wheel bolts. The standard WHT001812 wheel bolts have a specification of M14x1.5x27 Eibach M14x1.5x27 wheel bolt S1-6-14-50-27-17 (standard length) https://www.autodoc.co.uk/eibach/1931742 Eibach M14x1.5x37 wheel bolt S1-6-14-50-37-17 (10mm longer than standard length) https://www.autodoc.co.uk/eibach/15258679?search=EIBACH+Wheel+Bolt+%28S1-6-14-50-37-17%29 Eibach 10mm wheel spacers S90-2-10-027 (5/112 57.1) https://www.autodoc.co.uk/eibach/1931843?search=EIBACH+Wheel+spacer+%28S90-2-10-027%29

The below Bilstein B4 shock absorbers for the Superb MK2 are for standard ride height, ie. not lowered ride height or increased ride height. Front shock absorbers (standard ride height) (2014 Superb MK2 estate 4x4) 3C0413031AQ G02 3AA413031M G07 3C0413031AT G07 3C0413031AS G15 3C0413031AB G52 Rear shock absorbers (standard ride height) (2014 Superb MK2 estate 4x4) 3C0513049AR 1JA+1X1 Bilstein B4 22-151056 front shock absorbers (standard ride height) (sold to replace 3C0413031AQ, 3AA413031M, 3C0413031AT, 3C0413031AS, 3C0413031AB) https://www.autodoc.co.uk/bilstein/632208 Bilstein B4 19-151069 rear shock absorbers (standard ride height) (sold to replace 3C0513049AR) https://www.autodoc.co.uk/bilstein/631759 The white label in the boot only has about 40 of the car's build codes, whereas the car might have around 180 build codes. There's a seller on ebay that can supply all of the car's build codes for 3 Euros (about £2.61). Search "skoda vin decoder" on ebay to find a seller that can supply the car's build codes https://www.ebay.co.uk/itm/226517872578 VW Code Decoder 1JA=standard ride height 1X1=4x4 https://igorweb.org/equidec.aspx

The below information is extracted from the Superb MK3 and Superb MK4 owners' manuals. The offset ranges of -2mm to +2mm that wheel-size.com show on their website appear to be arbitrary numbers plucked out of thin air, so probably best ignored. Some countries in Europe (such as Germany) don't allow you to use a wheel size that's not in the car's CoC (Certificate of Conformity). However, if legalities and insurance allow you might want to also look at the winter wheel sizes (ie. suitable for snow chains) that the Superb MK3 lists in its owner's manual...ie. 215/60R16 6.5Jx16 ET41 and 215/55R17 6.5Jx17 ET41. Bear in mind, that the Superb MK4 does use an ET41 offset with its 215/55R17 7.5Jx17 ET41 wheel size. Technical data and specifications (Superb MK3) Permitted rim and tyre combinations for mounting snow chains: Rim dimensions Tyre dimensions 6,5Jx16 ET41 215/60 R16 6,5Jx17 ET41 215/55 R17 Only use snow chains with links no larger than 13 mm, including locks. Technical data and specifications (Superb MK4) Permitted rim and tyre combinations for mounting snow chains: Rim dimensions Tyre dimensions 7J×16 ET43 215/60 R16 7J×17 ET43 215/55 R17 Only use snow chains with links no larger than 13 mm, including locks.