Carlston

For the Octavia MK2 1.9TDI 105HP estate (manual or automatic) Bilstein supply the following B4 and B6 shock absorbers for standard ride height springs and lowered ride height springs. Bilstein also supply these for the Octavia MK2 VRS. With these two Bilstein shock absorbers, there is no distinction between standard ride height springs and lowered ride height springs. Bilstein B4 22-183729 and Bilstein B6 35-108177 front shock absorbers (both have 55mm struts) https://www.autodoc.co.uk/car-parts/oem/1t0413031hn?search=OEN 1T0413031HN&supplier[0]=16 The below information shows that the above two Bilstein front shock absorbers (ie. Bilstein B4 22-183729 and Bilstein B6 35-108177) will be suitable, as you can see in the Bilstein listings on autodoc that they are both sold to replace OEM part numbers 1T0413031HN, 1T0413031HM, and 1T0413031HP (and many other OEM part numbers). Both these two Bilstein front shock absorbers are also suitable for the Octavia MK2 VRS, because the relevant OEM part numbers are listed against them. 1T0413031HN Front shock absorber for standard ride height 1K0411105AQ Standard ride height front coil spring L07 (manual gearbox) 1T0413031HM Front shock absorber for standard ride height L13,L14 11K0411105BC Standard ride height front coil spring L13 (automatic gearbox) 11K0411105BD Standard ride height front coil spring L14 (automatic gearbox) 1T0413031HP Front shock absorber for lowered ride height L55,L58 1K0411105DA Lowered ride height front coil spring L55 (manual gearbox) 1K0411105DB Lowered ride height front coil spring L58 (automatic gearbox)

If only he had changed to the standard 225/50R17 to 235/55R17 like this fella, he probably wouldn't have damaged his rim. Top photo 225/50R17, bottom photo 235/55R17 As you can see in the chart below, 235/55R17 has a sidewall height of over 5". Sidewall height 225/50 4.4" 215/55 4.7" 225/55 4.9" 235/55 5.1" 215/60 5.1" 225/60 5.3" 235/60 5.6" 205/65 5.2" 215/65 5.5" 205/70 5.6" 215/70 5.9" 195/80 6.1" I would replace that damaged 7Jx17 ET45 5/112 57.1 alloy rim, rather than trying to repair it. Risking sudden and catastrophic failure just isn't worth it. Perhaps look at a set of 215/60R16 fitted to 6Jx16 ET43 rims, which is a standard Karoq size. That should help prevent the same thing happening again, or at least make it far less likely.

What tyre sizes are you interested in? Eleven possible tyre sizes 165/65R15 175/60R15 175/65R15 185/55R15 185/60R15 185/65R15 195/50R15 195/55R15 195/60R15 205/50R15 205/55R15 What specification rims are you interested in? Eight possible rim specifications 5Jx15 ET28 6Jx15 ET29 5.5Jx15 ET34 6.5Jx15 ET34 6Jx15 ET35 6Jx15 ET38 5.5Jx15 ET40 6Jx15 ET43

Yes, the 245HP engine is from the Octavia MK3 VRS, but I expect a remapped Superb MK3 2.0TSI 220HP engine would produce similar but not identical characteristics to the remapped 245HP engine. I don't see why the remapped 280HP engine needs to produce less torque between 2,000rpm and 2,750rpm than the standard 280HP engine. You can easily see this by comparing the torque curves at those engine speeds, in your graph. Once in the powerband, there's no doubt that the remapped 280HP engine is very powerful, and the way it holds onto its power higher up in the rev range is quite impressive...especially compared to the remapped 245HP engine. It would be interesting to see the power and torque curves of a remapped 2.0TSI 190HP engine. These only remap to around 235HP, but I expect peak torque would come in at lower revs than the more powerful cars with bigger turbos. Someone did post about a remapped Karoq 2.0TSI 190HP 4x4 that did 0-60mph (0-100km/h) in around 6.3-6.7 seconds. So at high revs, a lot slower than a remapped 280HP 4x4, but I expect more power low down in the rev range, and therefore better top gear flexibility.

You can see from the remapped 280HP engine's torque curve that peak torque occurs from around 3,300rpm. Hence, there would be no point launching with more revs. Launching from an unnecessarily high 4,000rpm would pointlessly fry the clutch. It doesn't look like a very good remap from a top gear flexibility point of view, at normal road speeds. In top gear, it looks like the remapped 280HP engine is losing a considerable amount of power and torque between 90km/h (56mph) and 120km/h (75mph) compared to the standard 280HP engine (perhaps 10% less at some points). In top gear the remapped 280HP engine won't start to produce peak torque until 150km/h (93mph). The remapped 245HP engine also didn't enter its power band until ridiculously high speeds in top gear. However, compared to a remapped 245HP engine, the remapped 280HP engine is worth revving out to the red line, for maximum acceleration. With the remapped 245HP engine the power peaked at about 4,500rpm. So revving the remapped 245HP engine out past around 5,250rpm was pointless, even though the red line was about 6,300rpm.

There are two main issues to consider, clearance and gearing. However, if you don't want to read the rest of this post I would give both the clearance and gearing consideration an ok for fitting either 225/45R19 or 245/40R19 to a Karoq two wheel drive on the standard 8Jx19 ET45 rims. Bear in mind that the wider 245/40R19 should protect the 8Jx19 ET45 rims a lot better from kerbing damage than the 225/40R19. So that would probably be the better choice, unless everyone who driver the car is an expert at avoiding coming into contact with the kerb. It should be realised that comfort is always relative, and even the slightly higher sidewalled 225/45R19 and 245/40R19 tyre sizes aren't going to match the comfort of even a 215/50R18 tyre size fitted to the standard 7Jx18 ET45 rim. However, I'm sure you will notice the improvement in ride comfort compared to the 225/40R19 tyre size...although you would need to drop the tyre pressures slightly to get the full benefit...as these bigger sidewalled tyres have higher load indexes and can therefore support the same load using less air pressure. It should also be realised that the bigger diameter tyres are often a lot more expensive than the smaller diameter tyres. The price of tyres can drop a lot even by going down just 1" from 19" to 18". For example, here's a mid-range Kumho summer tyre in the 215/50R18 size. It doesn't have an excessively high V, W, Y, speed rating (for a car that doesn't go over 130mph) and it isn't XL, so the sidewalls should flex more easily and therefore the tyre should be more comfortable than an over-specified tyre in the same tyre size. Kumho ES31 Ecowing 215/50R18 92H (Euro label 71dB) https://www.camskill.co.uk/m61b0s3736p187896/Kumho_Tyres_Car_Kumho_ES31_Ecowing_Kumho_ES_31_215_50_R18_92H_TL_Fuel_Eff_%3A_C_Wet_Grip%3A_B_NoiseClass%3A_B_Noise%3A_71dB Comparing the 225/45R19 and the 245/40R19 when fitting to the 8J rim, the wider 245/40R19 is going to give the best protection from kerbing damage. On your current 8Jx19 ET45 rims, the Karoq front wheel drive cars leave the factory with either 225/40R19 or 235/40R19 tyres. On your current 8Jx19 ET45 rims, the Karoq 4x4 cars leave the factory with either 225/45R19 or 245/40R19 tyres. Therefore, I doubt fitting either of the two Karoq 4x4 tyre sizes to your rims is going to cause a problem with clearance. Both of the Karoq 4x4 tyre sizes will raise the gearing slightly, but the 1.5TSI engine has good low down torque (ie. pulling power), so I doubt you will have problems with the car being able to pull the slightly higher gear. As you can see in the chart below, 225/45R19 has an outside diameter 1.9% bigger than 215/50R19, and 245/40R19 has an outside diameter 1.0% bigger than 215/50R19. 1.5% to 2.0% is often considered a small increase is gearing, so the new slightly higher gearing shouldn't cause any problems with the car's engine being able to comfortably pull the new slightly higher gears. Outside diameter of tyres 215/50R18 672.2mm 225/45R19 685.1mm (+1.9%) 245/40R19 678.6mm (+1.0%)

The tyre pressures shown on your fuel filler flap go up to 3.2Bar (46psi) for the rear tyres when there's a full load. Did you fit the 205/55R16 91H (standard load) or 205/55R16 94V (extra load) Bridgestone A005 tyres? The maximum tyre pressure for the standard load tyres is 3Bar (44psi), unless it says differently on the sidewall. The maximum tyre pressure for the extra load tyres is 3.5Bar (51psi), unless it says differently on the sidewall. Don't inflate a tyre to more than the maximum, as shown on the tyre's sidewall. If you are lightly loaded, you only need to use the 2.1Bar (30psi) front and rear tyre pressures, as shown on the inside of your fuel filler flap. Tyre pressures make a lot of difference to ride comfort. It's easy to notice the harder ride caused by overinflating the tyres by just 3psi, so overinflating the front tyres by 7psi and the rear tyres by 5psi will make the ride a lot harder. I never use ECO tyre pressures, because i get fantastic fuel economy by driving sensibly and I don't like to compromise my ride quality. Plus, I have tested at higher tyre pressures, but the difference is so small I've never noticed the difference. If you are experiencing a hard and uncomfortable ride you might be more tempted to drive faster in order to get the journey over as quickly as possible. Therefore, using comfort tyre pressures can actually improve your mpg. If you are still finding your ride hard, maybe someone has fitted incorrect springs and/or shock absorbers. It happens a lot with garages, as they have no interest in spending the time it takes to carefully select the correct parts. So you may find that someone has fitted heavy-duty springs and/or shock absorbers. One relatively easy check you can make with your front and rear springs, is to measure the wire diameter. If the wire diameter of the front and rear springs is more than shown in the chart below, you might want to carry out further more detailed checks. Even 0.25mm more than what's shown below would have me carrying out further checks. Wire Diameter of Springs for Octavia MK3 1.0TSI hatchback with standard ride height Front spring wire diameter 11.5mm Rear spring wire diameter 10.75mm Although 205/55R16 aren't as good for ride comfort as 195/65R15, they are way better than the various 225 offerings such as 225/45R17, 225/40R18, and 225/35R19. You do have the option of changing to 6J rims instead of 6.5J rims. On the Octavia MK3, the 205/55R16 tyre size is normally fitted to 6.5Jx16 ET46 rims. However, using 0.5" narrower 6J rims such as 6Jx16 ET43 (non-standard, ie. from the Karoq) or 6Jx16 ET48 (standard Octavia MK3 winter tyre size) would help improve the ride comfort a little more. It's not a massive difference, but it should be enough to notice. Other options, include changing to 205/60R16 instead of the standard 205/55R16. 205/60R16 is used on the latest Octavia MK4 instead of the earlier 205/55R16 tyre size that was used on the Octavia MK3. However, 205/60R16 would raise the gearing by about 3.2% and is a more expensive tyre size compared to 205/55R16. As you can see in the link below, the Vredestein Quatrac 205/60R16 96H XL is quite a bit cheaper than many of the other big brand all-season tyres in this size. Vredestein Quatrac 205/60R16 96H XL https://www.camskill.co.uk/m139b0s8005p201101/Vredestein_Tyres_All_Season_Car_Vredestein_Quatrac_6_205_60_R16_96H_XL_TL_Fuel_Eff_%3A_C_Wet_Grip%3A_B_NoiseClass%3A_B_Noise%3A_70dB

The below information is for a Karoq owner who wants more comfort from their 19" wheels (and doesn't want to change to smaller diameter rims), but would prefer 225/45R19 rather than the wide 245/40R19 tyre size. If you are purchasing four new tyres, it might not work out any more expensive to sell the current 8Jx19 ET45 Karoq rims with tyres and change to new 7Jx19 ET43 Kodiaq rims, and fit 225/45R19 for a much improved ride compared to 225/40R19 or 235/40R19 tyres fitted to 8Jx19 ET45 rims. The reason being is that the four 19" Karoq wheels appear to have a secondhand value of almost £1,000 if they are in excellent condition with tyres. There's a scuffed set currently being listed on ebay for about £800, and a refurbished set without tyres for about £950 plus shipping. The idea of the narrower 7Jx19 ET43 Kodiaq rims, is that this would be ideal for 225/45R19 tyres. Many of the Octavia MK3 225/45 tyres (albeit 17" due to the smaller outside diameter of Octavia MK3 tyres) were also fitted to 7J rims (and sometimes 7.5J rims) out of the factory...so it's not unusual for a 225/45 tyre to be fitted to a 7J rim. The 225/45R19 would give more mpg than 245/40R19. The appearance of the two different specification CRATER alloy rims appears to be the same. 7Jx19 ET43 5/112 57.1 CRATER alloy rims (from the Kodiaq) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-crater-19-kodiaq/p/565071499H+8Z8 8Jx19 ET45 5/112 57.1 CRATER alloy rims (from the Karoq) https://eshop.skoda-auto.cz/cs_CZ/alu-kolo-crater-19-karoq/p/57A071499A+8Z8

I would go with ATE brake discs, rather than TRW ones as they are probably better quality. Here's a complete list of TRW brake pads and ATE brake discs for the Octavia MK3 Octavia MK3 Brake Pads and Brake Discs TRW Front Brake Pads 1ZF 276mm TRW GDB2080 1ZE 288mm TRW GDB1956 1ZA 312mm TRW GDB1956 1ZB 312mm TRW GDB1956 1LG 340mm TRW GDB2114 TRW Rear Brake Pads 1KD 253mm TRW GDB1330 1KS 272mm TRW GDB2042 1KT 272mm TRW GDB2042 1KW 310mm TRW GDB1622 ATE Front Brake Discs 1ZF 276mm ATE 24012402581 1ZE 288mm ATE 24012501451 1ZA 312mm ATE 24012501581 1ZB 312mm ATE 24012501581 1LG 340mm ATE 24013002251 ATE Rear Brake Discs 1KD 253mm ATE 24011004201 1KS 272mm ATE 24011003561 1KW 310mm ATE 24012202191

Both 225/45R19 and 245/40R19 have more sidewall than 225/40R19, but with the standard 8Jx19 rim, the wider 245/40R19 is going to offer better protection to the edges of the alloy rims from kerbing damage than the narrower 225/45R19. When looking at alternative tyre sizes for the Karoq, the following "ETRTO approved rim widths" chart might help (at the bottom of this post). With the 16" Karoq wheels, there's also a lot of non-standard slightly oversize tyres that could be considered, including 215/65R16, 225/60R16, 235/60R16. I quite like the 235/60R16 option because as well as offering a big chunky off-road look and comfortable and well cushioned ride, it's a cheap tyre size. In the UK, there are good 235/60R16 tyres available for under £100 each. Someone fitted similar outside diameter 235/55R17 tyres to their Yeti, as shown in one of the photos below. There's also 17" options to consider. There's a 6.5Jx17 ET38 5/112 57.1 steel rim (at least one alloy rim is also available in this size) from the Kodiaq that could be used with 215/60R17 tyres on the Karoq. Yokohama G015 Geolander AT (All-Terrain) 215/65R16 98H https://www.camskill.co.uk/m62b0s426p148189/Yokohama_Tyres_Car_Yokohama_G015_Geolander_AT_Yokohama_G_015_215_65_R16_98H_TL_Fuel_Eff_%3A_E_Wet_Grip%3A_C_NoiseClass%3A_B_Noise%3A_70dB Yokohama G015 Geolander AT (All-Terrain) 215/60R16 96H https://www.camskill.co.uk/m54b0s3735p164247/Yokohama_Tyres_Car_Yokohama_G015_Geolander_AT_Yokohama_G_015_215_60_R17_96H_TL_Fuel_Eff_%3A_E_Wet_Grip%3A_C_NoiseClass%3A_B_Noise%3A_71dB Yokohama G015 Geolander AT (All-Terrain) 235/60R16 100H https://www.camskill.co.uk/m62b0s425p148190/Yokohama_Tyres_Car_Yokohama_G015_Geolander_AT_Yokohama_G_015_235_60_R16_100H_TL_Fuel_Eff_%3A_E_Wet_Grip%3A_C_NoiseClass%3A_B_Noise%3A_72dB Top photo shows Yeti with 225/50R17 tyres, bottom photo shows Yeti with 235/55R17 tyres (about 5% increase in outside diameter) ETRTO approved rim widths 195/65 5.5-6.0-7.0 205/65 5.5-6.0-7.5 215/65 6.0-6.5-7.5 215/60 6.0-6.5-7.5 225/60 6.0-6.5-8.0 235/60 6.5-7.0-8.5 215/55 6.0-7.0-7.5 225/55 6.0-7.0-8.0 235/55 6.5-7.5-8.5 215/50 6.0-7.0-7.5 225/50 6.0-7.0-8.0 235/50 6.5-7.5-8.5 225/45 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

Kilen springs are about £40 each, so they're probably worth changing as well as the shock absorbers considering the 90K miles. Does the unladen ride height look like it's sagging? Kilen lists the following springs, but it's worth checking the OEM part numbers of the original springs to see if they match. For example, instead of 5Q0411105GM your original front springs might be 5Q0411105GN if you have DSG instead of a manual gearbox. Kilen springs (for Superb MK3 estate 2.0TDI 150HP front wheel drive with standard ride height and without towbar) Kilen 25117 front springs 5Q0411105GM Kilen 65124 rear springs 3Q0511115AK

6.5Jx16 ET50 5/112 57.1 alloy rim It's the usual 16" rim specification that is fitted to the VW Golf MK5/6 and various clones such as Octavia MK2, etc.

From the Skoda Scala parts catalogue, there are three possible steel rims available for use as a spare wheel. 195/65R15 would fit the 6Jx15 ET35 5/100 57.1 steel rim, 195/60R16 would fit the 6Jx16 ET35 5/100 57.1 steel rim, and 125/70R18 would fit the 3.5Jx18 ET38 5/100 57.1 steel rim. Skoda Scala parts catalogue (showing spare wheels) No Part code Title Note Quantity Model Steel rim (for spare wheel only) --------------------------- 1 2Q0601027AE 03C Steel rim 6Jx16 ET35 1 PR-1G1+K8G rally black 1 2Q0601027AB 03C Steel rim 6Jx15 ET35 1 PR-1G1+K8R rally black 1 1J0601027M 03C Steel rim for space-saving emergency wheel 3.5Jx18 ET38 5/100 1 PR-1G9 rally black https://www.lllparts.co.uk/catalogs/skoda/CZ/SCA/584/6/601/601012 195/60R16 fitted to 6Jx16 ET35 5/100 57.1 steel rim https://eshop.skoda-auto.cz/cs_CZ/kompletni-rezervni-kolo-16/p/658601011

The VRS normally comes with lowered ride height, aka sports suspension...as standard...so not to be cofused with standard ride height. When you order a new VRS, you can sometimes tick a standard ride height box, if you don't want the lowered/sports suspension. If you input the 1JE build code into the "VW Codes Decoder", you will see that it means sports suspension, ie. lowered ride height. VW Codes Decoder 1JE = Rear sports shock absorption http://igorweb.org/equidec.aspx Apart from Bilstein B8, I suspect most other aftermarket shock absorbers for the Octavia MK3 are made for standard ride height...although many of these will also be sold for lowered suspension...as in you can bolt them on and it will pass an MOT. Note that the VRS has multi-link rear suspension, like the 4WD models. Lesser models don't have multi-link rear suspension. Cars with multi-link rear suspension use different rear shock absorbers.

It actually saves only 7mm, if comparing the 195/65R15 fitted to a 6J rim with a 205/55R17 fitted to a 6J rim. This is because the actual inflated width of a 195/65R15 tyre fitted to a 6J rim is 201mm, and the actual inflated width of a 205/55R16 tyre fitted to a 6J rim is 208mm. However, if comparing the 195/65R15 fitted to a 6J rim with a 205/50R17 fitted to a 6.5J rim the saving is 13mm. Actual inflated width of tyres 195/65R15 fitted to 6J rim 201mm 205/55R16 fitted to 6J rim 208mm 205/50R17 fitted to 6.5J rim 214mm

Aftermarket shock absorbers are mainly aimed at standard ride height. Hence, a lack of Bilstein and Sachs rear shock absorbers that closely match 5Q0513029KF. Bilstein B4 19-230559 could probably be used, but looking at some of the OEM part numbers that it is sold to replace it's not specific to lowered ride height cars. In fact, it's sold for increased ride height cars, standard ride height cars, and lowered ride height cars. I can't see OEM part numbers from the Octavia MK3 listed against it, but many OEM part numbers from the Golf MK7 are listed against it. If it was me, I would look at the Bilstein B8. This is specifically made for lowered ride height cars. Some say you really need a drop of 30mm to 40mm for the Bilstein B8 to work, but I did look recently at the difference in the uncompressed lengths of some standard ride height springs and some lowered ride height springs, and the difference was about 36mm to 41mm. So I doubt you would have a problem using Bilstein B8 shock absorbers with lowered ride height Skoda springs. In the worst case scenario, you would simply have to purchase some Eibach pro-kit springs or something similar to go with the Bilstein B8 shock absorbers, but I doubt that would be necessary. Skoda parts catalogue 7 5Q0513029FL Rear shock absorber for vehicles with sports suspension D >> - 05.10.2015 rear 2 PR-1JE+1X0 K8D RS 7 5Q0513029KF Rear shock absorber for vehicles with sports suspension D - 05.10.2015>> rear 2 PR-1JE+1X0 K8D https://www.lllparts.co.uk/catalogs/skoda/CZ/OCT/753/5/511/511003 Bilstein B8 24-229937 rear shock absorbers on autodoc.co.uk Today (Tuesday, 30 May 2023), these Bilstein B8 24-229937 rear shock absorbers are listed on autodoc at £108.69 each (it's a 35% off day). https://www.autodoc.co.uk/bilstein/7522727 Bilstein B8 24-229937 rear shock absorbers on ebay.de https://www.ebay.de/itm/185868995039

The Euro label isn't for wet grip, it's for wet braking. In tyre reviews, they test both wet braking and wet handling...two different categories.

If it's the Primacy 4 (S1) version, you might be better off going for the standard Primacy 4+ C A version. The reason being, that the (S1) version is manufacturer specific (S1=Peugeot), and with tyres you don't get a free lunch. Hence compromises will have been made to the tyre such as much reduced tread life and/or other characteristics adversely affected. Bear in mind that the Primacy 4+ model is newer than the Primacy 4. S1 This code stands for the original equipment on Peugeot models. These kind of tyres have been developed and manufactured according to certain specifications and requirements of the car manufacturer. We recommend fitting four of the same tyres, so that the tyres can deliver optimal performance. Please note: The tyres can also be used on other vehicles. Michelin Primacy 4 (S1) 225/40R18 92Y XL (Euro label A A 70dB) https://www.blackcircles.com/catalogue/michelin/primacy-4-s1/225/40/R18/Y/92/m?tyre=41395622 Michelin Primacy 4+ 225/40R18 92Y XL (Euro label C A 70dB) https://www.blackcircles.com/catalogue/michelin/primacy-4-plus/225/40/R18/Y/92/m?tyre=42941961

Using the OEM part number from the accessory catalogue can be cheaper than using the factory OEM part number. This is because the accessory catalogue prices try to compete with the prices of aftermarket alloy rims. Check that your current rims have colour code 8Z8 cast into them on the back. This is because the CRATER 8Jx19 ET45 alloy rim comes in other colours such as anthracite, which would have a different colour code cast into them on the back. OEM part number for factory CRATER 8Jx19 ET45 5/112 57.1 alloy rims with colour code 8Z8 (silver) 57A601025G 8Z8 OEM part number for accessory catalogue CRATER 8Jx19 ET45 5/112 57.1 alloy rims with colour code 8Z8 (silver) 57A071499A 8Z8 skoda parts com https://www.skoda-parts.com/spare-part/57a071499a8z8-aluminium-rim-19-crater-skoda-31823.html

The first part of dealing with a slow air leak is to find where the air is leaking from, by first removing the wheel from the car and submerging it in water to check for air bubbles. If it's a very slow air leak the forming of bubbles will be quite slow. When you find the air leak, it's important to mark both the rim and tyre where the air leak is coming from. This is because you can't be sure if the air leak is caused by a problem with the rim or the tyre. Usually it's the rim that causes the slow air leak, but I have seen tyre beads crack quite badly. So it's also possible that a faulty tyre could cause a slow air leak. You could also take a photo of where the air leak is coming from.

The Scala owner's manual lists both 195/65R15 fitted to 6Jx15 ET35 and 195/60R16 fitted to 6Jx16 ET35 as winter tyre and rim combinations compatible with snow chains. 195/65R15 and 195/60R16 are both full size tyres and are not space saver tyres. 125/70R18 is an example of a space saver tyre. A space saver tyre can be inflated to a much higher pressure than a full size tyre, such as 4.2Bar (60psi). Extract from Scala owner's manual Permitted rim and tyre combinations for mounting snow chains: Rim dimensions Tyre dimensions 6Jx15 ET35 195/65R15 6Jx16 ET35 195/60R16 Only use snow chains with links no larger than 13 mm, including locks. https://digital-manual.skoda-auto.com/w/en_GB/show/7a72f0cf52cfcf9149e9fb127ad26818_11_en_GB?ct=7a72f0cf52cfcf9149e9fb127ad26818_11_en_GB

I'm not suggesting that the OP purchase four new tyres and rims. I have simply pointed out that due to having an expensive wheel size, ie. 215/45R16, fixing the problem won't be as cheap as it might otherwise have been if a less expensive wheel size had been used.

The OP may need to purchase a new rim if that's what is causing the slow air leak, ie. a damaged or corroded bead area on the rim. However, as you can see below, the 16" option is far more expensive than the 15" option. The speed of the air leak isn't affected by how fast the car is driven, how many miles the car is driven, or what load is carried in the car. The tyre will lose air at exactly the same rate whether the car is used or isn't used, and whether it's heavily loaded or unloaded. For example, if a car tyre's air pressure goes down from 35psi to 32psi in two weeks, how much the car is used or how many passengers the car carries is totally irrelevant. The air pressure will still go down from 35psi to 32psi after two weeks. Some people incorrectly think that a car tyre will only lose air if it's driven. They say, why has my car tyre gone down when I haven't driven it much. They don't realise that a car tyre loses air pressure all the time, and that the rate of lose of air pressure isn't affected by how much they use the car or how fast they go or how many passengers they are carrying, etc. Fabia MK3 7Jx16 ET46 alloy rim (about £150 each) https://eshop.skoda-auto.cz/cs_CZ/alu-kola/c/alloyWheels?q=%3ApriceAsc%3ArimDiameter%3A16%22%3AcarType%3AFabia%2BIII%2B%282014%2B%29&text=# Fabia MK3 6Jx15 ET38 steel rim (about £37.50 each) https://www.oponeo.pl/felga-stalowa/vw-w7760#22523336

Swap the wheel with the slow leak with a spare wheel. Then don't put it back on the car until the slow leak is sorted out. It doesn't help that you are using 215/45R16 tyres fitted to 7Jx16 ET46 rims, because cheap steel rims aren't available in this size. If you had 185/60R15 tyres, you could have purchased a cheap steel 6Jx15 ET38 rim and swapped the tyre with the slow leak over to this steel rim. 185/60R15 fitted to a 6Jx15 ET38 rim is one of the standard tyre and rim sizes on the Fabia MK3. One of the benefits of using 185/60R15 tyres compared to 215/45R16 is that they are a much cheaper tyre size.

Wet stopping distance Quatrac 47.1m CrossClimate 49.2m (4.5% longer braking distance) Wet lap average speed Quatrac 46.3mph CrossClimate 44.6mph (3.7% slower speed) Fuel consumption Quatrac 50.8mpg CrossClimate 49.8mpg (2% less mpg) 2022 all-season tyre review (195/55R16 tyre size) https://www.tyrereviews.com/Article/2022-Auto-Bild-All-Season-Tyre-Test.htm Before you purchase tyres online, I suggest you get a list of local tyre fitters that don't have a problem fitting tyres that you have purchased online. You could try websites that sell car tyres online, such as camskill, blackcircles, mytyres, etc. to see if they have a list of tyre fitters in the UK who are willing to fit tyres that you have purchased online. You could also try mobile tyre fitters that come round to your house or place of work in their van.