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As "settings" i mean the gauges cluster module using long coding over OBD interface. Just as the OBDEleven threads for Octavia Mk.4 before FL, and for Golf mk 7 and 7.5 are stating. Or is the ASC doing it in a different way?

Well the thing I don't know for sure is how badly the electronics might react to the smaller wheel diameter, and don't really want to waste money on "incompatible" tires. On pre face-lift models it's apparently not a big deal according to some threads, and the wheel size change in the computer is quite easy and painless (within some limits of course of supported wheel sizes, but there are usually way more sizes programmed than just the two oem sizes for this specific Octavia version, at least according to VW threads). Although looking at octavia spec the smallest oem wheel is the 205/60 r16, and that's 1.12% smaller than the 225/45 r18 - so quite close still, and it may be that the computer/clusters don't have a small enough tire circumference profile available even if it was possible to modify those settings. I assume that that setting, as it's exactly what the Authorized Service Center changes when changing tire size within oem options, propagates to all the modules that need this information, as even within the OEM tire sizes, they span from 205/60 R16 with 652mm circumference, all the way to 225/40 r19 with 662mm circumference, so over 1.5% difference - still possibly significant for all those advanced electronics, assists, radars etc. So unless the dials module has some Golf profiles in there, this may not be possible at all, and an experiment will be necessary. Thankfully that can be done as soon as sfd2 get's unlocked, without the need to physically swap the tires, as the setting change will change the indicated speed, and that's enough to calculate what circumference each profile corresponds to. Would be nice though if all of that was just openly available in the user manual for the car. Or perhaps some "advanced user" manual - optional.

Pretty sure no warranty covers tyres or any consumables on the car like brakes, fluids, oils, filters, shocks, suspension joints etc. Additional insurance "warranties" may cover, or partially cover such things, but that's quite some extra money upfront each year, especially on a brand new car. Sorry to hear you got so unlucky with the flats lately. I'm quite certain that if you bought a spare wheel and put it in the boot then you wouldn't get flats anymore ;) As to the unsprung weight, I am replacing the 18" skoda comet rims that are 13.2kg each according to Skoda with jrwheels SL01 18x8 , that should weigh around 8.3kg each, so that will be already a huge reduction of almost 20kg of unsprung mass on the car, but if it would be possible to remove additional 4-6kg and also get same premium threads but cheaper - well that would be a win win scenario, and certainly can't hurt also the daily driving. As a matter of fact i planned to get 5 rims and tires, to get a full size spare wheel. As I understand it should fit in the spare wheel well, and the canton sub should fit inside of the rim, or am I mistaken? Going back to the main topic, indeed, the circumference difference is too big for daily use, considering all the electronics on the car.

In very recent tire review tests those All Seasons tend to get within 5% off the best premium winter tires (like Michelin Alpin 5) in various snow traction tests, or even on par in some specific aspects (like ice traction). While on the wet they're vastly superior (10-20% better in aquaplaning, breaking, handling) than winter tires. So while I'll certainly use them in the winter in the mountains in proper snow for a few weeks each year, most of the time it would be the wet conditions to worry about, and unfortunately pure winter tires aren't really that good in the wet. All seasons will be also best for me, because then I can use the summer set to be track day specific, and I already did an hour on the Nürburgring this summer, and it does have the performance to eat up tires, so this way I wouldn't need 3 sets of wheels, or joggling tires. Well, the actual point behind going 225/40 r18 would be not about some snow traction shenanigans, but rather having the same tire and wheel size for track day set, and winter set, so that rims clear the breaks, the speedo properly set once, and at the same time I can get the lightest wheels possible without breaking the bank. That's the main reason why I was thinking about it. 19 inch rims are noticeably heavier, and again, 225/40 r19 has even worse tire selection than 225/45 r18, and are also significantly more expensive for the same tire model - so not much sense to pay significantly more for a heavier rim and a heavier tire with even more inertia in a performance car. I was after the 225/40 r18 Goodyear Vector All Season 4, because they got measured at just 8.1kg each, while other tires in that size are near 9 or even 10 kg each, and 225/45 r18 ones are obviously a bit heavier still. That's a good point. And I double checked that OBD11 still doesn't have SFD2 unlock, and besides the car is under warranty, so fiddling with it could be quite consequential. I'll just got with the stock size Pirellis SF3 then. Perhaps I'll get back to this topic in two years time after the warranty runs out, and hopefully OBDEleven gets the sfd2 unlock working.

Hi, Earlier this year I bought a 2026 Octavia IV RS Combi, and it came with 225/45 r18 summer tires. It's this time of year that I have to start thinking about getting a winter setup. I've noticed that even current gen Golf's use 225/40 R18 tire size, and quite a lot other cars do as well. I've also noticed that 225/40 R18 size has much more new premium tire models available (like Michelin CrossClimate3 Sport, or Goodyear Vector All Seasons 4), while they're not available in 225/45 R18 size. And interesting tires that are available in both sizes, like Pirelli SF3 are exactly 50% more expensive in the 45 profile compared to 40 profile. Needless to say, I see a lot of benefits of going with th 225/40 R18 for my winter tires setup, but that will give me over 3% smaller wheel diameter. Therefore does anyone know if that will work? Won't abs/esp go crazy? Is it possible to modify the wheel diameter in the car computer using a new OBD Eleven interface perhaps?

What your talking about is "Full time AWD" vs "Part time AWD". Full time AWD is often vaguely called 4WD (which is not really correct, as a car doesn't have to have specifically 4 wheels, while the whole point of this differentiation is not about that at all), and Part time AWD systems are usually called AWD (but again, that's layman speech). Part time system with locked haldex works exactly like a Full time system with locked central diff, so in the basic setup it gives better traction than a Full time AWD system with 3 open diffs and no trick electronics.

Tell me what do you want to know exactly. You can see some general info on functionality with specific models, and it basically supports all VAG cars with OBD and an ECU. Here's the search site for supported cars: https://obdeleven.com/en/supported-vehicles For my car it's only ecu and immobiliser modules, but when i looked up newer Felicia models (ones with abs, airbags etc) it had support for more modules for them. I can 100% recommend it for data, fault codes etc. readout, and fault codes clearance. It's supposed to be able to do much more even on Felicia, but as mentioned I didn't have the need to try it yet, so I can't say if or how well it works. Also I think that there's a cheaper "non pro" version without the coding functionalities, so that's also an option.