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As per the other thread where I asked about my 19" rims (235/35-R19) that came stock on my MK VII DSG w/ DCC R and looking to switch to 18" rims for avoiding pothole damage, I am therefore considering 18" wheels (with all season tires): Even though VW's 18" standard on the 'base' (manual) Golf MK VII R are 225/40-R18, I have been reading that people are using 235/40/R-18 as a substitute for the 19" OEM rims on their DSG Rs for the following reasons I gather: My understanding of the benefits of 235/40-R18 vs 225/40-R18: 1) The 235 has a taller sidewall than 225 (94mm vs 90mm). My 19" Cadiz rims (OEM) only have 82.25mm sidewall height to protect from potholes. 2) The 235 is wider for better handling in dry conditions to lose 3) diameter of 235 tires and not needing to do speedometer adjustment https://www.mcgrefer.com/sizeinfo/2354018 645.2 overall diameter https://www.mcgrefer.com/sizeinfo/2353519 647.1 overall diameter As NeilCM noted: For instance check Tire Rack's page on the Bridgestone Potenza RE050A: http://www.tirerack.com/tires/tires....Potenza+RE050A The high line R's 235/35-19 tire is listed with 817 revs/mile, and so is the 235/40-18 (speed rating/radial letter omitted here for clarity). They both have the same tread width too. Therefore these are exact substitutions for one another for use on 19" and 18" rims (end quote). If I do decide to go with 235/40-R18 (unless someone convinces me otherwise / assuming I am not missing anything) and my priorities are to 1) avoid doing any suspension mods 2) avoiding any 'rubbing' issues or other issues ----------------- To switch to 235/40-R18 rims to use on a 2016 MK VII R that came with 19" x 8" ET50 rims with 235/35-R19 tires and to keep everything safe and just add some sidewall height (11.75 mm), given all the wheel well / fender measurements etc.: 1) what is the proper (safest) offset (ET45, or rather ET49/ET50? I believe the 19" are ET50 and higher is better for no chance of rubbing?) 2) what is the proper (safest) rim width (8"? I also see 8.5" used by some?) The 19" stock rims are 8" --------------- I am not new to wheels / tires, but offset IS new to me and I also never had to worry about selecting rim width myself since I always went with OEM rim size, but that is not the case here (switching from 19s to 18s). Thanks a lot in advance!!!