@decryption@aus.social hmm, dunno about this - there's only 0.07% difference in actual tyre diameter because the 18s are 60 profile and the 20s are 50 profile. They've probably done that to keep the actual tyre diameter as close as they can make them. (Can plug the numbers into a calculator like https://tiresize.com/tyre-size-calculator/ to see the diameters.) The 18s with the extra profile will probably ride a bit nicer, I'm generally skeptical of the auto industry's tendency to go for huge wheels. But not sure if it'll make a difference on range specifically. EDIT: My % was off by a factor of 10