MkIV
TT wheels are 17x8 and 17x9.5 F/R respectively.
Crypton is bang on, 245/45/18 doesn't just seem too tall, it is way too tall.
225/50R16 (Stock Dia) is ~24.9"
265/45R18 dia is ~27.38", 9.25% dia difference
245/45R18 dia is ~26.68", 6.86% dia difference
In short, your tires are WAY taller than they should be. I'm gonna assume that since you're here asking these questions, it wasn't intentional either
You could consider these sizes:
265/35R18: 25.3" tall, 1.78% dia difference
245/35R18: 24.75" tall, 0.41% dia difference
I should also point out your speedometer will be reading 10% slow with your enormous tires: so if it says 60MPH, you're actually doing 66MPH.
EDIT: Nice catch Shaeff
