Wheel Fitment Guides & Build Advice
Fitment guides, wheel and tire advice, buying guides and build ideas for your car.
255/40R17 vs 245/45R17: Why Sidewall Height Changes Everything
The difference between 255/40R17 and 245/45R17 isn't about tire width — it's about sidewall flex. Most enthusiasts focus on the 255 vs 245 width diffe
Feb 28th 2026
Everything you need to know about tire sizing
If you look at your tires you’ll find all kinds of different numbers, letters, symbols… maybe even hieroglyphics. To the untrained eye these might see
Dec 31st 2024