Fitment Calculators
Free tools for planning wheel, tire, and suspension fitment. All math is open and tested.
Wheel Offset / Backspacing
Convert between offset and backspacing; visualize hub face position.
Open calculator →Tire Stretch
Section-to-width stretch ratio and classification.
Open calculator →Fender Clearance / Poke
SoonComing soon.
Wheel Spacer
Effective offset after adding a spacer, with stud-length advisories.
Open calculator →Ride Height / Drop
SoonComing soon.
Brake / BBK Clearance
SoonComing soon.