Tire & Wheel Tools
Free tire and wheel calculators for fitment, replacement, and drivetrain checks. Compare tire sizes, check speedometer error, calculate wheel offset, tire pressure, gear ratio, lug nut torque, and estimated tire life.
Gear Ratio Calculator – Final Drive & Speed
Gear Ratio Calculator Calculate the theoretical top speed in each gear at redline RPM — enter your gear ratios, final drive, and tire size. Gear....
Lug Nut Torque Guide – Pattern & Spec by Bolt Count
Lug Nut Torque Guide Get the correct lug nut tightening sequence and torque range for your wheel’s bolt count — essential for safe wheel installation.....
Speedometer Error Calculator – Tire Size Change
Speedometer Error Calculator See exactly how a tire size change affects your indicated vs actual speed — and whether you’re unknowingly speeding. Speedometer Error Calculator....
Tire Life Calculator – Estimate Remaining Tread Miles
Tire Life Calculator Estimate how many kilometres are left on your tyres from current tread depth — plan your next purchase before the legal limit.....
Tire Pressure Calculator – Adjust for Load & Towing
Tire Pressure Load Adjustment Get a guideline tire pressure adjustment for heavy loads — enter your placard pressure, baseline load, and current load. Tyre Pressure....
Tire Size Calculator – Diameter, Width & Sidewall
Tire Size Calculator Enter any tire code — 205/55R16, 275/35R20 — and instantly get width, sidewall height, overall diameter, and circumference. Tyre Size Calculator Enter....
Tire Size Comparison – Compare Two Tire Sizes
Tire Size Comparison Compare two tire sizes side-by-side — see diameter difference, speedometer error, and ground clearance change. Tire Size Comparison Tool Two codes →....
Wheel Offset Calculator – ET, Backspacing & Poke
Wheel Offset Calculator Convert between ET offset, backspacing, and poke — check wheel fitment before buying new rims. Wheel Offset Converter ET ↔ Backspacing ↔....
