Tire reference tools built for clear comparison.

Practical tire reference tools without marketing noise.

Tire Size Comparison Tool

Compare theoretical unloaded tire size differences, including diameter, width, revolutions per mile, and speedometer effect.

Convert tread depth between 32nds of an inch and millimeters.

Convert tire pressure between PSI, kPa, and bar.

Convert distance between miles and kilometers.

Estimate tread loss, wear rate, remaining tread life, and projected mileage from tread depth measurements.

Suggest a tool, correction, or reference feature for Treadsley.

Read plain-English reference pages about tire sizing, diameter, speedometer difference, revolutions per mile, and UTQG.