Tuning Tools
Tire Size Calculator
Compare two tire sizes and see diameter, circumference, sidewall height, and percent difference. Tire changes can affect speedometer accuracy, shift timing, and torque calculations.
Current Tire
New Tire
Use metric tire format: width / aspect ratio / wheel diameter. Example: 275/55R20.
Tire Comparison
MeasurementCurrentNew
Diameter--
Circumference--
Sidewall--
0.0% Difference
A tune update is usually recommended when tire diameter changes enough to affect speedometer accuracy, shift behavior, or ABS/traction assumptions.
JR Jones Racing Tune Files & Cam Kits
Use these tools to confirm your engine, drivetrain, tire size, gear ratio, or RPO codes before ordering. Once you know what you have, JR Jones Racing can help match your vehicle to the correct tune file, camshaft tune, DOD/AFM delete tune, MDS delete tune, or cam kit.