Find equivalent tire sizes based on overall diameter. Works with metric (120/70-17) and inch (3.50-18) formats.
How equivalency is calculated
Two tires are considered equivalent when they share the same rim diameter and their overall tire diameter is within the selected tolerance (default ±3%).
Section Height = Width × (Aspect / 100)
Overall Diameter = (Rim × 25.4mm) + (2 × Section Height)
Always verify with your bike's manual and a qualified mechanic before swapping tire sizes. Clearance, speedometer calibration, and handling can be affected.