Sports & Fitness calculator
What Bike Wheel Size Do I Need?
Enter fork/frame maximum wheel outer diameter, tyre mounted outer diameter, and required radial clearance to work out bike wheel/tyre diameter fit.
Enter your measurements
What Bike Wheel Size Do I Need? Measure fork/frame maximum wheel outer diameter, tyre mounted outer diameter, and required radial clearance first. This tool converts them into bike wheel/tyre diameter fit so the recommendation stays tied to your actual dimensions or specification.
- Fork/frame maximum wheel outer diameter — Required
- Tyre mounted outer diameter — Required
- Required radial clearance — Required
Bike wheel/tyre diameter fit
Enter the measurements above to calculate bike wheel/tyre diameter fit.
How the calculation works
V12 calculation: requiredForkDiameter=tyreOuterDiameter+2×requiredClearance; fitPass=requiredForkDiameter≤forkMaxDiameter. This is the implementation rule for this calculator.
Worked example
Example: Fork/frame maximum wheel outer diameter = 96.64 cm; Tyre mounted outer diameter = 54.89 cm; Required radial clearance = 7.18 cm. Result: Fits; Required Fork Diameter = 69.25 cm.
Before you decide
Recheck the limiting measurement before purchase or installation. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what bike wheel size do i need, the limiting result on this page is bike wheel/tyre diameter fit.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Bike Wheel Size calculator tell me?
It returns bike wheel/tyre diameter fit from the measurements entered on this page. The calculation is specific to bike wheel size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for bike wheel size?
Measure fork/frame maximum wheel outer diameter, tyre mounted outer diameter, required radial clearance. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the bike wheel/tyre diameter fit?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned bike wheel/tyre diameter fit while allowing for the clearances, tolerances or ratings shown by its manufacturer.