Bike Size Calculator
Calculate Bike Frame Size
in
in
Formula
Road frame = inseam (cm) × 0.70 | Mountain frame = inseam (cm) × 0.66 | Hybrid frame = inseam (cm) × 0.685
Frequently Asked Questions
How is bike frame size calculated?
For road bikes, multiply your inseam (in cm) by 0.70. For mountain bikes, multiply by 0.66. For hybrid bikes, multiply by 0.685. The result is your recommended frame size in centimeters.
Should I size up or down if I'm between sizes?
If you're between sizes, choose the smaller frame for a more agile, responsive ride, or the larger frame for more stability on long rides. Your riding style matters too — aggressive riders tend to prefer smaller frames.
How do I measure my inseam for bike fitting?
Stand against a wall in bare feet. Place a book between your legs snugly against your crotch. Measure from the top of the book to the floor. That measurement in inches (or cm) is your cycling inseam.
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