Bike Size Calculator
Calculate your size with height, inseam, bike type, brand, model, and riding preference. If you do not know your inseam, start with the estimate and confirm before purchase.
Step 1
Measure height and inseam
Step 2
Choose bike type and brand
Step 3
Check standover and geometry
Enter your measurements to see your recommended size, backup size, confidence, and why it fits.
Recommendation logic
Height sets the range. Inseam and geometry explain the fit.
Official size chart ranges
Bike type fit patterns
Brand and model labels
Standover, stack, and reach
Calculator FAQ
Use the result as a short list, then verify the exact model geometry.
Can I calculate bike size without inseam?
Yes. Use the inseam estimate option for a first pass, then measure inseam before buying when standover clearance matters.
Why do brand and model matter?
Brands use different labels and geometry. A medium road bike from one brand can overlap with a 54 or M/L from another.
What should I check after the calculator result?
Confirm standover, stack, reach, and the brand's published chart for the exact model and year you plan to buy.