Find Your Bike Fit in Seconds
If you have ever finished a long brevet with a stiff neck, sore knees, or numbness in your hands, there is a good chance your bike setup, not your fitness, was the problem. A proper fit will not make you faster on its own, but it removes the discomfort that turns a 300km ride into a miserable one.
The calculator below gives you a solid starting point. Enter a few basic measurements and it will estimate:
- Saddle height
- Frame size, in two common reference measurements
- Saddle-to-handlebar reach
- Recommended saddle-to-bar drop
- A suggested crank length
How to measure yourself
Two numbers matter most, and they only take a minute to get:
Height. Stand straight against a wall, no shoes.
Inseam. Stand against a wall with a book held snugly between your legs, spine of the book pointed up like a saddle. Measure from the floor to the top edge of the book. This is more reliable than a tape measure alone.
If you want a more precise reach estimate, also measure your torso length (collarbone to hip) and arm length (shoulder to wrist). These are optional, the calculator will estimate reach from your height if you skip them.
Bike Fit Calculator
Why this matters for long-distance riding
Randonneuring and audax rides put you in the saddle for hours at a stretch, sometimes through the night. Small fit errors that you would never notice on a short club ride become real problems over 200, 400, or 600 kilometers. A saddle set two centimeters too high strains your knees for hours. A reach that is too long rounds your back and loads your hands and wrists. Getting the basics right before you start training for a big brevet saves you from chasing symptoms later.
Try it now
The calculator below runs instantly in your browser, nothing is sent anywhere. Enter your numbers, pick your riding style and bike type, and get your estimated fit.
Remember, these are estimates for a starting position, not a replacement for a professional bike fit. If you have a history of injury or unusual proportions, a fitter can fine-tune things a calculator cannot.
