Well-made tools for people who love bikes.
Calculators, comparators, and references for builders, fitters, mechanics, and riders.
Tools
2 live · 7 planned
Gear Ratio Calculator
Compare drivetrains, visualize cadence and speed across gears.
Open tool →Tire Pressure Calculator
Optimal pressure for any tire, rim, rider, and surface.
Open tool →Frame Geometry Comparator
Overlay frame geometries to compare stack, reach, and angles.
Open tool →Tire & Rim Compatibility
Which tire widths are safe on your rims, hooked or hookless.
Open tool →Chainline & Q-factor Calculator
Calculate chainline, q-factor, and cross-chain ranges.
Open tool →Fit Finder
From body measurements to recommended geometry and components.
Open tool →Fit Translator
Transfer your fit from one bike to another, precisely.
Open tool →- Planned
- Spoke Length
- Drivetrain Compatibility
- Climb Time
Built on published methodology.
Every calculation cites its source. Every assumption is disclosed. Where the science is contested, we show multiple methods side by side.
Read the methodology →A project by Etienne Servant.
Independent designer and cyclist, building tools I wanted to exist. Available for select brand and product collaborations.
More about the work →