How Position Match calculates your result
Compare two cockpits in millimeters, then see the stem and spacer changes needed to reproduce your reference handlebar position.
Start with evidence, not a score
Use manufacturer stack and reach for the exact model year and size. Add headset top-cap height consistently to the spacer-stack input. Convert the stem and spacer arrangement into handlebar-clamp coordinates relative to the bottom bracket. Compare those coordinates instead of nominal frame size.
Read the assumptions
Solve the inverse stem geometry while holding the candidate spacer height fixed. Check real component sizes and every manufacturer limit before making a change. A cockpit calculation cannot guarantee fit, comfort, safe component installation, or handling. Validate the setup with a qualified fitter or mechanic.
Use a reproducible workflow
Enter your own measurements or import records using the published CSV schema. Save a local scenario before making a change, compare the result, and export a copy with the assumptions intact. Example inputs are not a verified catalog or a live data feed. The source references explain the underlying terminology; they do not independently verify information you enter.