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Choose by task
Start with the question you can answer today. Measure your body, compare frames or cockpit parts, transfer a measured position, plan a crank or cleat change, or use the camera while you pedal. Every tool runs in your browser, shows where its numbers come from and tells you where the result stops.
Not sure where to begin?
Build the complete baseline first. It connects your dimensions to the guided camera and re-check flow.
The cards are organised by outcome, not by cycling jargon. A tool can appear in one primary group even when its result feeds another step. Use one change at a time and keep the original setup marked.
Start with body measurements and turn them into transparent reference ranges.
Use height, inseam, goals and mobility to build cited starting ranges for the whole bike.
A connected Fit Plan for saddle, cockpit, crank and camera verification.
Open tool →Compare LeMond, Hamley and knee-angle methods instead of trusting one magic formula.
A saddle-height starting range plus the angle to verify on your bike.
Open tool →Use your phone camera to check movement on the bike without uploading video.
Measure knee, hip, elbow and trunk movement in the browser while you pedal.
On-device angles with quality and confidence signals; no video upload.
Open tool →Walk through the real analysis, repeatability, suggestion and re-check flow with synthetic data.
A safe preview of the complete workflow without camera permission.
Open tool →Translate component or frame differences into coordinates you can reason about.
Put two frames on the same stack/reach coordinate system and see the signed differences.
A factual frame delta without a fabricated fit score or body-shape guess.
Open tool →Compare stem, spacer and handlebar combinations as signed horizontal and vertical coordinates.
Exact bar-clamp and nominal hood deltas without a fabricated fit verdict.
Open tool →Compare a current and candidate crank, then see the linked saddle and top-of-stroke geometry changes.
Exact mechanical deltas and a one-change-at-a-time installation checklist.
Open tool →Capture repeatable contact coordinates, transfer setups and group adjustment checks by bike.
A guided measurement workflow, one private history and local JSON portability.
Open tool →Make one controlled change, keep the original position marked, then re-check.
Use two real sit-bone impressions and a repeatability check—never height or body type.
A convention-labelled starting range or a clear request to measure again.
Open tool →Record the starting coordinate, change one cleat axis by a small amount and re-check after riding.
An exact reversible trial plus a keep, revert or stop decision after 2–3 rides.
Open tool →Turn a measured setback into one small forward or backward trial while preserving the baseline.
An exact target coordinate plus a reversible ride re-check linked to one bike.
Open tool →Repeat a real width measurement and compare left/right lever reach from the same reference.
Observed width and lever-symmetry deltas without an invented ideal or click count.
Open tool →Calculator inputs, bike profiles, comparison values, fit sessions, pose landmarks and journals stay on this device. Camera processing runs on-device; OpenBikeFit does not upload your fit or video and does not require an account. Only feedback you deliberately submit leaves the browser.
Read the exact storage inventory in the device-storage policy, inspect the evidence and limitations, or review the privacy notice.