Session Setup
Tires
Pre-session is the pressure your tire is at right before you roll out — hot off the warmer if you use warmers, cold from the pit if you don't. Post-session is the reading the moment you're back in.
Calculators
Workflow: check sag at the start of the weekend to validate your spring rates and ride-height balance, then use Geometry Deltas between sessions to track direction and magnitude of changes from that baseline.
Rolling Circumference
Rolling circumference is the stored setup value. Diameter is derived from it.
Suspension Sag
Measure from the same reference point each time: rear axle to a fixed subframe point (rear), or axle to a fixed fork point (front). All values in mm.
Front
Rear
Geometry Deltas
Direction is the important output. Magnitudes are estimates unless all precise constants are supplied. Use after sag is set — these track changes from that baseline.
Front End
Rear End
Optional bike constants for precise trail
Suspension
Fork
Shock
Symptoms
Lap Times
Paste one lap per line. Accepts mm:ss.sss, m:ss.s, or plain seconds.
Review
A snapshot of the current session.
Keep this session? Saving stores it only on this device, in your browser. Nothing leaves your phone.
Save & next saves this session and primes the form for the next one — bike, track, tire brand, and suspension settings stay; PSIs, symptoms, lap times, and notes clear. Session label auto-bumps its trailing number.
Reset clears every field on every tab. Saved history is not touched.
History
Saved sessions stay on this device only. Export a backup any time — it's a plain JSON file on your phone or computer.
This browser has storage disabled (private mode?). Saving, loading, and importing are unavailable here.
No saved sessions yet. Fill in a session and tap Save this session on the Review tab.
Compare two sessions
All saved sessions
About MotoTrack
What this is
A digital notebook for the pits. Log tire pressures, suspension clicks, and lap times in the moment, so your setup decisions between sessions are based on what you recorded, not what you remember.
Privacy, plainly
- No accounts. No passwords to forget.
- No tracking. No cookies, no analytics, no pixels. We don’t know you’re here.
- No noise. No notifications, no popups. It stays out of your way.
- No cloud. Nothing you type leaves your phone.
How your data works
Everything lives in your browser. If you just type and close the tab, it’s gone — like wiping a whiteboard.
If you want to keep a log, tap Save this session on the Review tab. That stores it in your phone’s internal storage. We don’t have a server, so we can’t see it even if we wanted to.
Export backup saves a file to your device — move it to a laptop or tablet any time. Clear all history deletes everything instantly.
How to use it in a session
- Setup — before you roll out: bike, track, session label, ambient and track temp.
- Tires — brand and model/compound; pre-session PSI right before you roll out (hot off the warmer or cold from the pit); post-session PSI the moment you’re back in. Tap Calculate for deltas and conservative suggestions.
- Suspension — log your clicks, tick the symptoms you felt (push, chatter, brake dive). Fixes appear for common ones.
- Laps — paste laps one per line (
1:42.318or102.4). Get best, average, and delta-from-best. - Review — Build summary for a one-screen recap. Save this session to compare later.
- History — compare two sessions, see per-track trends, back up or restore.
Before you ride
Every suggestion here is a conservative starting point, not professional tuning advice. Track rules and your tire and suspension manufacturer specs always take priority. Full terms.
Feedback
MotoTrack is a solo side project. Replies come when I’m not at the track — please be patient.
- Bugs and feature ideas: open an issue on GitHub. Public, trackable, best for anything that needs a real back-and-forth.
- Everything else: email evan.martinez@gmail.com. Private, no account needed.
Source is on GitHub: PatchnetEvan/track-helper. The “no tracking” promise is literally verifiable — read app.js and see for yourself.