Prove the fit actually worked.
Run sessions on a tablet. Hand the rider a real report. Then watch the metrics that actually move with fit — L/R balance, time standing, pedal smoothness — across their next 30 days of rides.
Free during early access. No card. You can switch off any time — the rider data leaves with the rider.
A studio platform, not a spreadsheet.
Every primitive a serious bike-fit studio actually uses, on one rider record.
Tablet capture
Lay the iPad on the bench. Type measurements with the rider on the trainer. Live knee-angle check from their body data flags out-of-range values before you save.
One report, printable
Cover page, intake summary, before/after measurements, the photos you took, your signature. Generate as PDF and email it — or hand them a printed copy.
Automated touchpoints
Post-fit follow-up, 30-day check-in, quarterly review, annual refit — auto-scheduled when you save the session. Override per rider, snooze, or cancel from the fitter inbox.
Fit-impact view
When the rider uploads their .fit rides, we compare the 30 days before vs after the saddle change on L/R balance, time standing, and pedal smoothness. Real proof, not training noise.
Garage of bikes
Every rider, every bike, every measurement, every revision. Pull up a returning rider's last fit on any device — the timeline shows you every change made by anyone.
Cross-fitter handoffs
Multiple fitters in a studio share the rider roster. Past sessions stay attributed; the rider grants what they want visible. Travelling rider? Their next fitter sees the history.
The rider owns the data. You keep the relationship.
Every other fit platform locks the rider record inside the studio's account. The rider can't see it without an invite, can't take it with them, can't share it with a future fitter without re-keying everything.
Flux inverts that. The rider has an account too — phone app or web. They see their own measurements, grant you access, revoke it if they want. You see exactly the rider records riders have shared with you. Switching to a different studio costs nothing on either side. Which is exactly why your work has to speak for itself — and it does.
- No lock-inCancel any time. The rider keeps every measurement, photo, and report.
- Granular grantsRiders decide which fitters see their bikes vs body measurements vs activity data.
- Audit-friendlyEvery revision attributed to a fitter and timestamp. Liability-clean.
The metric your competitors don't have.
Every studio takes measurements. We're the only one that ties those measurements to what the rider's body actually does on the road in the weeks after.
They upload their rides (.fit)
Riders export .fit files from their head unit (Garmin / Wahoo / Hammerhead) and upload them — we read the power, cadence, balance, and time-standing series for every ride for the before/after comparison.
You change a fit value
Saddle +5 mm. Stem swap. Cleat reposition. When you save the session, we mark the change with a date.
We compare 30 days before vs after
L/R pedal balance, time out of the saddle, pedal smoothness — the metrics that genuinely move with fit, not the ones that just move with training. You get a one-glance card showing what changed. So does the rider.
How a fit actually runs.
- BeforeRider intakeSend the rider a self-serve intake link or have them fill it on the iPad in the waiting area. Goals, pain points, current bikes, body measurements. Lands on the session card before they walk into the bay.
- DuringTablet captureType measurements as you take them. Live knee-angle check flags out-of-range values. Snap a side-on photo and pull saddle / bar / cleat coordinates straight off it.
- At saveReport + touchpointsGenerate the printable report. Touchpoints (30-day check-in, quarterly review, annual refit) auto-schedule. Email the report to the rider — or hand them a printout.
- AfterWatch the metricsDays later, fit-impact starts to fill in. You can see whether the saddle change actually moved the rider's L/R balance across real rides — and so can they.
Free while we're in early access.
We're onboarding the first fit studios now. The deal: you get the full platform free for at least the first 12 months, and we work directly with you on what to build next. When we do price, partners get the founder rate forever.
- ·Unlimited fitters per studio
- ·Unlimited riders, sessions, reports
- ·Email + tablet + phone surfaces
- ·.fit ride ingest for fit-impact
- ·Direct line to the team while we build
The questions every studio asks first.
Run your next fit on Flux.
Sign up takes a minute. You're in the fitter portal as soon as you verify your email — start a session before your next appointment walks in.