Film your ride.
See what to change.
Set your bike on a trainer and film a few minutes of steady pedalling. Llyr shows you one thing to change, drawn on your own body.
One phone, beside your trainer. No sensors, no account.
Film on a trainer
Put your bike on a trainer, a bike stand or rollers, and stand your phone at hip height. Llyr shows you how to frame the shot.
Already have a clip? Import it from your gallery, trim it to the part you want, and tap Analyze.
Side-on
Saddle height, reach, toes, elbows, upper body and cadence.
From the front
Which way each knee travels as you pedal.
From behind
Whether your hips rock on the saddle.
Check your bike fit
Llyr reads your knee at the bottom of the pedal stroke, your hips at the top, your reach and your knee path, then says which way to adjust.
Every nudge is a direction, never in millimetres: raise the saddle a little, film again, and see what changed.
Saddle height
How much your knee bends at the bottom of the stroke.
Fore and aft
Where your knee sits over the pedal with the crank level.
Reach
Your trunk and shoulder angle out to the bars.
Knee path
How straight each knee travels, seen from the front.
Bike Fit comes with a paid Llyr Pro subscription. It is not part of the free trial; ride corrections are.
Llyr is a second set of eyes, not a professional bike fit. If a fitter sees it differently, go with your fitter.
Find your bike shoe size
Put your foot on a sheet of A4 paper and point your phone camera at it. Llyr measures your foot against the paper and recommends a size.
For bike shoes it allows a snugger fit than for running shoes. Brands vary, so use it as a starting point and try the shoe on.
Shoe sizing comes with a paid Llyr Pro subscription. It is not part of the free trial.
Corrections as you ride
Llyr flags what repeats across your pedal strokes, not one odd moment, and draws it on your own body with one short cue.
Saddle high
Your knee nearly straightens at the bottom of the stroke and your hips reach for the pedal. How to fix it
Saddle low
Your knee stays deeply bent, even at the bottom of the stroke. How to fix it
Knee in or out
Seen from the front, a knee drifts in or flares out as you pedal. How to fix it
Hip rock
Seen from behind, your hips dip from side to side on the saddle. How to fix it
Toes down
Your toes point down hard at the bottom of the stroke.
Upper body bounce
Your shoulders and head bob as you pedal.
Locked elbows
Your arms stay straight and stiff on the bars.
Head drop
Your head hangs low, with your eyes off the road ahead.
Hunched
Your shoulders round up toward your ears.
Low cadence
Your pedal rate, in turns per minute, sits low for the effort.
Built for your body
Every rider is built differently. Llyr reads saddle height from your own knee range, not one number for everyone, and draws each correction on you.
Private by default
No account and no sign-up. Your video is processed on your phone and isn't uploaded to us.
What Llyr doesn't claim
One phone camera measures body position, not power, force or pedal pressure.
It never makes claims about injury or injury risk.
Works alongside your fitter
Llyr is not medical advice. If Llyr and your fitter or coach disagree, go with them.
Film your next ride.
Llyr is on Google Play for Android phones. Set your bike on the trainer and pedal.
Free to install. One subscription covers all four modules. The 7-day trial covers swim, ride and run analysis; Bike Fit and shoe sizing need a paid subscription.