Module 002
Choose your frame on measurements, not on a size label
A size M can vary by 25 mm of reach from one brand to another. The module compares your target position against more than 10,000 referenced geometries and tells you which size fits, and with which stem.
More than 10,000 frames · nearly 50 brands
What it does
What the comparator looks at
Two measurements decide almost everything: stack and reach.
Stack
The vertical height between the bottom bracket axle and the top of the head tube. It determines your possible handlebar height.
Reach
The horizontal distance on the same reference. It sets your extension — and the back pain when it is too long.
Required stem
For each frame, the stem length and angle that bring you back to your target position.
Referenced frames
10,000+Road, gravel, MTB, triathlon and time trial, across nearly 50 brands.
Simultaneous comparison
3Three frames side by side, same measurements, same reference position.
What you get
A decision, not a table of numbers
Recommended size
Per model and per brand, derived from your morphology and your target position — not from your height in centimetres.
Gap to your position
How many millimetres are missing or in excess, and whether a stem is enough to correct it.
Matched to your body
The geometries that best match your profile, including the ones you would not have looked at.
Comparison with your current bike
Your starting measurement serves as the reference, which makes the gap readable at a glance.
The process
How to use it
Your target position
It comes from your video analysis, or from your body measurements if you have not filmed yet.
You pick the frames
Up to three models, all sizes, from the referenced database.
You read the gaps
Stack, reach, required stem, recommended size. Side by side.
You decide before buying
A frame that needs a 130 mm stem to fit you is not the right frame.
The comparator can be browsed in the free version. Matching against your target position requires paid access, one-time purchase or subscription.
Check the geometry before you reach for your wallet
A badly sized frame cannot be fixed with accessories. Compare the measurements first — browsing is free.
More than 10,000 frames · nearly 50 brands