Brand size guide
Polygon size calculator
Choose your Polygon model, add your height and inseam, and see which frame size suits you on that bike. Polygon sizing is set model by model, so the check runs on the geometry of the model you pick.
Find your Polygon size
Frame sizes differ between models, so pick the bike you are considering.
Quick size check
What Polygon Strattos C9 AXS size fits you?
Get an instant frame estimate, then continue into the full fit report to check cockpit reach, bar drop, and setup risks before you buy.
Your measurements have been calculated for this bike. Exact sizes, rankings, setup numbers and risk details are ready in the full report.
Calculating…
No account needed for this check. The full report keeps this bike preselected.
How Polygon sizing works
TrainCraft covers 3 Polygon models, and all of them use lettered sizes (S, M, L and so on). A letter is a label, not a measurement: the same letter sits on different stack and reach from one model to the next.
Stack and reach decide how a frame fits. Each model below lists them for every size, and the calculator reads your result against that geometry.
Polygon models you can check
Open a model for its geometry and size chart, or select it in the calculator above.
XC mountain bike
Frequently asked questions
- What size Polygon should I get?
- It depends on the model as much as on you. Polygon frame sizes are set per model, and two riders of the same height can need different sizes depending on inseam and torso length. Pick your model in the calculator at the top of this page, enter your height and inseam, and the check shows which size fits you.
- How do I find my Polygon frame size?
- Choose the Polygon model you are looking at, then enter your height and inseam in the size check. It compares your measurements with that model's stack and reach for every size. The model pages below show the full geometry.
- Is a Polygon size the same on every model?
- No. Size labels are set per model, and the same label can have different stack and reach on another model. Check the model you plan to buy, not the label alone.
- Which Polygon models can I check?
- TrainCraft covers 3 Polygon models: Polygon Strattos C9 AXS, Polygon Tambora G4, Polygon Siskiu T8.
TrainCraft training
Prepare for a goal or an event
Read training guides by goal and preparation roadmaps for cycling events, and use free structured workouts with .zwo export. Training plans are part of PRO. Adaptive plan changes that you review and apply are part of PRO AI.