road bike•race geometry•2025
Trek Madone Gen 8 Geometry & Size Chart
Trek Madone Gen 8 geometry (2025), compare stack, reach, and every supported size, then open the TrainCraft calculator with this bike preselected.
- Supported sizes
- XS, S, M, ML, L, XL
- Family
- This bike leans toward an aggressive front end, faster steering, and a more performance-oriented position.
- What to compare
- Use this guide to compare stack, reach, and stock cockpit assumptions before choosing a frame size.
Quick size check
What Trek Madone Gen 8 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.
No account needed for this check. The full report keeps this bike preselected.
What you get after the size check
A complete setup now. A Fit Passport when you sign up.
A paid report unlocks the complete setup and print-ready PDF for this bike. No account is required. Create a free fit profile separately to save and reuse your fit.
Paid report for this bike
Compare every size and get saddle position, cockpit coordinates, stem, spacers, bar width and crank length. No account required.
Print-ready PDF included
Export the paid report as a clean A4 PDF to keep, print or take into the workshop when this bike is being set up.
Free Fit Passport for ongoing fitting
Create a free fit profile to save measurements and reports across devices, prefill new fits, recalculate after profile changes, fine-tune by symptoms and get the lower in-app report price.
Geometry and size breakdown
Use the geometry table as context, then enter your measurements above before opening the full fit report.
| Size | Stack | Reach | Top tube | Head tube | Stem | Crank | Size check |
|---|---|---|---|---|---|---|---|
| XS | 507 mm | 370 mm | 517 mm | 100 mm | 80 mm | 165 mm | Check with my measurements |
| S | 530 mm | 378 mm | 532 mm | 121 mm | 90 mm | 165 mm | Check with my measurements |
| M | 546 mm | 384 mm | 545 mm | 136 mm | 90 mm | 170 mm | Check with my measurements |
| ML | 562 mm | 389 mm | 557 mm | 150 mm | 100 mm | 172.5 mm | Check with my measurements |
| L | 582 mm | 394 mm | 568 mm | 172 mm | 100 mm | 172.5 mm | Check with my measurements |
| XL | 610 mm | 402 mm | 584 mm | 201 mm | 110 mm | 175 mm | Check with my measurements |
How to use this guide
Start with the size table to narrow the geometry range you actually want. Then open the calculator to compare that geometry against your body dimensions, flexibility, and fit priorities.
The TrainCraft bike fit tool models saddle height, cockpit reach, and bar drop using the frame geometry plus stock cockpit assumptions for the Trek Madone Gen 8.
That is more useful than a generic height chart because two sizes can both fit your height while requiring very different stems, spacers, or saddle positions.
Looking at other Trek bikes? Trek sets frame sizes model by model. Trek size calculator →
Who races the Trek Madone Gen 8?
Riders and teams racing the Trek Madone Gen 8 in the pro peloton this season.
Mads Pedersen
Won stage 4 and the green jersey, Tour de France 2026.
See 2026 Tour stage results →Jonathan Milan
Mattias Skjelmose
FAQ
- What size Trek Madone Gen 8 should I get?
- It depends on more than your height. Two riders of the same height can need different Trek Madone Gen 8 sizes, because inseam, torso length and flexibility change the reach and bar drop that suit them. Enter your height and inseam in the size check on this page to see which size fits you.
- What height is each Trek Madone Gen 8 size for?
- Height ranges are only a rough guide: they overlap, and riders near the edge of a range often fit the next size better. The size check on this page uses your height and inseam to show where you land on the Trek Madone Gen 8.
- Should I size up or down on the Trek Madone Gen 8?
- Between two sizes, the smaller frame usually needs a longer stem and more spacers, and the larger one a shorter stem and a lower front. Which one works depends on your body and flexibility. The size check shows your size; the full fit gives the exact setup that size needs.
- What sizes are available for the Trek Madone Gen 8?
- TrainCraft currently tracks these Trek Madone Gen 8 sizes: XS, S, M, ML, L, XL. The calculator uses each size's published geometry and stock cockpit assumptions to compare fit outcomes.
Rivals to put next to the Trek Madone Gen 8
Matched sizes, stack and reach deltas, and a fit check for your measurements on both frames.
Related road bike guides
Use nearby model pages to compare positioning trends before choosing between similar bikes.
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.