Wilier Triestina Usma SL geometryMTB · 2027 · 4 sizes, from S to XL
The Wilier Triestina Usma SL is a mtb bike available in 4 sizes, from S to XL. Stack ranges from 597 to 630 mm and reach from 405 to 478 mm. Its position sits between racing and endurance. All sizes share 425 mm chainstays. Data from 2027; geometry from 2026, 2025 is also available.
What size Usma SL do I need?
Enter the stack and reach of a bike that fits you well and we will tell you which size is closest and how to set it up.
Enter your stack and reach to see which size fits you best.
Geometry chart by size
Measurements in mm and degrees, as published by Wilier Triestina. The ones that matter most for choosing a size are in bold.
| Size | S | M | L | XL |
|---|---|---|---|---|
| Stack | 597 | 608 | 619 | 630 |
| Reach | 405 | 430 | 454 | 478 |
| Effective top tube | 565 | 593 | 620 | 647 |
| Seat tube (centre-to-top) | 400 | 440 | 480 | 520 |
| Head tube length | 84 | 96 | 108 | 120 |
| Head angle | 67.8° | 67.8° | 67.8° | 67.8° |
| Chainstay length | 425 | 425 | 425 | 425 |
| Wheelbase | 1,090 | 1,120 | 1,148 | 1,177 |
| Seat angle (method not stated) | 75.0° | 75.0° | 75.0° | 75.0° |
Source: Wilier Triestina official website · data from 11 Nov 2026. Spot a mistake?
Stack and reach of every size
Higher means a taller front end; further right means a longer reach. The blue dot is your search.
Character of each size
Compared with other mtb bikes. Further right means more of that quality.
Bikes with similar geometry (size M)
The closest size of other mtb models, by stack and reach.
Frequently asked questions
What size Usma SL do I need?
It depends on your position, not just your height. The most reliable way is to compare the stack and reach of a bike that fits you with those of each size (from 597/405 mm in size S to 630/478 mm in size XL). The size finder on this page shows the closest size and the stem and spacers you would need.
What are the stack and reach of the Usma SL in size M?
Stack of 608 mm and reach of 430 mm, with an effective top tube of 593 mm and a head angle of 67.8°.
Is the Usma SL a racing or an endurance bike?
In between. In size M its stack-to-reach ratio is at percentile 63 of mtb bikes: neither very low nor very tall.
Does it have the same geometry as the Grand Canyon AL?
In size M, yes: same stack and reach. If one already fits you, the same size of the other will put you in the same position.