Trek Farley geometryMTB · 2023 · 4 sizes, from S to XL
The Trek Farley is a mtb bike available in 4 sizes, from S to XL. Stack ranges from 589 to 626 mm and reach from 400 to 495 mm. Its position sits between racing and endurance. All sizes share 450 mm chainstays.
What size Farley 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 Trek. The ones that matter most for choosing a size are in bold.
| Size | S | M | L | XL |
|---|---|---|---|---|
| Stack | 589 | 599 | 613 | 626 |
| Reach | 400 | 430 | 460 | 495 |
| Effective top tube | 565 | 598 | 633 | 672 |
| Head tube length | 90 | 100 | 115 | 130 |
| Head angle | 68.5° | 68.5° | 68.5° | 68.5° |
| Effective seat angle | 74.0° | 74.0° | 74.0° | 74.0° |
| Actual seat angle | 72.5° | 72.5° | 72.5° | 72.5° |
| Chainstay length | 450 | 450 | 450 | 450 |
| Wheelbase | 1,097 | 1,131 | 1,166 | 1,207 |
| BB drop | 65 | 65 | 65 | 65 |
| BB height | 320 | 320 | 320 | 320 |
| Fork offset | 42 | 42 | 42 | 42 |
| Trail | 107 | 107 | 107 | 107 |
| Standover | 730 | 740 | 760 | 780 |
| Seat tube (method not stated) | 380 | 420 | 450 | 490 |
Source: Trek 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 Farley 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 589/400 mm in size S to 626/495 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 Farley in size M?
Stack of 599 mm and reach of 430 mm, with an effective top tube of 598 mm and a head angle of 68.5°.
Is the Farley a racing or an endurance bike?
In between. In size M its stack-to-reach ratio is at percentile 54 of mtb bikes: neither very low nor very tall.
Does it have the same geometry as the Lando XC Fox?
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.