Trek Marlin geometryMTB · 2023 · 8 sizes, from XXS to XXL
The Trek Marlin is a mtb bike available in 8 sizes, from XXS to XXL. Stack ranges from 544 to 651 mm and reach from 365 to 520 mm. Its position sits between racing and endurance.
What size Marlin 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 | XXS | XS | S | M | ML | L | XL | XXL |
|---|---|---|---|---|---|---|---|---|
| Stack | 544 | 563 | 572 | 609 | 614 | 618 | 637 | 651 |
| Reach | 365 | 390 | 415 | 440 | 455 | 470 | 495 | 520 |
| Effective top tube | 521 | 551 | 579 | 615 | 631 | 647 | 678 | 707 |
| Head tube length | 90 | 90 | 100 | 105 | 110 | 115 | 135 | 150 |
| Head angle | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° | 66.5° |
| Effective seat angle | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° | 74.0° |
| Actual seat angle | 74.0° | 73.8° | 73.8° | 73.4° | 73.4° | 73.4° | 73.4° | 73.4° |
| Chainstay length | 433 | 433 | 433 | 438 | 438 | 438 | 438 | 438 |
| Wheelbase | 1,060 | 1,092 | 1,121 | 1,163 | 1,180 | 1,197 | 1,230 | 1,261 |
| BB drop | 38 | 45 | 45 | 60 | 60 | 60 | 60 | 60 |
| BB height | 302 | 313 | 313 | 308 | 308 | 308 | 308 | 308 |
| Fork offset | 40 | 42 | 42 | 46 | 46 | 46 | 46 | 46 |
| Trail | 104 | 110 | 110 | 110 | 110 | 110 | 110 | 110 |
| Standover | 650 | 658 | 692 | 747 | 759 | 771 | 791 | 816 |
| Seat tube (method not stated) | 320 | 340 | 370 | 420 | 435 | 450 | 500 | 540 |
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 Marlin 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 544/365 mm in size XXS to 651/520 mm in size XXL). 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 Marlin in size M?
Stack of 609 mm and reach of 440 mm, with an effective top tube of 615 mm and a head angle of 66.5°.
Is the Marlin a racing or an endurance bike?
In between. In size M its stack-to-reach ratio is at percentile 52 of mtb bikes: neither very low nor very tall.