Session AL 27.5 Frameset | Trek Bikes

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  • Session AL 27.5 Frameset
2019

Session AL 27.5 Frameset

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$2,199.99 Model 24517

Session AL 27.5 frameset is a burly alloy downhill mountain bike frame that's equally at home between the tape and at the DH park. It's built for 27.5˝ wheels, with 210mm of travel and a FOX Performance VAN shock tuned by Trek Suspension Lab.

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It's right for you if...

You're looking to build a rugged DH or park bike for the biggest trails out there, and want a 27.5˝-optimized frameset with exclusive trail tech, like adjustable Mino Link geometry, that can't be found anywhere else.

The tech you get

A burly Alpha Platinum Aluminum frame, an adjustable FOX Performance shock with 210mm of travel, integrated frame protection, FSA Orbit headset, and exclusive trail tech like ABP, Full Floater, and Mino Link. Built for 27.5˝ wheels.

The final word

This burly frameset is perfectly capable of taking on the roughest, fastest descents you can find, and it's equally at home in the park, too. The best DH frame tech, a stable geometry, and a quality shock give you a head start on your dream downhill rig.

The Walkthrough

favorite_borderWhy you'll love it

  1. Session has the heart of a monster truck: it rolls over everything, gives you the confidence to take on rougher trails, and saves you when you don't take the right line
  2. Quality FOX Performance suspension and our ABP frame design keep you in control
  3. Race or get rowdy? This bike does both
  4. 27.5 wheels are great for flicking the bike around through the most technical trail

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Features

Suspension Calculator

This suspension calculator will help you optimize your suspension settings for your riding weight. Simply follow the steps to find your best set up.

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ABP

Our patented Active Braking Pivot allows your suspension to work freely whether you’re on the brakes or off. It’s smooth, controlled suspension that’s at its best all the time.

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Alpha Platinum Aluminum

Our premium lightweight aluminum is continuously cold extruded and butted at multiple points, and hydroformed into sophisticated tube shapes for maximum strength and minimum weight.

Integrated frame protection

Integrated guards protect top tube from dual-crown fork stanchion impact, and down tube from trail debris. Down tube guard is removable, allowing riders to shed valuable grams on race day, or to replace the guard as necessary.

Mino Link adjustable geometry

Fine tune head tube angle by 1/2° and BB height by up to 10mm with the simple turn of a nut. Just flip the link to choose between slack or slacker geometry, without negatively affecting suspension performance. A Trek exclusive.

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Specifications

  • Frameset

    Frame
    Alpha Platinum Aluminum, ABP, Full Floater, EVO Link, tapered head tube, Mino Link, integrated frame protection, internal control routing, MicroTruss, down tube guard, ISCG Mount, 210mm travel
    Rear suspension
    Fox Performance VAN, externally adjustable rebound and low-speed compression; (S 400lb; M 450lb; L 500lb; XL 500lb spring), tuned by Trek Suspension Lab, 8.75x2.75˝

  • Components

    Headset
    FSA Orbit, sealed cartridge bearing, 1-1/8˝ top, 1.5˝ bottom

  • Weight

    Weight
    M - 4.22 kg / 9.3 lbs
    Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider, and cargo) of 300 pounds (136 kg).
We reserve the right to make changes to the product information contained on this site at any time without notice, including with respect to equipment, specifications, models, colors, and materials.
Bike and frame weights are based off Trek pre-production painted frames at time of publication. Weights may vary in final production.

Sizing & fit

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.

 

Rider Height

Inseam

All measurements provided in cm unless otherwise noted.

Frame size letter Geometry position Wheel size A — Seat tube B — Seat tube angle C — Head tube length D — Head angle E — Effective top tube F — Bottom bracket height G — Bottom bracket drop H — Chainstay length I — Offset J — Trail K — Wheelbase L — Standover M — Frame reach N — Frame stack
L Low 27.5" 45.6 57.0° 11.5 63.6° 61.8 35.6 -0.1 44.5 5.2 11.8 122.7 78.4 42.6 60.7
L High 27.5" 45.6 57.6° 11.5 64.2° 61.4 36.4 0.9 44.3 5.2 11.4 122.9 79.0 43.2 60.3
M Low 27.5" 42.6 57.0° 11.5 63.6° 59.4 35.6 -0.1 44.5 5.2 11.8 120.3 79.0 40.2 60.7
M High 27.5" 42.6 57.6° 11.5 64.2° 59.0 36.4 0.9 44.3 5.2 11.4 120.5 79.3 40.8 60.3
S Low 27.5" 42.6 57.0° 11.5 63.6° 57.4 35.6 -0.1 44.5 5.2 11.8 118.3 80.4 38.2 60.7
S High 27.5" 42.6 57.6° 11.5 64.2° 57.0 36.4 0.9 44.3 5.2 11.4 118.5 81.0 38.9 60.3
XL Low 27.5" 45.6 57.0° 11.5 63.6° 64.2 35.6 -0.1 44.5 5.2 11.8 125.1 76.7 45.0 60.7
XL High 27.5" 45.6 57.6° 11.5 64.2° 63.8 36.4 0.9 44.3 5.2 11.4 125.3 77.5 45.6 60.3

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