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  • Session AL 27.5 Frameset
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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 with 210mm of travel with an adjustable FOX Performance VAN shock, integrated frame protection, FSA Orbit headset, and exclusive trail tech like ABP 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.

See it in action

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
  5. Mino Link lets you make small adjustments to your geometry quickly and easily, even mid-ride

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Features

Active Braking Pivot

Active Braking Pivot

Active Braking Pivot allows our engineers to tune how the suspension reacts to acceleration and braking forces independently. That means you get more confident control when you need it most.

Learn more
Suspension Calculator

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.

Learn more
Mino Link adjustable geometry

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.

Learn more
Down tube guard

Down tube guard

Replaceable external shield protects the down tube from trail debris.

Specifications

  • Frameset

    Frame
    Alpha Platinum Aluminum, tapered head tube, internal control routing, integrated frame protection, downtube guard, ISCG 05 mount, magnesium rocker link, Mino Link, ABP, 157x12mm thru axle, 210mm travel
    Max compatible fork travel
    200mm
    Rear suspension
    Fox Performance VAN, 500lb spring, 8.75x2.75"

  • Wheels

    Max tire size
    27.5x2.40"

  • Drivetrain

    Max chainring size
    36T

  • 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
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
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
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
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
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
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
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
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

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