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Session 8 27.5

$5,799.99 Model 24507

Session 8 is the DH mountain bike with a park-focused geometry that shines on big hits at the bike park. It's built with a burly aluminum frame, 200mm/210mm front and rear RockShox suspension, and a SRAM GX DH parts group chosen to stand up to the roughest lines you can find.

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It's right for you if...

You're a regular on the lifts and at the bike park. You're looking for a playful, versatile, durable DH rig with proven performance and a park-ready geometry, and want a lot of tech for your money.

The tech you get

An Alpha Platinum Aluminum frame, 200mm/210mm RockShox front and rear suspension with an adjustable air fork, Bontrager Line DH wheels, SRAM Guide R brakes, and a DH-specific SRAM GX 7-speed drivetrain. Race, rip, ride. This bike does it all.

The final word

Fast, durable, agile, and stable. Session 8 is fully capable of taking on the gnarliest descents, the biggest jumps, and the burliest trails. It's a versatile, confidence-inspiring ride with the best in DH tech and a geometry that's not so low and long that it doesn't play nice at the park.

favorite_borderWhy you'll love it

  1. Session 8 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. The RockShox suspension paired with our ABP frame design is made to keep you in control
  3. The durable, DH-specific 7-speed drivetrain keeps things simple, so you can focus on shredding and getting rad



  • Frameset

    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
    RockShox BoXXer RC Air, low speed compression, internal preload, Motion Control IS, 20mm Maxle DH, 200mm 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˝
  • Wheels

    Bontrager Line DH 30, Tubeless Ready, Boost 110x20 front, 157x12 rear w/7 speed DH freehub
    Bontrager G4 Team Issue, 27.5x2.35˝
  • Drivetrain

    SRAM GX DH, 7 speed
    Rear derailleur
    SRAM GX DH, Roller Bearing Clutch
    Truvativ Descendant, 36T w/MRP G4 chainguide
    Bottom bracket
    SRAM GXP TM, 83mm
    SRAM PG-720, 11-25, 7 speed
    SRAM PC-1110
    Wellgo BO-87B, alloy body, Cro-Mo axle, replaceable pins
  • Components

    Bontrager Arvada, hollow chromoly rails
    Bontrager Rhythm Elite, 31.6mm, 0mm offset
    Bontrager Line, 35mm, 27.5mm rise, 780 width
    Bontrager XR Trail Elite, alloy lock-on
    Bontrager Line Pro Direct Mount, 35mm clamp, 50mm length
    Head set
    FSA Orbit, sealed cartridge bearing, 1-1/8˝ top, 1.5˝ bottom
    Brake set
    SRAM Guide R hydraulic disc
  • Weight

    M - 17.01 kg / 37.5 lbs (with tubes)
    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

Proper bike fit is essential for best performance and comfort. Any size and geometry measurements shown on trekbikes.com are for general comparison purposes only. To find your perfect fit, visit an authorized Trek retailer, where an expert skilled at sizing will help you find the appropriate bike and size for your individual needs.


Rider Height


All measurements provided in cm unless otherwise stated.

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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