Trek session 8 29 gx

$5,499.99 Sale Save
Color SATIN TREK BLACK
Size R1

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Session 8 is a downhill mountain bike with a burly alloy frame and high-pivot suspension design that keeps you nimble, planted, and blazing fast on even the most punishing runs.
  • The suspension layout with a high pivot and idler pulley increases traction, carries more speed, and reduces pedal kickback for more stability
  • Virtually zero pedal kickback means you’ll stay confidently planted and in control during descents—especially when landing jumps or drops
  • The high pivot design delivers a more efficient rearward axle path so you’ll carry more speed and your wheel won’t get hung up on obstacles
  • Adjust your suspension progression by flipping the lower shock mount chip—20% for plush park rides, 25% for racing efficiency
  • Our DH sizing system is based on reach, not rider height, which is the most important factor in a great downhill bike fit

All speed, no hang-ups

Session’s high-pivot design results in a rearward axle path that lets the back wheel move with the rearward force from bumps, not against it. On the trail, it feels like smoother suspension that maintains more forward momentum and provides more grip.

Rock the mullet

Session comes stocked for speed with 29er wheels, but party-in-the-back riders can run a mixed set up with a 27.5˝ rear wheel, or even 27.5" front and rear for more agility.

Tune for your trail

With Mino Link adjustments on both geometry and suspension, you can easily tune your Session to a progressive feel for racing days or dial it back for park days.

Reach-based sizing

When it comes to DH bikes, your reach affects your fit and ride quality far more than seat tube length. We’ve based Session’s sizing on reach to ensure you can find the set up that’s right for you.

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.

Size-specific chainstay length

The chainstay length, or rear center, grows as the frame reach grows so you get balanced weight distribution no matter your frame’s size. High-speed control and big mountain fun for everyone.


Frame Alpha Platinum Aluminum, high main pivot, idler pulley, integrated frame protection, internal or external routing, magnesium rocker link, Mino Link, ISCG 05 2-bolt mount, Active Braking Pivot, 157x12mm thru axle, 200mm travel
Fork RockShox Boxxer, DebonAir+ spring, Rush RC damper, 52mm offset, BoostDH 110x20 Maxle Stealth, 200mm travel
Shock Marzocchi Bomber, 400lb spring, 250mm x 72.5mm
Wheel Front Bontrager Line DH 30, Tubeless Ready, 6-bolt, 110x20mm Boost thru axle, 29 /
Wheel Rear Bontrager Line DH 30, Tubeless Ready, Rapid Drive 108, 6-bolt, Shimano 7 speed freehub, 157x12mm thru axle, 29
Tire Bontrager G5 Team Issue, wire bead, 2-ply 60 tpi, 29x2.50
Rim Strip Bontrager TLR
Skewer Rear Bontrager Switch thru axle, removable lever
Shifter SRAM GX DH, 7 speed
Rear Derailleur SRAM GX DH, medium cage
Crank Truvativ Descendant DH, DUB 83, 34T steel ring, 165mm length
Bottom Bracket SRAM DUB, 83mm, BSA threaded
Cassette SRAM PG-720, 11-25, 7 speed
Chain SRAM PC-1110, 11 speed
Brake SRAM CODE Bronze 4-piston hydraulic disc // SRAM CODE Bronze 4-piston hydraulic disc
Brake Rotor SRAM CenterLine, 6-bolt, round edge, 220mm // SRAM CenterLine, 6-bolt, round edge, 200mm
Pedal Wellgo BO-87B, alloy body, Cro-Mo axle, replaceable pins
Saddle Bontrager Arvada, hollow chromoly rails, 138mm width
Seatpost Bontrager Rhythm Elite, 31.6mm, 0mm offset, 330mm length
Seat Collar Bolt-on, 36.4mm
Handlebar Bontrager Line, alloy, 35mm, 27.5mm rise, 780mm width
Stem Bontrager Line Pro, 35mm, Direct Mount, 50mm length
Headset FSA Orbit, sealed cartridge bearing, 1-1/8 top, 1.5 bottom (includes geometry adjust angled cups)
Grips Bontrager XR Trail Elite, nylon lock-on

Geometry Chart

B B Drop 1.2
B B Height 35.9
Chainstay Length 43.5
Eff Seat Tube Angle 77.1°
Eff Top Tube 58.6
Frame Reach 44.7
Frame Size Letter R1
Frame Stack 63.4
Head Angle 63.6°
Head Tube Length 11.7
Offset 4.6
Position High
Seat Tube 42.5
Seat Tube Angle 61.6°
Standover 75.5
Trail 13.1
Wheelbase 124.3
Wheel Size 29"
B B Drop 1.2
B B Height 35.9
Chainstay Length 44.1
Eff Seat Tube Angle 77.1°
Eff Top Tube 61.7
Frame Reach 47.2
Frame Size Letter R2
Frame Stack 63.4
Head Angle 63.6°
Head Tube Length 11.7
Offset 4.6
Position High
Seat Tube 42.5
Seat Tube Angle 61.6°
Standover 75.9
Trail 13.1
Wheelbase 127.4
Wheel Size 29"
B B Drop 1.2
B B Height 35.9
Chainstay Length 44.8
Eff Seat Tube Angle 77.1°
Eff Top Tube 65.2
Frame Reach 49.9
Frame Size Letter R3
Frame Stack 63.4
Head Angle 63.6°
Head Tube Length 11.7
Offset 4.6
Position High
Seat Tube 42.5
Seat Tube Angle 61.6°
Standover 75.7
Trail 13.2
Wheelbase 130.9
Wheel Size 29"