Session C 29 F/S M Viper Red

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While the rest of the industry was mucking about with 29˝ DH bike prototypes for professional mountain bike racers, we brought the party to the people with our first production 29er downhill bike. Session C 29 frameset pairs fast-rolling 29er performance and our proven downhill frame technology. Its long, stable, and aggressive, with a geometry dialed for your fastest runs ever.
  • We put a whole lot into this bike, including nearly a decade of research and development by engineers and designers who wanted to break the mold of DH capability and speed—and they succeeded
  • Session 29 is taking downhill to a new place, and its leading the charge on the World Cup circuit among the very first 29er DH bikes
  • Mino Link and fixed-angle headset cups let you adjust your geometry for the exact handling you want

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.

OCLV Mountain Carbon

Treks mountain-specific carbon fiber is tougher carbon, with unique materials and layup procedures, Treks advanced engineering, and a higher standard of testing.

Looks like a World Championship

Trek Factory Racings Reece Wilson charged his way into the rainbow jersey aboard Session this year, taking all the right risks on a slick course and carving his name in Downhills history books with a truly gutsy run.


Frame OCLV Mountain Carbon main frame & stays, tapered head tube, integrated frame protection, Control Freak internal routing, magnesium rocker link, Mino Link, ISCG mount, ABP, 12x157mm thru axle, 190mm travel
Shock RockShox Super Deluxe Ultimate DH, RC damper, 225mm x 70mm
Skewer Rear Bontrager Switch thru axle, removable lever
Headset FSA Orbit, sealed cartridge bearing, 1-1/8 top, 1.5 bottom (includes geometry adjust angled cups)

Geometry Chart

B B Drop 1.6
B B Height 35.6
Chainstay Length 45.2
Eff Seat Tube Angle 73.6°
Eff Top Tube 60.1
Frame Reach 41.9
Frame Size Letter M
Frame Stack 61.6
Head Angle 62.6°
Head Tube Length 11.5
Offset 5.8
Position High
Seat Tube 42.5
Seat Tube Angle 57.1°
Standover 74.2
Trail 12.8
Wheelbase 124.7
Wheel Size 29"