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Frameset MTB Trek Session Carbon 27.5'' Viper Red 2017


Size guide

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Frame size / rider height

S / 157-167 cm


Delivered on 18/02

L / 178-187 cm

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Delivered on 18/02


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What size do you need?

Choosing the right sized bike depends on the type of bike, your height, your riding style, and your preference. A correct fitting bike will be more comfortable, more efficient and more fun to ride

Measure yourself accurately

To get started, measure your height and use the size chart available on each product description.

What to do if you are in between bike sizes?

If you are on the edge of two different bike sizes, don't worry, you'll probably be ok on either size (rather than thinking that one size will be awful and the other will fit). Indeed, bikes are adjustable: the seatpost can slide up and down, the saddle can move backwards and forwards and you can even switch out parts like the stem for different sized ones to help the bike fit better.

Finding out whether or not you should pick a bigger or a smaller frame is sometimes as simple as personal preference, but there are a few simple ways to work out which might suit best:
  • If you’re flexible, you might prefer a shorter head tube, so the smaller size might work out better for you. You can use a longer stem to make the reach more comfortable.
  • On a bigger bike, the reach to the handlebars will be longer. This means that if you have proportionally longer arms, you might be more comfortable on a bigger frame.

Still confused? Contact us

The Session 9.9 is the pinnacle of downhill mountain bike performance. It's built for one reason: going as fast as freakin' possible down hills.

It's right for you if...

You want the best downhill bike we offer. You seek out the steepest descents, the fastest lines and the biggest jumps. You like to dial in your ride, and want the ability to fine-tune your suspension, fit and handling on a bike that makes no compromises.

Key Features 

  • This is the same bike ridden by Rachel Atherton, the first mountain biker in history to earn a perfect World Cup season
  • It's like a precision wrecking ball that gives you the confidence to tear down mountains and take the fastest, burliest lines
  • The fastest runs demand the most dialled set-up: the air shock and fork on Session 9.9 are adjustable and easy to fine-tune for different tracks
  • Mino Link and fixed-angle headset cups let you adjust your geometry for your personal handling requirements

Details :

Weight M - 3.27 kg / 7.2 lbs  
Frame OCLV Mountain Carbon main frame and stays, ABP, magnesium EVO Link, E2 tapered head tube, Mino Link, integrated frame protection, Control Freak internal routing, Carbon Armor, ISCG mount, 210 mm travel
Rear suspension Fox DHX2 SLS, rebond réglable rapide/lent, réglage compression à basse/haute vitesse (ressorts S 400 lb ; M 450 lb ; L 450lb ; XL 500 lb), réglé par Trek Suspension, 8,75x2,75 pouces  
Headset FSA Orbit, sealed cartridge bearing, 1-1/8˝ top, 1.5˝ bottom (includes geometry adjust angled cups)

Geometry :

Frame Size (in) S M L XL
Geometry position High High High High
Seat tube (cm) 42.5 42.5 45.6 45.6
Seat angle 56.6° 56.6° 57.5° 54.5°
Effective seat tube angle 74.7° 74.7° 74° 74°
Head tube (cm) 11.5 11.5 11.5 11.5
Head angle 62.1° 62.1° 63° 63°
Projected upper tube (cm) 57.1 59.0 60.9 63.4
Bottom bracket height (cm) 35 35 34.9 34.9
Drop Bottom Bracket (cm) 2.3 2.3 2.3 2.3
Length chain stays (cm) 45.3 45.3 45.3 45.3
Fork offset (cm) 5.1 5.1 5.1 5.1
Wheelbase (cm) 1229 1248 1257 1282
Straddle Height (cm) 73.6 73.6 74.1 74.3
Reach (cm) 39.6 41.5 44.5 47
Stack (cm) 61.9 61.9 61.9 61.9
Frame rise (cm) 61.9 61.9 61.9 61.9



Rear axle 12 x 157 mm Super Boost
Bottom bracket mount BB90 Trek
Gender Not Specified
Frame Caliper Mount Post Mount (PM)
Front derailleur mount ISCG-05
Seat Clamp 34.9
Steerer/Headtube Tapered
Diameter (mm) 31.6




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