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Roscoe 9

Model 21618

The Roscoe 9 is our top-end 27.5+ trail hardtail. It's a fun-loving ride with high-performance mountain bike parts that are ready to get rowdy. The mid-fat tyres and burly suspension fork with 120 mm of travel offer an extra dose of confidence to any rider on any trail.

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It's right for you if...

What's Strava? You don't care, because you measure your rides in smiles. You're looking for a fun hardtail with a spec that won't quit. You want a bike you can throw around corners, power up climbs and manoeuvre down tricky descents without ever leaving your line.

The tech you get

The Roscoe 9 features an Alpha Gold Aluminium frame, a RockShox Recon 120 mm fork with beefier legs that won't flex when the trail gets rough and a Shimano SLX/XT 1x11 drivetrain with an extra-low 46-tooth gear. Plus, it has Shimano hydraulic disc brakes, a dropper post, and a wide handlebar and short stem for more control.

The final word

The Roscoe 9 is the best bike in the Roscoe family, and it isn't afraid to get gnarly with its wide tyres and beefy suspension fork. It caters to trail riders who value dependable performance on a 27.5+ bike that they can just hop on and rip up the trail.

favorite_borderWhy you'll love it

  1. It's more fun to be a better rider: Roscoe is so stable and forgiving, it's like an instant ability upgrade
  2. Even when the trail gets rough, the wide 27.5x2.8˝ tyres can deliver confidence, traction and stability
  3. The RockShox Recon fork has more robust 32 mm stanchions for more precise steering
  4. The shifter-style, underbar remote dropper post lever is super intuitive and easy to use



  • Frameset

    Alpha Gold Aluminium, E2 tapered head tube, internal derailleur and dropper post routing, rack and kickstand mount, Boost141, G2 Geometry
    RockShox Recon, Solo Air, TurnKey lockout, rebound, E2 tapered steerer, G2 Geometry w/51 mm offset, Boost110, 120 mm travel (13.5: 100 mm travel)
  • Wheels

    Front hub
    Bontrager sealed bearing, alloy axle, Boost110
    Rear hub
    Bontrager sealed bearing, Boost141
    SUNringlé Duroc 40 SL 28-hole, tubeless strips and valves sold separately
    Schwalbe Rocket Ron Performance, tubeless, aramid bead, 27.5x2.80˝
  • Drivetrain

    Shimano SLX M7000, 11-speed
    Rear derailleur
    Shimano Deore XT M8000, Shadow Plus
    Race Face Aeffect, 28T Direct Mount Narrow-Wide
    Bottom bracket
    Sealed cartridge
    Shimano SLX M7000, 11-46, 11-speed
    KMC X11-1
    Wellgo nylon platform
  • Components

    Bontrager Evoke 1.5
    Dropper post, Bontrager lever, 31.6 mm, internal routing
    Bontrager alloy, 31.8 mm, 15 mm rise
    Bontrager Race Lite, lock-on
    Bontrager Rhythm Comp, 31.8 mm, 0-degree
    Head set
    Semi-integrated, 1-1/8˝ top, 1.5˝ bottom
    Brake set
    Shimano M365 hydraulic disc
  • Weight

    M - 13.52 kg / 29.80 lbs (with tubes)
    Weight limit
    This bike has a maximum total weight limit (combined weight of bicycle, rider and cargo) of 136 kg (300 lb).
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 on Trek pre-production painted frames at the 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 authorised 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 number Frame size letter A — Seat tube B — Seat tube angle Effective 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
13.5 in XS 34.3 73.0° 73.0° 9.0 68.2° 53.2 30.9 6.8 43.8 5.1 9.2 106.7 72.3 36.3 59.8
15.5 in S 36.8 71.0° 71.0° 9.0 68.3° 57.3 31.8 5.8 43.8 5.1 9.1 108.9 75.1 37.6 60.7
17.5 in M 41.9 71.0° 71.0° 9.0 68.3° 60.2 31.8 5.8 43.8 5.1 9.1 111.8 74.7 40.5 60.7
18.5 in ML 44.4 71.0° 71.0° 9.0 68.3° 61.8 31.8 5.8 43.8 5.1 9.1 113.4 74.1 42.2 60.7
19.5 in L 47.0 71.0° 71.0° 10.0 68.3° 63.8 31.8 5.8 43.8 5.1 9.1 115.4 75.7 43.9 61.7
21.5 in XL 52.1 71.0° 71.0° 12.0 68.3° 65.9 31.8 5.8 43.8 5.1 9.1 117.6 75.3 45.3 63.6
23 in XXL 55.9 71.0° 71.0° 12.0 68.3° 67.3 31.8 5.8 43.8 5.1 9.1 119.0 77.5 46.8 63.9

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