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2018

Roscoe 8

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$1,259.99 Model 21583
Roscoe 8 is a trail hardtail for anyone looking to have some serious fun out in the dirt. Its 27.5+ mid-fat tires and 120mm suspension fork make it a blast on every trail, from packed singletrack to the loose stuff. It's a laid-back trail mountain bike dressed in a high-quality spec that's ready to party.
Roscoe 8 is a trail hardtail for anyone looking to have some serious fun out in the dirt. Its 27.5+ mid-fat tires and 120mm suspension fork make it a blast on every trail, from packed singletrack to the loose stuff. It's a laid-back trail mountain bike dressed in a high-quality spec that's ready to party.
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It's right for you if...

You want to have fun. You're searching for a playful trail bike with high-quality parts so that when you're out on the trail, the only thing you have to worry about is your face hurting from smiling too much. You prefer plus-size tires for confidence on even the loosest and nastiest trails.

The tech you get

Roscoe 8 features a strong Alpha Gold Aluminum frame, confidence-inspiring 27.5+ tires mounted to extra-wide rims, and a 120mm RockShox Judy TK Solo Air fork. Plus, a dropper post, a SRAM NX 1x11 drivetrain, Shimano M315 hydraulic disc brakes, and a wide handlebar and short stem for more control.

The final word

High-quality components for high-quality trail days. It's all about fun, but it's also all about performance. With an 11-speed drivetrain, hydraulic disc brakes, wide handlebars, and 27.5+ wheels, this bike takes trail riding shenanigans seriously.

The Walkthrough

2018 Family Roscoe 78

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˝ tires can deliver confidence, traction, and stability
  3. The RockShox Solo Air fork can easily be adjusted for a specific rider weight, and it's lighter than a coil spring
  4. The dropper post lets you lower your saddle on the fly so its out of the way on descents
  5. The shifter-style, underbar remote dropper post lever is super intuitive and easy to use

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Features

Specifications

  • Frameset

    Frame
    Alpha Gold Aluminum, E2 tapered head tube, internal derailleur & dropper post routing, rack & kickstand mount, Boost141, G2 Geometry
    Front suspension
    RockShox Judy Silver TK, Solo Air spring, preload, rebound, TurnKey hydraulic lockout, E2 tapered steerer, G2 Geometry w/51mm offset, Boost110, 120mm travel (13.5: 100mm travel)
  • Wheels

    Front hub
    Formula Alloy DC511, Boost110
    Rear hub
    Formula DC2241 alloy, Boost141
    Rims
    SUNringlé Duroc 40 SL 28-hole, tubeless strips and valves sold separately
    Tires
    Schwalbe Rocket Ron Performance, tubeless, aramid bead, 27.5x2.80˝
  • Drivetrain

    Shifters
    SRAM NX, 11 speed
    Rear derailleur
    SRAM NX, Roller Bearing Clutch
    Crank
    SRAM NX, 28T Direct Mount X-Sync
    Bottom bracket
    Sealed cartridge
    Cassette
    SRAM PG-1130, 11-42, 11 speed
    Chain
    SRAM PC-1110
    Pedals
    Wellgo nylon platform
  • Components

    Saddle
    Bontrager Evoke 1.5
    Seatpost
    Dropper post, Bontrager lever, 31.6mm, internal routing
    Handlebar
    Bontrager alloy, 31.8mm, 15mm rise
    Grips
    Bontrager Race Lite, lock-on
    Stem
    Bontrager Rhythm Comp, 31.8mm, 0 degree
    Headset
    Semi-integrated, 1-1/8˝ top, 1.5˝ bottom
    Brakeset
    Shimano M315 hydraulic disc
  • Weight

    Weight
    17.5" - 13.93 kg / 30.70 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

The charts below show our recommended sizes based on height, but there are some other factors, like arm and leg length, that determine a great fit. That’s why you’ll see some overlap in our recommendations. Not every rider who’s 5´8˝, for example, will fit on the same size bike. The best way to find your perfect fit is to consult the experts at your local Trek retailer.

 

Rider Height

All measurements provided in cm unless otherwise noted.

Frame size number 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 Frame rise
15.5 in 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 61.3
17.5 in 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 61.3
18.5 in 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 61.3
19.5 in 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 62.3
21.5 in 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 64.1
23 in 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 64.1

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