Cannondale Catalyst 4 27.5 Bike - 2018

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Slake your thirst for off-pavement adventure aboard the Cannondale Catalyst 4 27.5 bike. A light alloy frame, sporty riding position and wide-range gearing let you head for the hills with confidence.

  • Features

    • Lightweight aluminum frame delivers a refined, nimble feel; SAVE rear triangle, flattened seat and shaped chainstays absorb bumps for a smooth ride
    • Fast and fun 27.5 wheels deliver a combination of agility and control
    • Front suspension, disc brakes and integrated rack and fender mounts let you take on all kinds of terrain
    • Specs and images are subject to change


    This bike comes with Coast to Coast Support, which includes:
    • 1 year of free adjustments (see more below)
    • In-store bike assembly
    • Pickup in store or curbside
    • Bike experts available at 170+ bike shops
    REI Co-op Members get more:
    • Free flat tire repairs (labor only; parts not included)
    • 20% off shop services
    More about our free adjustments:
    New bikes go through a normal break-in period, after which they should be readjusted. All bicycles sold at REI include free adjustments for one year after purchase date—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation and chain lubrication. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.

    View all Cannondale Hardtail Mountain Bikes
  • Technical Specs

    Best Use

    Mountain Biking

    Mountain Bike Style



    SmartForm C3 alloy

    Bike Suspension

    Front Suspension


    SR Suntour M3030-27

    Fork Travel

    75 millimeters


    Prowheel, 24/34/42

    Bottom Bracket

    Semi-cartridge type, square taper, BSA, sealed bearing


    Shimano EF41 Easyfire, 3 x 7-speed

    Front Derailleur

    Shimano Tourney, 31.8 clamp

    Rear Derailleur

    Shimano Tourney, 7-speed

    Rear Cogs

    Sunrace, 14-34, 7-speed

    Number of Gears

    21 gear(s)

    Brake Type

    Mechanical Disc Brake


    Jak-7 cable-actuated disc, 160/160mm

    Brake Levers

    Shimano EF41


    DC 6.0, double wall, 32-hole

    Front Hub

    Alloy disc

    Rear Hub

    Freewheel, sealed, loose ball bearings, QR, 32h

    Wheel Size

    27.5 inches



    Tire Width

    2.1 inches

    Handlebar Shape

    Riser Bar


    Alloy, 25mm rise, 700mm, 31.8


    Alloy, 31.8, 8

    Seat Post

    Alloy, micro-adjust, 27.2 x 350mm


    Cannondale Stage 2


    Cannondale Platform


    Semi-integrated, threadless, 1-1/8 in.


    KMC Z51, 7-speed


    31 lbs. 12.8 oz.

    Bike Weight

    Bike weight is based on median size, as sold, or the average of two median sizes.



  • Size Chart

    Height Range5'2" - 5'6" 5'6" - 5' 10" 5'10" - 6'1" 6'1" - 6'4"
    Effective Top Tube59.56163.365
    Seat Tube Center-Top38.
    Standover Height75.378.681.885.8
    Head Tube Length1011.513.516
    Head Tube Angle (degrees) 70° 70° 70.5° 70.5°
    Seat Tube Angle (degrees)73° 73.5° 73.5° 74°
    Bottom Bracket Height 30.5 30.5 30.5 30.5
    Fork Offset4.

    Sizing Notes

    Measurements are stated in centimeters unless otherwise indicated.

    How we measure bikes

    1. Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
    2. Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
    3. Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
    4. Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
    5. Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
    6. Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
    7. Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
    8. Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
    9. Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
    10. Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
    11. Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
    12. Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.
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