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Young riders graduating to the bike park can get onboard the kids' Early Rider Limited Hellion X20 20 in. bike and take their progressive riding to new levels with better handling and performance.

  • Features

    • 6061 and 6066 aluminum frameset tubing with CNC'd linkage plates and welded dropouts ensure strength and durability
    • Versatile frame can run 16 or 20 in. wheels by replacing the rear dropouts; offers 3.5 in. travel for 16 in. wheels and 4 in. travel for 20 in. wheels
    • RST Spex fork provides 100 mm of reliable front wheel travel
    • DNM rear shock suspension includes rebound adjust and a pedal platform to make pedaling easier on the legs
    • Tubeless-compatible wheelset with folding Vee Crown Gem tires allows space for tires up to 2.4 in. wide
    • 1x10-speed drivetrain with 11-36T rear cog gear range delivers a wide range of gear possibilities
    • Lightweight, actuating Shimano Deore hydraulic brakes ensure reliable and efficient braking control
    • Specs and images are subject to change


    Free Adjustment Period:
    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 Early Rider Limited Kids' Mountain Bikes
  • Technical Specs

    Best Use

    Mountain Biking

    Mountain Bike Style


    Bike Frame Material



    6061 and 6066 aluminum

    Bike Suspension

    Full Suspension


    RST Spex, 100 mm travel

    Fork Travel

    100 millimeters

    Rear Shock

    DNM AO-38RC 52 x 25.4mm rebound adjust, pedal platform


    Samox 127 mm with 30T narrow wide chainring

    Bottom Bracket

    Samox external cup, sealed cartridge bearing


    Shimano Deore SL-M6000 Rapidfire RH 10-speed

    Rear Derailleur

    Shimano Zee M640 SS 10-speed

    Rear Cogs

    SunRace CSMX0 11-36T

    Number of Gears

    10 gear(s)

    Brake Type

    Hydraulic Disc Brake


    Shimano Deore BR-MT500, 160 mm rotors

    Brake Levers

    Shimano Deore BL-MT501


    20 x 28h double-wall 6061 aluminum, pinned, tubeless compatible

    Front Hub

    CNC Straight Pull 6061 aluminum, 15 x 100 thru axle

    Rear Hub

    CNC Straight Pull 6061 aluminum, 12 x 142 thru axle

    Wheel Size

    20 inches


    Vee Crown Gem Tanwall: 20 x 2.25 in., 72 TPI folding

    Tire Width

    2.25 inches

    Handlebar Shape

    Riser Bar


    560 mm RitcheyOS double-butted 6061 aluminum, 18 mm rise


    Ritchey OS forged 6061 aluminum, 35 mm reach

    Seat Post

    Ritchey 20 aluminum, 30.9 x 225 mm


    SDG Fly Jr


    SDG Slater 90


    ER conventional headset with 1-1/8 in. cartridge bearing


    KMC X10


    22 lbs. 8 oz.

    Bike Weight

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



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