Diamondback Octane 20" Boys' Bike

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Designed for taking around the block and out on the trail, the 20-in. Diamondback Octane is a great next-step bike for kids who are excited to take their two-wheeled adventures to the next level.

  • Features

    • Heat-treated aluminum alloy construction and replaceable derailleur hanger add durability
    • Suspension fork gives a smooth ride
    • Linear pull brakes are simple and strong and easy for kids to use
    • Shimano 6-speed drivetrain gives a wide gear range for varied terrain
    • Specs and images are subject to change

    Imported.

    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 Diamondback Kids' Mountain Bikes
  • Technical Specs

    Best Use

    Cycling

    Frame

    6061 Heat-Treated Aluminum

    Bike Suspension

    Front Suspension

    Fork

    HL Zoom

    Fork Travel

    40 millimeters

    Crankset

    Steel, 40 tooth w/double guard

    Bottom Bracket

    Loose ball

    Shifters

    Shimano RS35 Revo Grip Shift

    Front Derailleur

    n/a

    Rear Derailleur

    Shimano TZ-50, 6 Speed

    Rear Cogs

    Shimano TZ20

    Number of Gears

    6

    Brake Type

    Rim

    Brakes

    Alloy linear pull

    Brake Levers

    Alloy linear pull w/ reach adjust

    Rims

    32h 20" R-1000 alloy

    Front Hub

    32h steel nutted

    Rear Hub

    32h steel nutted, freewheel

    Wheel Size

    20 inches

    Tires

    Jr. ATB knobby

    Tire Width

    1.95 inches

    Handlebar Shape

    Flat Bar

    Handlebar

    Steel Jr Riser

    Stem

    Alloy Quill

    Seat Post

    Steel Pillar, 25.4mm

    Saddle

    Jr. ATB 2-panel

    Pedals

    Resin MTB, 9/16"

    Headset

    Threaded 1 1/8"

    Chain

    KMC Z51, 6 Speed

    Weight

    25 lbs. 11 oz..

    Bike Weight

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

    Gender

    Boys'

  • Size Chart

    20 in
    Height Range47" - 56"
    Reach307
    Stack416
    Effective Top Tube465
    Seat Tube Center-Top280
    Standover Height495
    Head Tube Length100
    Head Tube Angle (degrees)70
    Seat Tube Angle (degrees)71
    Bottom Bracket Height239
    Wheelbase885
    Chainstay380
    Fork Offset37

    Sizing Notes

    Bike measurements are stated in millimeters.

    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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