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.
Shop similar productsKey Details
Wheel Size
20 inches
Fork Travel
40 millimeters
Number of Gears
6
- 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
- NOTE: Specs and images are subject to change based on component availability
Imported.
This bike comes with Coast to Coast Support, which includes:
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- 1 year of free adjustments (see more below)
- In-store bike assembly
- Pickup in store or curbside
- Bike experts available at 170+ bike shops
- 20% off shop services
- Free tubes with purchase of flat tire repair (Co-op Cycles brand tubes only; tube must be installed at time of purchase)
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.
| 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' |
Diamondback Bikes (109112)
| 20 in | |
|---|---|
| Height Range | 47" - 56" |
| Reach | 307 |
| Stack | 416 |
| Effective Top Tube | 465 |
| Seat Tube Center-Top | 280 |
| Standover Height | 495 |
| Head Tube Length | 100 |
| Head Tube Angle (degrees) | 70 |
| Seat Tube Angle (degrees) | 71 |
| Bottom Bracket Height | 239 |
| Wheelbase | 885 |
| Chainstay | 380 |
| Fork Offset | 37 |
Sizing Notes
Bike measurements are stated in millimeters.
How we measure bikes
- 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.
- Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
- 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.
- 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.
- 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.
- Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
- Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
- Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
- Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
- Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
- Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
- 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.