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
- 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.
- 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' |
| 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.
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good enough
Ask yourself, how into cycling is your son. This will not work if they are trying to keep up with Dad on trails. It must weigh 40lbs(guess) my son is 65 thats like me trying to ride a bike that weighs 100lbs. Not fun. Its good enough for the park, the neighborhood and the sidewalk. My son couldnt dhift or stop this bike at first but it has broken in and hes ok with both now. Good entry level bike but beyond that i gotta say step up and spend more..
Great Purchase
Staff were knowledgable, curtious and set up the bike in not time. Prior to purchasing this specific mountain bike I did alot of online and in store research on what would be the best bang for my buck. And while other top brands were appealing this Diamondback could not be beat, starting with the price and ultimately features.
Dangerous: Comes with Adult sized Brake Levers
My son has no chance of stopping this bike. So far, both REI and Diamondback have been useless about replacing them.
Not nearly the bike it should be.
My son was a picky shopper for this purchase. We saw this bike online and he was in love with the paint scheme. We went into and they didn't have it in stock, but we test rode the Co-op 20' bike. It's only $30 more. Well, my son had no interest in that one, despite feeling it was a great test ride. He's only 7 years old, but a very intense young man. :) He wanted the Diamond Back. We ordered it online and it came. We picked it up in Salem, and went for a 50 minute ride. He could NOT crank the shifter down to gears 1, 2 or 3 with his hand strength. I started inspecting it and notices that the crankshaft had the kind of friction I would expect of a Walmart bike - it was no good. My son was not getting the "low-friction, high speed" thrills he'd come to expect from his $180 Polpo (REI 16" bike) he'd had for a couple years - he was in tears after being so disappointed after shopping so hard. :) Admittedly, we didn't give it a good test ride at the store. Long story short - we returned it for the Co-Op 20" thing he'd ridden before and he loves it and decided the paint was to his liking also. :) If the Co-Op bike is $299, this Diamondback should be half of that, no joke. It's just not the same caliber of bike. The Co-Op is a GREAT bike and my son is in love with it.
Great Entry Level MTN Bike
After a lot of online browsing finally landed on the Octane 20" for a 7th birthday present for my son. He is right at 47", the bottom end recommendation for height on this bike. He is able to maneuver and shift pretty well but the only issue he is having are the brake levers. They are just a little too big for a bike this size. He is however getting used to them. Overall very happy with the product and workmanship. All parts match up with the price point and we are looking forward to some family shredding.