Diamondback Micro Viper 12" Boys' Bike
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With training wheels that you can take off once your rider learns to balance, the Diamondback Micro Viper 12 in. kids' bike offers a durable design for little ones eager to pedal on their own.
Shop similar productsKey Details
- Sturdy steel frame and fork are built to handle the rigors of riding
- Single-speed drivetrain with protective chainguard offers simplicity and low maintenance
- Rear coaster brake makes it easy for kids to stop; all they have to do is backpedal to engage the brake
- 12 in. wheels are outfitted with all-terrain Comp III tires for performance on and off the road
- The Diamondback Micro Viper 12 in. kids' bike includes a set of heavy-duty, removable training wheels to get new riders started on the basics of balance
- 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 | Recreational Cycling |
|---|---|
| Frame | High-tensile steel |
| Bike Suspension | No Suspension |
| Fork | High-tensile steel |
| Crankset | 1-piece steel, 28t |
| Bottom Bracket | 9-piece Loose Ball |
| Brake Type | Coaster |
| Brakes | Coaster brake |
| Rims | Alloy |
| Front Hub | Steel, 16h |
| Rear Hub | Steel, 16h |
| Wheel Size | 12 inches |
| Tires | Comp III Style, 12 x 2.125 |
| Handlebar Shape | BMX Bar |
| Handlebar | Hi-Ten Steel 2-place |
| Stem | Steel 2-bolt quill |
| Seat Post | Alloy |
| Saddle | DB Jr Padded |
| Pedals | Resin platform |
| Headset | Threaded steel |
| Chain | KMC Z410 |
| Weight | 18 lbs. 12 oz. |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Boys' |
| 12 IN | |
|---|---|
| Effective Top Tube | 303 |
| Seat Tube Center-Top | 155 |
| Standover Height | 354 |
| Head Tube Length | 100 |
| Head Tube Angle (degrees) | 71 |
| Seat Tube Angle (degrees) | 71 |
| Wheelbase | 576 |
| Chainstay | 230 |
| Fork Offset | 33 |
Sizing Notes
Measurements are stated in millimeters unless otherwise indicated.
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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Customer Images
Awesome 1st bike!
This bike is great for your little dude! My son is a little over 2 years and he loves his bike. It's a great 1st bike. He always wants to get on it, he has a great time on it and there's plenty of room for adjusting to his growth spurts. I recommend this highly, I will continue to buy diamond backs as he grows. It was the brand I grew up riding, so, always a brand to rely on for quality.
Average quality
Bought for a 3 year old coming off a balance bike. After riding for 1 day, we made the following observations. The build quality of this bike was poor at best. The crank had tight spots as it was rotated that resulted in more effort than should have been necessary to pedal. The wheels were both slightly wobbly (out of round side to side). The bike itself is very heavy, almost half the weight of the child which makes it hard to pedal, especially on sloped ground. The seating was too tall and the bike has too short a frame/wheel base. Bad ergonomics that made it difficult to ride. Ended up returning the bike and purchased a much higher quality (and 3x the price) aluminum bike from a different manufacturer and supplier. The new bike worked perfect and we were able to completely skip training wheels. After this experience I would recommend buying a bike that is light with a properly sized frame and skip training wheels if the child is comfortable on a balance bike. It only took an hour or two helping out and the our child was off riding without assistance like he had been doing it for years.
His first bicycle.
My little son loves this bike, and even more so when he let go of his tricycle to learn his new bike. It's safe, bike is built quality, has a chain guard, reflectors, and training wheels. It's a very nice transition-to bike.
Perfect for...
Bought this bike because my 5 year old was struggling to get off the training wheels with his 16” bike and it worked flawlessly! On his first day he was able to go almost 100 yards without the training wheels. The second day he was riding without any help!
Great first bike
Love the brand and color. Cant wait for my son to use it.