Size Guide
89 reviews
Speed Silver
Power Purple
Braap Blue
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Speed Silver: ETA May 2021
Power Purple: ETA May 2021
Braap Blue: ETA May 2021

Wheel Size
20 inches
Approx. Age Range
5 to 9 years

Easy Shifting
RAPIDFIRE+ shifter &
Smart Cage Derailleur

$29 Shipping
in the Continental USA
Checked and Tuned
Each bike is checked & tuned prior to shipment.
Easy Assembly
Includes all the tools you need & easy instructions.
1% for the Planet
Prevelo donates 1% of sales to planet worthy causes.
The 20" Alpha Three is our smallest geared bike. The 8-speed Shimano drive train and 11-34T wide range gearing is the real deal and gives growing riders truly usable gear range. It features:
  1. Prevelo confidence inspiring low and narrow geometry. Prevelo geometry keeps the rider low, balanced and in control.
  2. Lightweight 6061 aluminum frame with custom formed tubing.
  3. Lightweight aluminum alloy fork with chromoly steerer.
  4. Tektro front and rear v-brakes.
  5. Lightweight Allen head front and rear wheel skewers for secure wheel installation.
  6. Three piece crank with squared taper cartridge bearing bottom bracket and ultra narrow Q factor.
  7. Custom made cranks. All Prevelo cranks are sized specifically for each model bike, down to the millimeter.
  8. Shimano ALTUS 8-speed drivetrain. This 8-speed derailleur has a SHIMANO Smart cage. This unique pulley cage permits the use of a shorter pulley cage without comprising gear ratio width. Because kids’ bikes have small wheel diameters, rear derailleurs on kids bikes hang low and close to the ground. The Prevelo Alpha bikes use Smart cage derailleurs to keep things high and away from the ground.
  9. Shimano ACERA RAPIDFIRE Plus Shift Lever. Small hands have a hard time using twist shifters. We use reliable silky smooth thumb shifters. They are easy for small hands to operate, have an indicator display, and operate just like shifters on high performance bikes.
  10. 95% assembled. Just install the handlebar, seatpost, front wheel and pedals.


Kid Centric Features

kids sized bicycle crank

Kid Engineered Crank

kids bike wide span gearing

8 Speed Shimano Drivetrain with Wide Span Gearing

bicycle internally routed cables

Internally Routed Cables

prevelo kid size brake and shift levers

Kid Size Hand Brakes and Easy to Use Shimano Rapidfire Shifters




Sealed Bearings

tool less seat post clamp

Quick Adjust Seat Height

prevelo alpha three silver

Built Kid Tough

girl riding bike

Confidence Inspiring Geometry


girl riding bike



Customer Reviews
4.9 Based on 89 Reviews
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Filter Reviews:
Nandan D.
United States United States
2nd Prevelo and equally happy.

2 years ago, we got our son his first Prevelo, the Alpha One on his 3rd birthday.  Now we were ready for the Alpha Three for his 5th birthday (he's 44" tall, 47lbs).  We called and were told that they were out of stock and supply chain disruptions meant that we would not have one before his 5th birthday.  We were very sorry to hear this, though understandable in the global scheme of things during Covid. A few days later, we received a surprise email from Sarah saying they found one in their stock and it was the exact color we were looking for and were we interested.  Of course we were, we ordered it, and it was delivered exactly as promised. So as usual, Prevelo met and exceeded our expectations when it came to customer care.   The bike itself was great -- beautiful, easy to setup, instructions were obvious and all tools provided.  Our son had no problems riding it right away.  It was easy to handle, at the lowest seat height, he could put both his feet on the ground without any problems which is comforting.  The shifters were also fine, and he can shift both up and down comfortably.  We have gone on 6-7mile bike rides over both paved and unpaved terrain the bike handles all that very well. So bottom line, great bike, great company and good customer care.  

Prevelo Bikes Alpha Three ReviewPrevelo Bikes Alpha Three ReviewPrevelo Bikes Alpha Three Review
Steven R.
United States United States
Awesome bikes!

My 6yo loves his new alpha 3, in blue. Super well built, and will last for awhile. Customer service is top notch too. We originally ordered the wrong color, and prevelo took care of us. Recalled the wrong colored bike after it shipped, and sent out the blue one super fast. Happy all around.

Prevelo Bikes Alpha Three ReviewPrevelo Bikes Alpha Three Review
United States United States
BUY IT!!!!!: Best bikes for small kids, awesome customer service

The Alpha 3 bike is probably the only 20" bike in the market that fits kids with an inseam of 18 inch. My 5 year old has been biking without training wheels since he was 3, so he's been ready for a bigger bike with gears for a long time. After doing some research, I found the Alpha 3, we bought it and I can't be happier. It fits him perfectly and he is the happiest kid in the world.It is also light enough that he can lift it without help. We got the bike with the rapid fire+ shifter as recommended, and it's been great. He got the hand of it pretty quickly. We will not be buying other bikes for our kids. Bike was very easy to put together (literally took us 10 min) and customer service is great, they are very responsive and helpful. We even got a handwritten note with the bike thanking us for buying the bike!!

Casey W.
United States
Magic Bikes

I have a daughter that is very small for her age and Prevelo bikes are sized perfect for her. My seven year old daughter had grown out of her 16” Bike but when she got on her older sister’s 20” Bike she was super stretched out and super uncomfortable and scared. Enter the Alpha 3. Since we got it she has had a seamless transition to the larger sized bike. Jacob definitely has the magic touch when it comes to the dimensions on these bikes. The brake levers are adjustable for small hands and the gear range is great for climbing the hills around our house. I now own 3 Prevelo bikes and have zero regrets. If you want your kid to enjoy riding, buy one of these and you will get much more enjoyment than tears.

United States
Great bike, great purchase.

Had some anxiety about this purchase-that completely went away when I saw the quality of this bike and most importantly how much my son loves it. Worth it. By a long shot. I have a fairly confident rider that started on a balance bike at 2, and never had training wheels. But, I wouldn't describe him as a shredder and honestly was just kind of indifferent about riding. Well, he is all about his Alpha 3 24/7. Wants to ride as soon as he gets out of bed. Picked up the gears and hand brakes quickly, w/in minutes. We have logged a couple miles every afternoon for a week..As a gearhead myself, I am very impressed with the quality and build of this bike. Just can't say enough good things about it.

Prevelo Bikes Alpha Three ReviewPrevelo Bikes Alpha Three ReviewPrevelo Bikes Alpha Three Review