Size Guide

Prevelo Bike Sizing

Getting your kids the right size bike is important and, fortunately, also easy. You just need two pieces of information about your little rider:

  • Inseam
  • Rider Experience

Measuring Inseam

  1. Have the rider stand against a wall, hold a book between their legs so that it is firmly against their crotch (the same place their bicycle seat will be).
  2. Measure the distance from the floor to the top of the book.

Rider Experience

Children who are learning are more sensitive to bicycle height than children who already know how to ride a bike. For this reason, our recommendations for bicycle sizing vary slightly based on the experience lever of the rider. The chart below takes into account the fact that experienced riders tend to adapt better to a bike that is slightly larger. For this purpose we categorize young riders as either "Learners" or "Pedalers"

  • Learner: riders who either have not yet learned to ride a pedal bike, or are still frequently putting their feet on the ground while riding.
  • Pedaler: riders who can ride confidently and only put their feet down to stop.
Model Wheel
Approx. Rider Age
Learner Inseam
Pedaler Inseam
Alpha Zero 12" 1½ + 12.5 to 16.5
Alpha One 14" 3 to 5 13.5 to 16.5 13 to 16.5
Alpha Two 16" 4 to 6 16.5 to 22
15 to 22 
Alpha Three 20" 5 to 9 20 to 23 17.5 to 23
Alpha Four 24" 7 to 11 24.5 to 28 23 to 28
Zulu Three 20" 5½ to 9 22 to 26 20 to 25
Zulu Four 24" 8 to 11 25 to 29 23 to 29
Speed Silver
Power Purple
Braap Blue

43 Reviews
Speed Silver: In Stock
Power Purple: In Stock
Braap Blue: In Stock

Buy now, ship later - Learn More

Wheel Size
12 inches

Approx. Age Range
1½ + years


Learn without Training Wheels
Designed to Teach Balance

$15 Shipping
in the Continental USA

Shipping Terms

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 Alpha Zero balance bike is the perfect ride to help little ones learn balance before they jump on a pedal bike. It features:
  1. Lightweight 6061 aluminum frame with custom formed tubing.
  2. Lightweight aluminum alloy fork with chromoly steerer.
  3. Tektro rear v-brakes with small reach brake levers.
  4. Front and rear hubs with low profile rounded hex bolts and no harsh edged nuts for little legs to knock against.
  5. 99% assembled. Just install the handlebar.


What the bicycle media is saying

two wheeling tots logo
Exceptional ★★★★★
The ultimate ride for young groms, the Prevelo Zero is superbly built from top to bottom and perfectly suited for adventure.
bike dads logo

Top Pick

Exceeds all expectations

bike and scoot logo


The Alpha Zero is a high-end balance bike for the picky parents who simply want the best bike for their kids.


Kid Centric Features

alpha zero balance bike low standover

Ultra Low Standover Height

alpha zero rounded axle bolts

Rounded Axle Bolts and Sealed Hubs

alpha zero balance bike rear brake

Reverse Mounted Rear V-Brake and Internally Routed Cable

alpha zero handbrake

Real Hand Brake with Kid Size Lever



alpha zero balance bike lightweight aluminum frame

Custom Formed 6061 Aluminum Construction

alpha zero balance bike seat clamp

Quick Adjust Seat Height

alpha zero kid tough

Kid Tough BOXT™ Rear Stays

alpha zero no training wheels

No Training Wheels



Alpha Zero Lifestyle



Customer Reviews

4.9 Based on 43 Reviews
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Customer Photos
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Filter Reviews:
    Ryan W.
    Canada Canada

    Alpha Zero

    Couldn’t be happier with the bike itself and the customer experience. You can really tell Prevelo is kid and customer focused. From the super fast response time to the person touches...these guys are doing it right!

    Ryan W. verified customer review of Alpha ZeroRyan W. verified customer review of Alpha ZeroRyan W. verified customer review of Alpha Zero
    Rochelle B.
    United States

    Exceptional--all around!

    Hi Jacob & the Prevelo Bikes Team, Before I begin, I must apologize for not providing any feedback when we purchased our first Prevelo for our now 3.5-year-old. We LOVE your bikes. I can't recall how I stumbled upon your site, but I have to admit I am beyond grateful and thrilled. We bought the Prevelo One for our oldest daughter, Izzy. She turned three in December and she learned to ride in less than two months. Now, she is cruising and cutting corners like mad(wo)man. Our second daughter, Jacqui turned two on July 16. She watches Izzy with awe, thus we decided to get her a balance bike to get her going. No surprise, she loved it! Your bikes are made with such precision that the height, length, and reach is perfect for their tiny little bodies. We recently had our third child, a boy, this April. (If you are keeping score, yes, we have a 3.5-year-old, a two-year-old, and a 3-month-old.) So expect, the Beverage family to be valued customers for years to come. We appreciate all the thought and work you guys put in making your bikes. We absolutely love everything about them; the ease in putting it together, the craftsmanship, the quality and the sleek design. You guys totally nailed! Hope you all are having an awesome summer! All the best, the Beverage family (Steve, Rochelle, Izzy, Jacqui and Harrison)

    Jenn G.
    United States

    Baby Emma loves her Prevelo

    Best push bike out there! Nicely finished and really good looking. Our baby loves it!


    Amazing Company

    We decided my son needed a bike on 4th of July. The owner welcomed us into his office to test one out, let my 20 month old ride around the back warehouse and answered all of our questions! The bike is amazing, super light and easy for my little guy to pick up and maneuver. Customer service is above expectation. I love that they're a local company to me, and so easily available and ready to help!

    David H.
    United States United States

    Alpha Zero for Eli

    This is a well designed and well built bike made of quality materials. It was a birthday gift for my 2 year old grandson and he loves it. Although he is just starting to learn to ride it, I am sure he will be flying down the sidewalks soon. His 7 month old little brother already has his eyes on it too!

    David H. verified customer review of Alpha Zero