Alpha Zero

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
Sold out - but more are on the way!


Ships Late April 2018.

Note: Your credit card will be charged immediately.
You may cancel your pre-order anytime prior to shipment.

Wheel Size
12 inches

Approx. Age Range
1½ + years


Fast and Free Shipping
Orders in by 12 noon PST M-F ship same day.
(except holidays)

Checked and Tuned
Each bike is checked & tuned prior to shipment.

Easy Assembly
Includes all the tools you need & easy instructions.

  • 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.
    Weight 8.5 lbs / 3.8 kg
    Minimum Saddle Height 11.5 in / 292 mm
    Maximum Saddle Height 14.6 in / 370 mm


    A Wheel Size 12"
    B Wheelbase 22.9 in / 581 mm
    C Effective Top Tube Length 11.6 in / 295 mm
    D Head Angle 67°
    E Seat Tube Angle 69°
    F Chain Stay Length 8.9 in / 225 mm
  • Components

    FRAME 6061 heat treated aluminum alloy custom formed tubing
    FORK Aluminum alloy blades with chromoly steerer tube -35mm rake
    SEAT CLAMP Aluminum alloy with toolless adjustment
    REAR BRAKE Tektro aluminum V-brake
    REAR BRAKE LEVER Tektro aluminum short reach
    HEAD SET 1 1/8" threadless
    RIM Aluminum with grinded sidewalls
    FRONT HUB Lightweight alloy 1-piece forged CNC with low profile rounded hex bolts
    REAR HUB Lightweight alloy 1-piece forged CNC with low profile rounded hex bolts
    TIRE & TUBE Kenda 12 x 1.75
    SADDLE Prevelo balance bike specific saddle
    HANDLEBAR Prevelo Aluminum - 375mm wide x 50mm rise - 22.2mm to 19mm taper
    HANDLEBAR STEM Aluminum 30mm extension
    GRIP Kraton rubber

    Custom Color Grips

    Customize your new Prevelo with grips in the rider's favorite color. Made for Prevelo out of 100% silicone by ESI in Southern California.  We will install the grips on your Alpha Zero before shipping.

    custom grip colorsprevelo bike custom grip color


    Rider Name Lettering

    • Custom cut out of 2.5 mil vinyl right here at Prevelo HQ in California and applied to BOTH sides of the bike before shipment.
    • With a bit of work the decal can be removed when it comes time to hand the bike down.



What the bicycle media is saying

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Top Pick

Exceeds all expectations


Kid Centric Features

Ultra Low Standover Height

alpha zero rounded axle bolts

Rounded Axle Bolts

alpha zero internally routed cable

Internally Routed Cables

Real Hand Brake with Kid Size Lever



alpha zero custom formed tubing

Custom Formed 6061 Aluminum Construction

quick adjust seat height

Quick Adjust Seat Height

Built Kid Tough

alpha zero reverse mounted brake

Reverse Mounted Rear Brake



Alpha Zero Lifestyle



Customer Reviews

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  • Reviews (8)

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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!

Eddie J.
United States

Awesome Balance Bike Upgrade

Bought this bike for my son as an upgrade to his previous balance bike. Specifically wanted a handbrake so that he can control speed on downhills. Bike assembly was simple and quick - quality is awesome!

United States

He LOVES it!

My 3 year old son loves this bike. He calls it his motorcycle. He’s been kicking it around for a couple weeks now - it is durable.

Anonymous verified customer review of Alpha Zero
Stephanie B.
United States

Alpha Zero

Wonderful. My son loves it. Keeps telling everyone he sees about his “new bike.” The brake is very helpful too so he doesn’t use his shoes to stop himself anymore!