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
Backordered: Expected Ship 7 days or less

Speed Silver: Expected to ship Late Oct
Power Purple: Expected to ship Late Oct
Braap Blue: Expected to ship Late Oct

Wheel Size
16 inches

Approx. Age Range
4 to 6 years


No Training Wheels
Optimized for 2 wheels

$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 16" Alpha Two is the perfect bike for 4 to 6 year olds whether they are just learning to ride or are mastering the trails. It features:
  1. Ships with a bonus short seat post for additional height adjustment.  A short seat post and the tool required to change seat post are included!
  2. Prevelo confidence inspiring low and narrow geometry. Prevelo geometry keeps the rider low, balanced and in control
  3. Lightweight 6061 aluminum frame with custom formed tubing.
  4. Lightweight aluminum alloy fork with chromoly steerer.
  5. Tektro front and rear v-brakes with small reach brake levers.
  6. Front and rear hubs with low profile rounded hex bolts and no harsh edged nuts for little legs to knock against.
  7. Three piece crank with squared taper cartridge bearing bottom bracket and ultra narrow Q factor.
  8. Double chain wheel guard.
  9. Custom made cranks. All Prevelo cranks are sized specifically for each model bike, down to the millimeter.
  10. 95% assembled. Just install the handlebar, seatpost and pedals.


What the bicycle media is saying

two wheeling tots logo


Slick, fun, and fast, the Prevelo Alpha Two 16″ kid’s bike will quickly turn any child into a bike enthusiast.

rascal rides logo

You can’t get a nicer 16″ pedal bike

A big thumbs up


Kid Centric Features

Kid Engineered Crank

Rounded Axle Bolts

Internally Routed Cables

Kid Size Hand Brakes



Sealed Bearings

Quick Adjust Seat Height

Built Kid Tough

prevelo confidence

Confidence Inspiring Geometry




Customer Reviews

4.9 Based on 175 Reviews
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Customer Photos
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Filter Reviews:
    Jessica S.
    Canada Canada

    We love this bike!!

    My husband was a bit hesitant with me spending this much on a bike for a 4 year old, but when he saw our son riding on it shortly after arrival, he agreed it was a great purchase! Our son picked up riding quite early due to the fact that he took to a balance bike very quickly when he was small. By 3 he was riding a Strider 14x (14”) with pedals with zero difficulty and it was very apparent he found PURE JOY in riding his bike. I wasn’t happy with the coaster brake set up on the Strider so I decided to upgrade to a 16” with hand brakes this year. After a ton of research, I decided on the Prevelo because of geometry ( my son isn’t really tall or long limbed for his age ) and because of it being one of the lighter bikes I could find. We customized it with some colorful hand grips and a kick stand and they shipped it to Canada in TWO days. I was floored it made it there so fast. He adores his bike and did his first ‘mountain bike’ camp this year. He held his own even with the single gear. The kick stand really prevents him from dropping his bike on the pavement every time he gets off of it (eye roll) and instead he very carefully stands it up using the kickstand. It is really well built, easy for me to adjust and put together. Despite him already putting it through the ringer the way a 4 year old does.. the paint has no scratches or dings yet. Customer service was great, we are seriously considering the trade up club as I don’t see any reason to not go with Prevelo for our next bike!! Thank you guys!!

    Jessica S. verified customer review of Alpha TwoJessica S. verified customer review of Alpha Two
    NANA O.
    United States

    Outstanding client experience

    I needed a bike for our son for his fourth birthday - started my research late but chanced upon Prevelo. Placed my order- however delivery date and demand for the alpha two was backorded . I made a call to Prevelo and after reviewing my order and knowing it was for a birthday . The team ensured my son received his bike before his birthday. My son is 4 years old . We live in manhattan . He practiced on the bike at a football field for 3 days of 60 mins each . Total of 3 hours . He’s already biking to school . Biking sans training wheels . His next bike is undoubtedly being purchased from Prevelo. Thank you to all who made my sons 4TH birthday a great one and cultivating his lifelong love for biking .

    NANA O. verified customer review of Alpha Two
    Bruno A.
    United States

    Perfect first "pedal" bike

    The bike is perfect for our 5 year old who out grew her balance bike towards the end of summer. We got her the bike for Christmas 2018. I assembled the bike the morning of Christmas eve and we placed the bike upstairs after she went to bed at night. The excitement the following morning when she found a bike with PEDALS and NO TRAINING WHEELS!!! Before lunch time arrived on Christmas she was asking to go out to ride her bike so I headed out and adjusted the seat height and ran after her while holding the bottom of the seat. Within 10 mins she was on her OWN!!! Perfect bike for her size. Completely satisfied and she's happy. Second ride on her bike we logged 5 miles on Strava on the nearby rails and trails. We ended up doing the pink hand grips and brass bell to personalize it a little more for her.

    United States

    Wonderful kids bike that will last

    I did a lot of research before deciding to get my 4 year old on the Alpha Two. We didn’t get to try this one because there wasn’t a location that carried the Prevalo bikes near us. But we decided to give it a try after reading the extensive reviews and I do not regret it one bit. They have a 30-day period where you can try it and return it if you aren’t satisfied. I bet you they don’t have anyone returning their bikes. It’s well made, easy to assemble (since it comes fully assembled really) and my 4 year old LOVES it. There’s no way I could take it away now!

    Jace S.
    United States

    Better than expected

    I put a lot of time and way over thought this purchase, and was still surprised at how good this bike is. As an engineer, I have an appreciation for build quality and design that I gained from work experiences. This bike does not disappoint, it's clear that the design and engineering was thought out, and manufacturing processes are well controlled. My son jumped on it took off immediately. He was using a $5 Goodwill Huffy before, to get a taste for pedals, and he was clearly more stable, confident and comfortable on this right away. I was surprised at how noticeable it was. The only adjustment I've made is to bring in the brake lever a little to better match my sons grip. Thanks Prevelo!

    Jace S. verified customer review of Alpha TwoJace S. verified customer review of Alpha TwoJace S. verified customer review of Alpha Two