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

206 reviews

For Pre-Orders your credit card will be charged immediately.
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Speed Silver: Sold Out - Next ETA July 2020 - $379
Power Purple: Sold Out - Next ETA July 2020 - $379
Braap Blue: Sold Out - Next ETA July 2020 - $379

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 206 Reviews
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Filter Reviews:
    Josh S.
    United States United States
    An Exquisite Riding Machine

    This bike has changed my son’s life, especially during this trying time. This bicycle is exceptionally well made, beautifully engineered, and real real easy on the eyes. Its gorgeous: clean lines and good proportions. It doesn’t aesthetically talk down to kids. From the gear ratio, to the weighting, to the curves, it’s clear that thoughtful people have constructed an exquisite machine. My son not only adores the bike itself but also the sense of freedom and confidence he has riding it all over city streets, dirt tracks, and soon down the side of a mountain (or so he tells me). Thank you for building machines that bring children joy and parents pride.

    Prevelo Bikes Alpha Two ReviewPrevelo Bikes Alpha Two ReviewPrevelo Bikes Alpha Two Review
    Kai W.
    United States United States
    Best first pedal bike ever!

    Ordered this bike after quite a bit of research on 16 inch pedal bikes for Daughter's Birthday. She had outgrown her balance bike and was more than ready for a pedal bike. Daughter was able to solo ride first time out with the bike and was able to handle 4 mile ride over varying terrain on day 3. This bike handles really well over dirt trail for a new rider. Geometry was perfect for her and a little adjustment to the brakes and she was good to go. This bike is solid while lightweight with great components. Customer service was amazing. I was less than a week out form Daughter's birthday when we finally decided to pull the trigger on the bike. Called to order since the bike was showing as back ordered. Gentleman I spoke to managed to find one in the silver color my daughter wanted and got it shipped first thing Monday. It arrived right on her birthday and she was riding within 2 hours of its arrival. Best customer service ever! Thank you Prevelo for making a very happy kid who loves her bike.

    Tim N.
    United States United States
    Growing with Prevelo

    Back in February of 2018, after a lengthy and at times, confusing research comparing multiple bike companies in search for my son's first pedal bike, I stumbled upon Prevelo Bikes. Prevelo caught my attention because they were purposely researching and building bikes specifically for kids, while using the highest quality parts available. I purchased the Alpha One because it was the lightest and most feature-packed bike I could find for my son's age and size. The freewheel kit made this bike a must have. Other manufacturers did not offer a freewheel kit. My son loved his Alpha one! The bike gave him the confidence to pedal a bike for the first time. I was amazed at the progress he made, going from a timid rider to one that was attempting tricks on his bike. Once my son grew a bit too tall for the Alpha one, there was no question that the Alpha Two was the only bike on my shopping list. I made my Alpha Two purchase in October of 2019 and he is currently loving his bike. He looks forward to riding as much as he can. As for myself, I've found peace of mind in that my search for the best bike possible for my son was made correctly. And with the trade-up club, I see him growing with Prevelo for many years to come. Overwhelmingly satisfied with Prevelo! Tim N. San Jose, CA

    Prevelo Bikes Alpha Two ReviewPrevelo Bikes Alpha Two ReviewPrevelo Bikes Alpha Two Review
    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!!

    Prevelo Bikes Alpha Two ReviewPrevelo Bikes Alpha Two Review
    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 .

    Prevelo Bikes Alpha Two Review