Alpha Four

147 reviews
Speed Silver
Braap Blue
Party Pink
Rapid Red
$19 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.

Loaded with Features Obsessively Thought Out for Kids



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  and the wall (the same place their bicycle seat will be).
  2. Measure the distance from the floor to the top of the book.
Prevelo Bike Inseam Kid

Rider Experience

Children who are learning are more sensitive to bicycle height than children who already know how to ride a bike. If the rider is new we recommend erring on the side of a smaller bike.  If the rider is experienced and confident, it is OK to err on the side of a larger bike.


We include ride age as guidance for our bikes as a quick reference. But because riders of the same age can have very different sizes, inseam is a more reliable size indicator than age.

    ModelMin InseamMax Inseam
    Alpha Zero12½ in16½ in
    Alpha One14 in17½ in
    Alpha Two15½ in22 in
    Alpha Three19 in23 in
    Alpha Four23 in28 in
    Alpha Five25 in30 in
    Zulu One14 in17 in
    Zulu Two16 in22 in
    Zulu Three21 in26 in
    Zulu Four24 in29 in
    Zulu Five25 in31 in

    What the Bike Media is Saying

    "The alpha series from Prevelo are neighborhood bikes that punch above their intended use. The geometry lends itself to ripping up trails as much as it does flying around the cul-de-sac. Everything is spot on from the tires, to the brakes to the handlebars. You will not be disappointed in such a refined kids bike that can do it all very well."

    two wheeling tots

    " The perfect mix of road warrior and basic all-terrain cruiser, the Alpha Four is built with kid-specific geometry for a precise, comfortable fit.....The Prevelo Alpha series is an exceptional line of bikes for eager young riders. Lightweight with a low-center-of-gravity, the Alphas are fun and easy to ride."

    Alpha Four Assembly

    Customer Reviews
    4.9 Based on 147 Reviews
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    Filter Reviews:
      Daniela D.
      United States United States

      Great Bike, quality & customer service!

      The Alpha Four is perfect for our 7 yr old. He loves it and can grow with this bike. It was quick & easy to assemble. The majority of the bike was assembled in the box. We highly recommend Prevelo Bikes!

      United States United States
      • How would you rate the fit? SmallPerfectLarge
      • Rider's age in years 9

      Far Exceeded Expectations

      Quality is unmatched. Upon unboxing, we were presently surprised at the materials, finish, and ease of assembly. My 9-year-old took to the gears easily and said it rides beautifully. We will definitely be able to pass this down to our younger child!

      Kyle O.
      United States United States
      • How would you rate the fit? SmallPerfectLarge
      • Rider's age in years 8

      Prevelo Bikes The perfect platform for a young rider!

      I was amazed by the whole process. The Prevelo team was wonderfully prompt and responsive with all correspondence. Our Alpha 4 arrived much faster than I had anticipated and Wow! What a beautiful bike. The design is perfect for my daughter to be comfortable, in control, and inspired to ride! The bike is light enough for her to be able to control it easily, the shifting is so smooth and effective that she has rapidly learned to use the gears to conquer increasingly difficult terrain in a short time. It has been an amazing experience, I am so grateful that we purchased a Prevelo Bike!

      Justin L.
      United States United States
      • How would you rate the fit? SmallPerfectLarge
      • Rider's age in years 9

      Truly Phenomenal

      My daughter, 9, immediately loved the Prevolo bike over many other options we looked at, as did I. Every part of the purchase was fantastic - from the notifications about order received, shipped, delivered, etc., to the FedEx details for us to track it in greater detail ourselves. The bike was packaged carefully and perfectly. The bike was set up excellently, so re-assembling it was trivially easy and hassle-free. Quality tools were included as well. Having the manual included in the package was wonderful, and being able to also easily find it online from the website was great. And the bike quality is OUTSTANDING. Everything seems well designed, engineered, well made, carefully assembled, thoughtfully packaged, etc. We are very happy customers! I'm now looking at purchasing a second Prevolo for my 6-year-old!

      Prevelo Bikes Alpha Four ReviewPrevelo Bikes Alpha Four ReviewPrevelo Bikes Alpha Four Review
      Melissa M.
      United States United States
      • Fit SmallPerfectLarge
      • Rider's age in years 8

      Love this bike!

      Got the same bike for my 7 year old as I have for my 10 year old (Alpha Four) because we love it so much. My daughter said "this bike is really good. I like this bike better than my old bike because the seat is really comfortable if you're riding a long distance. I think the size is really good and I really like the blue color because it's really shiny" (it IS an awesome blue)! Lightweight, gears are great for her and she figured them out right away and rode up a big hill... All in all an awesome purchase!