AlphaFour

Wheel Size: 24"
Age: ~7 to 11 years | Inseam: 23" - 28"
131 reviews
Color
Speed Silver
Power Purple
Braap Blue
$29 Shipping (FREE over $500)
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

bicycle crank

Kid Optimized Crank

Prevelo crank lengths are custom sized for each size bike to make sure little riders have optimum pedal ergonomics. And they have ultra-narrow Q-factors to match the narrow hips of young cyclists. If that sounds like technical mumbo jumbo, here's the point - Prevelo cranks will help make small riders more comfortable and efficient on their bike.

Confidence Inspiring Geometry

The Alpha Four features Prevelo's signature confidence inspiring geometry. Prevelo geometry utilizes a low bottom bracket that lowers the center of gravity of the bike and rider, making for a more agile and confident ride.

9 speed microshift

9 Speed Microshift Drivetrain with Wide Span Gearing

9-speed Microshift drive train and 11-36T wide range gearing is the real deal and gives growing riders truly usable and class leading, 327% gear range. Kids are going to be efficient on the flats and have the leverage of low gears available to help make it up tough hills.

kids bike handlebar

Kid Optimized Cockpit

This is where little riders command their steed. It's decked out with ultra thin grips and short reach brake levers that are optimized for small hands. The Microshift shifter is operated with two easy to operate thumb levers.


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."


  • The 24" Alpha Four features a NEW 9-speed Microshift drive train. The 11-36T wide range gearing is the real deal and gives growing riders truly usable gear range. It features:
    1. Prevelo confidence inspiring low and narrow geometry. Prevelo geometry keeps the rider low, balanced and in control.
    2. Lightweight 6061 aluminum frame with custom formed tubing.
    3. Lightweight aluminum alloy fork with chromoly steerer.
    4. Front and rear v-brakes.
    5. Lightweight Allen head front and rear wheel skewers for secure wheel installation.
    6. Three piece crank with squared taper bottom cartridge bearing bottom bracket and ultra narrow Q factor.
    7. Custom made cranks. All Prevelo cranks are sized specifically for each model bike, down to the millimeter.
    8. NEW Microshift 9-speed drivetrain. Uses a shorter pulley cage without comprising gear ratio width. Because kids’ bikes have small wheel diameters, rear derailleurs on kids bikes hang low and close to the ground. The Prevelo Alpha bikes use smaller cage derailleurs to keep things high and away from the ground.
    9. Microshift Trigger Shifters. Small hands have a hard time using twist shifters. We use reliable silky smooth thumb shifters. They are easy for small hands to operate, and operate just like shifters on high performance bikes.
    10. Replaceable derailleur hanger. If the derailleur takes a hard hit, the hanger can be replaced without repair to the frame.
    11. 11-36T wide span gearing gives riders plenty of range to spin up tough hills.
    12. 95% assembled. Just install the handlebar, seatpost, front wheel and pedals.
  • MEASUREMENT SPECIFICATION
    Weight (including pedals) 21.1 lbs / 9.5 kg
    Minimum Saddle Height 25.8 in / 655 mm
    Maximum Saddle Height 31.2 in / 792 mm
    Bottom Bracket Height 9.9 in / 252 mm
    Gain Ratio 2.1 - 6.8
    Standover (ground to top of top tube) 22 in / 558.8mm
  • bicycle geometry
    MEASUREMENT SPECIFICATION
    A Wheel Size 24"
    B Wheelbase 38.1 in / 968 mm
    C Effective Top Tube Length 19.6 in / 498 mm
    D Head Angle 69°
    E Seat Tube Angle 69°
    F Chain Stay Length 16.3 in / 415 mm
  • COMPONENT SPECIFICATION
    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
    FRONT BRAKE Aluminum alloy V-brake
    REAR BRAKE Aluminum alloy V-brake
    FRONT BRAKE LEVER Aluminum alloy
    REAR BRAKE LEVER Aluminum alloy
    REAR DERAILLEUR 9-Speed Microshift
    SHIFTER REAR Microshift Thumb Shifter
    FREEWHEEL/CASSETTE 11-36T
    CRANK SET Prevelo anodized alloy 3-piece square taper with 130MM crank length.
    SPROCKET 32T with double chain ring guard
    BB SET Sealed cartridge
    HEAD SET 1 1/8" threadless
    RIM Aluminum with grinded sidewalls
    FRONT HUB Lightweight alloy 1-piece forged CNC
    REAR HUB Lightweight alloy 1-piece forged CNC
    TIRE & TUBE Kenda Small Block Eight Pro 24 ×1.5
    SADDLE Prevelo big kid saddle
    HANDLEBAR Prevelo aluminum big bore - 580mm width x 40mm rise with 31.8mm to 22mm taper
    HANDLEBAR STEM Forged aluminum
    GRIP Kraton rubber
    PEDAL Composite with 9/16 chromoly axle
    * Specifications are subject to change without notice

Customer Reviews
4.9 Based on 130 Reviews
5 ★
96% 
125
4 ★
2% 
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Filter Reviews:
    MM
    05/07/2021
    Melissa M.
    United States United States
    • Rider's age in years 8
    • Fit SmallPerfectLarge

    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!

    A
    05/11/2020
    Anonymous
    United States United States

    The Absolute Best!

    Purchased for my 7 year old's birthday. Fit is perfect for her, relatively tall and fairly advanced rider for her age. We've been riding regularly over the last few months and have built up to a couple 10+ mile rides. Components are excellent and she is riding confidently over rolling hills and on occasional gravel. I highly recommend this bike!

    PT
    05/04/2020
    Paul T.
    United States United States

    Top Notch

    Bought this as a birthday present for my 8 year old daughter. She is thrilled with her first geared bike, and couldn't be happier. The bike build and components are very high quality and dealing with customer service was a pleasure.

    HS
    04/30/2020
    Heather S.
    United States United States

    LOVE LOVE LOVE!!!

    At 7.5 yrs old our son decided he was open to learning how to ride a bike. After a lot of research, we wanted to buy a bike that was designed for kids, light weight, and could last for the next few yrs of growth. Couldn't be happier with the purchase, delivery, and design of his bike. Followed the "pedals off first" approach to learning and in one week he's confident and riding along side kids that learned at much younger ages. Thanks so much! Great product. Wish we had done the personalized name inscription.

    Prevelo Bikes Alpha Four Review
    C
    02/12/2020
    Chad
    United States United States

    Such great bikes for kids

    I made the decision to get the alpha 3 a few years ago and never regretted it. One son is now older, the younger one inherited the alpha 3, and I had no questions about getting the alpha 4. The build quality is great, with details such as the kid-centric geometry and internal cable routing. The blue color looks fabulous. I made very few adjustments as I assembled the bike. The alpha 3 required some tweaking, but this one was great. My son was very happy on his 8th birthday. Now both boys can chase their mama while she runs. We have recommended prevelo bikes to many of our friends. Thanks for another great bike.

    Prevelo Bikes Alpha Four ReviewPrevelo Bikes Alpha Four Review