Alpha One

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 + 9.5 to 13.5
Alpha One 14" 2½ to 4½ 12.5 to 16 12.5 to 16
Alpha Two 16" 3½ to 6 16 to 18 with short seat post
(21.5 to 24 with long seat post)
15 to 17.5 with short seat post
(20.5 to 23.5 with long seat post)
Alpha Three 20" 5 to 9 18 to 23 17.5 to 22.5
Alpha Four 24" 7 to 11 24 to 29 23 to 28
Zulu Three 20" 5½ to 9 21 to 26 20 to 25
Zulu Four 24" 8 to 11 24 to 29 23 to 29

Easier to learn on. Easier to teach on.
Wheel Size:14 inches
Approx. Age Range: 2½ to 4½ years
USA Customers: In Stock - Ships Free and Fast!
Canadian Customers: Available in Canada Soon. Click to be notified.

14-Inch Wheels | V-brakes & Coaster Brakes | Single Speed

  • The 14" Alpha One is the smallest pedal bike in the Prevelo lineup and fits most 2.5 to 4.5 year olds. It's packed with features to get little riders off to the right start, including:
    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. Tektro front and rear v-brakes with small reach brake levers.
    5. Rear coaster brake (removable with optional freewheel kit).
    6. Front hub with low profile rounded hex bolts and no harsh edged nuts for little legs to knock against.
    7. Three piece crank with squared taper bottom 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.
    Weight (including pedals) 14.4 lbs / 6.5 kg (13.45 lbs / 6.1 kg with freewheel kit installed)
    Minimum Saddle Height 15.6 in / 397 mm
    Maximum Saddle Height 17.5 in / 445 mm
    Bottom Bracket Height 6.7 in / 170 mm


    A Wheel Size 14"
    B Wheelbase 26.3 in / 667 mm
    C Effective Top Tube Length 13.7 in / 349 mm
    D Head Angle 69°
    E Seat Tube Angle 70°
    F Chain Stay Length 10.7 in / 271 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
    FRONT BRAKE Tektro aluminum V-brake
    REAR BRAKE Tektro aluminum V-brake & coaster brake
    FRONT BRAKE LEVER Tektro aluminum short reach
    REAR BRAKE LEVER Tektro aluminum short reach
    CRANK SET Prevelo anodized alloy 3-piece square taper with 85MM crank length.
    SPROCKET 25T 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 with low profile rounded hex bolts
    REAR HUB Steel with integrated coaster brake - 14T cog
    TIRE & TUBE Kenda Small Block Eight Pro 14 ×1.5
    SADDLE Prevelo small kid saddle
    HANDLEBAR Prevelo Aluminum - 470mm wide x 50mm rise - 22.2mm to 19mm taper
    HANDLEBAR STEM Aluminum 30mm extension
    GRIP Kraton rubber
    PEDAL Composite with 9/16 chromoly axle
  • Freewheel Kit

    CPSC standards require this bike to be shipped with a coaster brake installed. The optional kit allows the installation of a freewheel. The Freewheel Kit includes a complete wheel with a freewheel hub, tire and tube. Requires Installation.


    • Custom sized for the Prevelo Alpha One
    • If you order a kickstand with a bike, it will come installed on the bike
    • Lightweight aluminium alloy
    • Non-corrosive, solid non-porous casting
    • Dual spring pressure plate and snap action mechanism with hardened steel pivot pin
    • Non-slip clamping surface
    • Made in USA



What the bicycle media is saying

From the tiny saddle to the custom 85mm-long cranks, everything on the Alpha One has been thought-through with the dedication and passion I normally see reserved for bikes costing thousands more.

- Red Kite Prayer


Alpha Zero Lifestyle



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  • Reviews (2)

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Shah R.

Amazing Bicycle from an Truly Great Company

We had winnowed our bicycle selections for our son's first bicycle down to two bicycles. It was a difficult process because we had two requirements; it must be able to accommodate a short inseam of 15', and it has freewheel option. As we read the comments on a toddler bicycle website, someone mentioned Prevelo. I would like to thank this person. We never even heard of the company, and I decided to take a closer look. I immediately saw the quality of the welds, the thoughtfully designed aluminum frame, and the brakes. Even though the the bikes were not well reviewed, I read about the company itself, how they started new with a vision about how toddler bicycles can be. What sold me is an article written by their engineer, someone who has designed bicycle frames for major companies for 40 years. Finally, when placing the order, we found out that it was local to us. I decided to ring up the number and was surprised to find out the man I was talking to was the owner. Being entrepreneurial myself, I had to visit the company, and we ended up buying the bike directly from the owner! :) My son had the most amazing first-bicycle purchase experience. Thank you for Prevelo for building the most well-designed first-bicycle on the market today. We truly believe that.

Alpha OneAlpha One
Erik O.
United States

Assembly was easy. Bike is

Assembly was easy. Bike is well-built and has excellent geometry for our 3-yr old.