Alpha Two

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 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


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16-Inch Wheels | V-brakes | Single Speed

  • 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. 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. Front and rear hubs with low profile rounded hex bolts and no harsh edged nuts for little legs to knock against.
    6. Three piece crank with squared taper cartridge bearing bottom bracket and ultra narrow Q factor.
    7. Double chain wheel guard.
    8. Custom made cranks. All Prevelo cranks are sized specifically for each model bike, down to the millimeter.
    9. 95% assembled. Just install the handlebar, seatpost and pedals.
    Weight (including pedals) 14.9 lbs / 6.7 kg (14.5 lbs / 6.6 kg with short seat post)
    Minimum Saddle Height 23.0 in / 585 mm (17.7 in / 450 mm with short seat post)
    Maximum Saddle Height 26.0 in / 660 mm (19.8 in / 502 mm with short seat post)
    Bottom Bracket Height 7.2 in / 182 mm
    Gain Ratio 3.8


    A Wheel Size 16"
    B Wheelbase 28.8 in / 730 mm
    C Effective Top Tube Length 15.4 in / 391 mm
    D Head Angle 69°
    E Seat Tube Angle 69°
    F Chain Stay Length 12.1 in / 307 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
    FRONT BRAKE LEVER Tektro aluminum short reach
    REAR BRAKE LEVER Tektro aluminum short reach
    CRANK SET Prevelo anodized alloy 3-piece square taper with 95MM 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 Lightweight alloy 1-piece forged CNC with low profile rounded hex bolts - 14T cog freewheel
    TIRE & TUBE Kenda Small Block Eight Pro 16 ×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
  • Short Seat Post

    To comply with CPSC standards, the standard seat post on the Alpha Two is 350MM. With the standard seat post the lowest seat height is 23 inches. With the optional 140MM short seat post the seat height can be lowered to 17.5 inches. The short seat post includes a 6MM hex key for installation. With this option is checked, both the standard 350MM seat post and the short 140MM seat post are included.


    • Custom sized for the Prevelo Alpha Two
    • 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

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

Confidence Inspiring Geometry




Customer Reviews

Based on 14 reviews
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  • Reviews (14)

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United States

Unbelievable creation!

From the design to the lightweight features trail bike goes beyond all of our expectations. There were comments regarding the safety of the chain guard however that is not an issue whatsoever. From the first try our 4 year old son was racing around the driveway and soon riding advanced trails with dad. The Alpha two trail bike has created a passion for riding at a young age and is now our favorite event to do together! Everyone who has a glimpse of the bike is impressed. Thank you for the product.

United States

Just what we needed

The Alpha Two made all the difference in our biking. We had been struggling with our 4 year old to get her riding without training wheels. Not only was it challenging for me to help her learn to ride without training wheels but her frustration continued to grow and going outside on her bike was no longer fun. That all changed with the Alpha Two! Right out of the box, which was delightfully easy to ‘assemble’, she got on and began to scoot and by the end of the day she was riding. I could not believe it, she was so proud of herself and found joy in riding bikes once again. She literally taught herself telling me “mom, this is my bike. I have to do this by myself”, so I got the pleasure of just watching her figure out the balancing and coordination of getting her feet on the pedals. Knowing how phenomenal these bikes are for kids I’m not going to wait to get my younger son on a bike. So easy, so fun, so wonderful!

Alpha Two
Benjamin T.
United States

Worth it's Weight in Gold

Short review I recommend this bike to anyone & everyone looking for a bike for a young rider. I would give it 10 stars if I could. I also can't say enough good things about Jacob as a business owner. The "combo pack" with the short post is genius & his customer service is second to none. Long review We were originally hesitant, asking ourselves "should we really spend this much money on our son's first pedal bike?" The answer is absolutely yes! It's possibly the best money we've ever spent on him. Your kid's first pedal bike lays the foundation in their minds for what bike riding is. This bike builds a foundation of confidence which allows your kid to associate bike riding with fun. 3 weeks of riding a "big kid bike (we gave him his Alpha 2 for his 4th birthday) & our son has already gone for 2 rides of 8 miles & one ride of 9 miles. He has so much fun & feels so confident riding that he keeps asking to go further. The geometry is perfect for small riders. The brakes are there when he reaches for them. If his feet slip off the pedals he can find them without looking. The light weight allowed our son to learn to take off & stop on his own very quickly. The center of gravity allows him to recover from the wobbles that come while learning. Jacob was also a pleasure to do business with. A local shipping company "lost" our bike & said that they might not be able to remedy the situation until it would have been too late to get anohter bike here in time for my son's birthday. When I told Jacob that he offered to send me a new bike right away even though the problem wasn't his fault. He said "What kind of kid's bike company would we be if I let a kid go without a bike on his birthday?" You don't get service like that from big companies. The only question we have now is whether his next bike will be an Alpha 3 or a Zulu 3.

Alpha TwoAlpha Two
Jason S.
United States

Self teacher

I got the Prevelo Alpha Two for my son’s 4th birthday. He is small for his age but the shorter seatpost all of the way down allowed him to touch the ground easily. On day 1 I ended up taking the pedals off so that he could use it like his balance bike and get used to the brakes. He loved using the brakes and was able to pull them easily. On day 2 I put the pedals back on. I pushed him around for a little and started letting him go. The next thing I know he was going on his own and able to start and stop by himself with no problems. I bought the Alpha Two because of the low standover for a 16” wheeled bike. I’d recomend this bike to anyone. The quality is great and my son is very comfortable on it.

United States


What an awesome bike, we love it! This is my 4 year old's first bike and he figured it out quickly. Thank you, Prevelo!