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 16.5 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
Sold out - but more are on the way!


Ships Late April 2018.

Note: Your credit card will be charged immediately.
You may cancel your pre-order anytime prior to shipment.

Wheel Size
16 inches

Approx. Age Range
4 to 6 years


Fast and Free Shipping
Orders in by 12 noon PST M-F ship same day.
(except holidays)

Checked and Tuned
Each bike is checked & tuned prior to shipment.

Easy Assembly
Includes all the tools you need & easy instructions.

  • 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. Ships with a bonus short seat post for additional height adjustment.  Includes the tool required to change seat post.
    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.
    Weight (including pedals) 14.5 lbs / 6.6 kg
    Minimum Saddle Height 17.7 in / 450 mm*
    Maximum Saddle Height 25.0 in / 635 mm
    Bottom Bracket Height 7.2 in / 182 mm
    Gain Ratio 3.8
    *The Alpha Two includes a bonus short seat post that allows the saddle height to be lowered to 17.7 inches.
    Standard 300mm seat post height range: 21 in (535 mm) to 25 in (640 mm) 
    Short 200mm seat post height range: 17.7 in (450 mm) to 21 in (535 mm)


    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
  • Kickstand

        • 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


    Custom Color Grips

    Customize your new Prevelo with grips in the rider's favorite color. Made for Prevelo out of 100% silicone by ESI in Southern California.  We will install the grips on your Alpha Two before shipping.

    custom grip colorsprevelo bike custom grip color


    Rider Name Lettering

    • Custom cut out of 2.5 mil vinyl right here at Prevelo HQ in California and applied to BOTH seatstays before shipment.
    • With a bit of work the decal can be removed when it comes time to hand the bike down.



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

Confidence Inspiring Geometry




Customer Reviews

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  • Reviews (25)

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Perfect bike for my little 3 year old

All I got to say is awesome Jacob was super nice very helpful and is really dedicated in making the right bike for our future kids the average bikes you see out there are so heavy for our little ones and these bikes are so light, my son was riding a 12” specialized no training wheels so when we rode about 5 miles he would get tired spinning those little 12” wheels so me researching I found Prevelo came in talked to Jacob saw the bikes in person loved them bought my little one the 16” not the 14” and he rides it just perfect best of all not more foot brake he’s knows how to stop with the break levers now and can put his foot down while slowing down feeling more comfortable, now we can do these long 8 mile rides and he doesn’t get as tired anymore cause the wheels are much bigger and going faster. We are soo happy with the bike and my little baby Andrew absolutely loves it btw he won’t take off his Prevelo shirt lol thank you again Jacob for your great customer service keep up the great work and yes I’ll swing by and go eat some tacos with you i love tacos as well .

Anonymous verified customer review of Alpha TwoAnonymous verified customer review of Alpha TwoAnonymous verified customer review of Alpha Two
Alex G.
United States

Awesome bike - Alpha two

My son turns 4 in a month and we got him the Alpha two for Christmas. After just 3 rides he has totally got the hang of it and is pedaling away. On his second try he had the balance figured out due to the lightweight design. Could not have asked for a better bike. The personal touch of Prevelo makes it even more special that this is his first pedaling bike

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!

Anonymous verified customer review of 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.

Benjamin T. verified customer review of Alpha TwoBenjamin T. verified customer review of Alpha Two