Getting your kids the right size bike is important and, fortunately, also easy. You just need two pieces of information about your little rider:
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).
Measure the distance from the floor to the top of the book.
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.
Approx. Rider Age (years)
Learner Inseam (inches)
Pedaler Inseam (inches)
9.5 to 13.5
2½ to 4½
12.5 to 16
12.5 to 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)
5 to 9
18 to 23
17.5 to 22.5
7 to 11
24 to 29
23 to 28
5½ to 9
21 to 26
20 to 25
8 to 11
24 to 29
23 to 29
Easier to learn on. Easier to teach on. Wheel Size:16 inches
Approx. Age Range: 3½ to 6 years
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Prevelo Aluminum - 470mm wide x 50mm rise - 22.2mm to 19mm taper
Aluminum 30mm extension
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 people are saying
Worth its weight in gold! I recommend this bike to anyone & everyone looking for a bike for a young rider. I would give it 10 stars if I could.
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.
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.
This is a great bike. Well designed and made- my 4 year old son was able to transition to this bike from his 12'' easily. He calls it his "speed bike" because it is so much easier for him to pedal and ride fast. We went on a 4 mile bike ride with him around San Diego Bay and he led the whole time! I'm really glad we chose this bike.