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Prevelo Alpha Three Kids Bike Review (One Of The Best 20 Inch Bikes Around)

Author: Kristen Bonkoski


My son charges up the hill, pedaling out of the saddle, and maneuvers over a rooty section of trail. He cleans it, compliments himself, and powers on.  My husband and I share a quick glance of disbelief — and pride.

I never would have imagined that a just-turned-5 year-old could climb like this, or that they’d be able to manage a 20″ bicycle with gears. But here we are.

When Jacob at Prevelo Bikes suggested that he thought my son was ready for the Prevelo Alpha Three, I was skeptical. It weighs quite a bit more than the Prevelo Alpha Two (the 16″ bike that my son was currently riding), and it has an eight-speed rear cassette.

I wasn’t convinced our little guy was ready for a bigger bike or gears, but I was game for giving it a shot. As it turns out, he figured out the shifting with 10 minutes of practicing, and any issues due to added weight have been negligible compared to the gains in his climbing ability with the addition of gears.

For parents interested in introducing gears at an early age, and for kids who have already mastered pedaling and bike handling, the Prevelo Alpha Three is the ideal 20 inch bike. It doesn’t have the front suspension or the disc brakes of the Prevelo Zulu Three, but it provides big wheels and gears for young kids who can’t yet fit on other 20″ bikes.

prevelo alpha three in bellingham

Review in a Nutshell


  • Low minimum seat height and standover height
  • 8 speed Shimano drivetrain
  • Beautiful aluminum frame
  • Kenda Small Block Eight tires


  • Trigger shifters are challenging for little hands

Price & Where to Buy:

Prevelo Alpha Three Video Review

Frame and Components

Prevelo Alpha Three Frame

The frame, the wheels, and the rest of the component build are top-notch.  Had we speced out a 20″ bike ourselves, we would have built it up just like this.

The naked aluminum frame looks good and is well-built.  It has clean, solid welds, and doesn’t need paint to attract attention.  The frame allows internally routed cables to keep things clean and tidy looking.

Other high-quality components include Kenda Small Block Eight Tires, Tektro brakes, and a Microshift drivetrain.  The Small Block Eight tires are miniature versions of the popular adult mountain bike tire (one of my faves) and provide a smooth fast-rolling ride experience. 

The Tektro handbrakes boast easy-to-reach, easy-to-pull brake levers, and good stopping power even on steep hills and off-road.  Finally, the Microshift drivetrain provides clean shifting even for less-than-perfect-shifting kids.  (I’ll discuss the drivetrain more later on).

Kenda Tires on the Alpha ThreeOther nice-to-haves include a quick release seat collar and wheel skewers.  The quick-release seat collar allows for on-the-trail seat drops and easy adjustment of seat height as kids grow.  I also love finally having my son on a bike with quick release wheel skewers; this is a new experience as all his bikes up until this point have had bolt-on wheels.  The quick-release skewers allow for quick tire changes and easy installation.

Finally, it’s worth noting the custom-made crank arms.  They are sized perfectly for young riders and efficiently transfer power to the rear wheel.


Prevelo Alpha Three Kids Bike

The Prevelo Alpha Three has a minimum seatpost height of 20.7″ and a low minimum standover height. My son has a 19″ inseam and fits on the bike comfortably, although if your child isn’t already a comfortable pedaler I would wait until their inseam is closer to 21″.  Jacob also swapped the standard stem for a shorter one which I would recommend if your child is still on the smaller side.

For a 5 year old, the bike is going to be less nimble than a smaller frame. On his Prevelo Alpha Two for instance, my son is easily catching big air on the pump track and off of jumps, but struggles to get the Alpha Three up much at all.

There have been a couple of times that he’s had crashes and I know that it is simply because the bike is still a bit much for him to handle at times. That said, I’m still not sorry that we’ve introduced him to it, because the gear and bigger wheel size really do make a difference especially on the trail.

For a 6 year old, or kids already in a 6T pant, the frame is ideally sized with some room yet to grow.


The geometry of the Prevelo Alpha Three hits a sweet spot.  It is aggressive enough to be ridden on serious trails, but upright enough to inspire confidence and maneuverability.  The long wheelbase provides stability, and the down-sloped top-tube allows young riders to easily mount and dismount. 

We appreciate that the bottom-bracket is low enough to provide a low center of gravity, but high enough that it can easily clear obstacles.  Lastly, the low-rise handlebars are wide and provide excellent control for young riders.

The only riders we wouldn’t necessarily recommend the Alpha Three for are kids just learning to pedal or particularly timid children.  They might be better off with a bike with slightly less-aggressive, more upright geometry.  (The Islabikes Beiinn and Woom 4 are two examples).

Gearing & Microshift Drivetrain

When we tested the Prevelo Alpha Three, it was spec’d with a Shimano 8-speed drivetrain. Today, the bike comes with a 9-speed Microshift drivetrain.

In our experience, the Microshift drivetrain is a game changer for bike companies. It’s affordable, comes with a short-cage derraileur, and is easy for kids to learn to shift with. It’s far better than the grip shifters that come stock on most kids bikes.

The cassette has a 11-36T range which gives kids plenty of gearing to work with. Compared to a singlespeed that your child is probably coming from, they will see a noticeable improvement in their ability to climb. On the other end of the spectrum, the top-end gears allow them to go fast on flat and downhill sections, which means that they’ll never be spun out again.

With the Shimano drivetrain we tested, the derailleur cage was laughably short and the rear derailleur wheel was comically large.  It was awfully close to the ground and we always worried when riding technical singletrack. The shorter cage is the big advantage of the Microshift drivetrain.

While I was concerned that, at 5, my little guy wouldn’t have the coordination and skill to understand when to shift up and shift down, my worry seems to have been for naught. He took to it immediately. This may not be the case for every 5 year old. I would certainly wait until a child has mastered other skills–pedaling, braking, cornering, etc–before adding a new dimension.


Prevelo Alpha Three

At 19 lbs, the Prevelo Alpha Three is awfully lightweight compared to most 20″ kids bikes and on par with all higher-end bikes.  That said, it is only a few pounds lighter than my  full-suspension mountain bike with 27.5″ plus-sized wheels.  My bike weighs about 20% of my body weight.  In comparison, the Prevelo Alpha Three weighs more than 50% of my little pint-sized five year old’s body weight.  Despite this weight disparity, the low gearing on the Alpha Three allows it to be maneuvered easily uphill and helps make up for some of  the heft.

UPDATE for 2023

Alpha Three and Four frames now have even lower standover, lighter weight, tidy’d up cable routing, the ability to clear up to 2.1″ tires, and a Microshift Acolyte drivetrain. Colorways offered are now silver, blue, red, and pink. Prevelo decided to drop their purple model.

Comparison to the Prevelo Alpha Two and the Prevelo Zulu Three

Prevelo Comparison

Deciding whether the Alpha Two, Alpha Three, or Zulu Three is the best choice for your child is based on three basic factors: 1) inseam length, 2) ability level, and 3) preferred type of riding.

The most obvious (and important!) thing is your child’s inseam length. A bike that is too big (or small) for your child will result in a sub-optimal, and perhaps even dangerous riding experience.

As mentioned earlier, wait until your child has a 19″ to 21″ inseam length before attempting to move up to the Alpha Three. The Zulu Three has a slightly larger minimum seat height and your child needs to have an inseam length of at least 21″ to fit comfortably on it.

As for ability level, don’t push your child into a bigger bike or gears until they are truly ready. They should be riding confidently, quickly, and joyfully on a 16″ bike before attempting a 20″ bike. The bigger frame will also give them trouble if they haven’t yet developed good bike handling skills.

Finally, your child’s preferred type of riding should be taken into account. Assuming your child is large enough, the Zulu Three is going to be the preferable bike if your family does a lot of mountain biking.

The suspension fork and disc brakes will make a huge difference in their enjoyment and ability. If, on the other hand, you are buying a bike for riding around town and to school, stick with the Alpha Three. The extra weight and cost of the Zulu Three is unnecessary for street riding.


For smaller riders that are ready for gears, the Prevelo Alpha Three is the ideal 20″ bike. The lightweight aluminum frame, high quality components, and 9-speed rear cassette will take your child to the next level in their riding ability.

Disclaimer:  Prevelo provided us with a bike to test for this review.  We were not paid nor did we receive any other kind of compensation, and all opinions are our own.  Some of the links in this review are affiliate links, meaning if you click thru and make a purchase, we receive a small commission.

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About Us

The Rascals are a family of three. Kristen (mom), Blair (dad), and Parker (kiddo). We started Rascal Rides when Parker was born and we didn’t want to give up our passion for biking. As we learned, we shared. Over the years, we’ve tested hundreds of kids bikes, helmets, bike trailers, and more.

Kristen is a USA Cycling certified coach and loves to share her passion for biking with other families. Blair is a bike geek, mechanic, and mountain bike junkie. Parker is our resident tester and inspiration.

If you see us out on the trail, make sure to say hi!

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