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

Zulu Four: In Stock
Zulu Four HEIR: Sold Out

Wheel Size
24 inches

Approx. Age Range
8 to 11 years

10 or 11

Trail Optimized

Fast and Free Shipping

Shipping Terms

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

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

1% for the Planet
Prevelo donates 1% of sales to planet worthy causes.

Note: Final component spec is slightly different from the image above. See the "Components" section below for a detailed break down of the components included.
The Prevelo Zulu Four packs high performance mountain bike features into a 24-inch wheel size package. Every component is the real deal and is carefully chosen to provide the best performance and fit for young riders ready to tear up the trails. It features:
  1. Prevelo confidence inspiring low and narrow geometry. Prevelo geometry keeps the rider low, balanced and in control.
  2. Zulu specific slack head tube angle keeps the bike controlled over rough terrain.
  3. Lightweight aluminum frame with custom formed 6061 triple- butted tubing and TRAPT™ downtube profile.
  4. Available with a lightweight 80mm travel airfork with HM Carbon Fiber / AL6061 lowers & AL7050 hard anodized 30mm stanchions and adjustable rebound, lockout and compression and 15mm Thru-Axle
  5. Rear hub with 12mm Thru-Axle
  6. Flat mount rear brake caliper keeps the rear brake caliper tucked away and protected between the rear chain stays.
  7. Tektro front and rear hydraulic disc brakes.
  8. Wide Span Shimano drive trains and available with either SHIMANO DEORE SHADOW RD+ 10-speed or SHIMANO SLX SHADOW RD+ 11-speed 
  9. Available 11-46T wide span gearing gives riders plenty of range to spin up tough hills.
  10. Kid engineered direct mount crank. All Prevelo cranks are sized specifically for each model bike, down to the millimeter.
  11. Stealth cable routing.
  12. 95% assembled. Just install the handlebar, seatpost, frontwheel, and pedals.

Kid Centric Features

prevelo bikes kids mountain bike crank

Kid Engineered Crank

prevelo zulu kids mountain bike disc brake

Tektro Hydraulic Disc Brakes with Flat Mount Rear Caliper

prevelo zulu three kids mountain bike internal cable routing

Internal Cable Routing

Prevelo Confidence Inspiring Geometry
Slack, Long and Low



prevelo kids mountain bike 20 boost rear hub

Rear Hub with 12mm Thru-Axle

prevelo 20 kids mountain bike carbon air fork

Available Carbon Lower Airfork with Adjustable Rebound

zee derailleur

Shimano SHADOW RD+ Drivetrain with Wide Span Gearing

kid jumping mountain bike

0% Digital
100% Real


prevelo zulu four 24 kids mountain bike


Customer Reviews

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Kelly Jorgensen
American Fork, Utah

Confidence Inspiring!

This is the best kids hard tail mountain bike I've been able to find for under $1000 for my 9 year old son. The geometry on this bike is dialed for young riders! Low stand over and low bottom bracket equals more confidence and ability to control the bike. Correct width handlebars get your kid in a good riding position and improves handling. My son has been having a blast since throwing a leg over this bike. It's light enough for him to climb on real single track trails and built for shredding back down. Hydraulic disc brakes give him plenty of stopping power and keep his little hands from getting sore and tired. Real air fork, grippy tires, crisp shifting and plenty of gears to keep up with mom and dad. I'd recommend this bike to anyone looking to get their kids out on the trails! Thanks for making a proper mountain bike that works for the groms!

United States

Perfect. Just what we wanted.

My 4’5” 9yo is pretty decent on a bike. He enjoys jumping and pump track but there have been so few good mountain bike options that we’ve not been able to much of that together. I wanted to make sure that when we did ride, he wouldn’t have to lug around a 30 pound machine but could ride something as nice as I do. The Zulu 4 was perfect. The fit is spot on (we used the online sizing guide), and the home assembly was very easy. It appears well crafted and the youth components were essential in my decision. Very happy I went with Prevelo and the Zulu 4.

United States


Bike is fantastic, cranks are perfect length, lightweight, very stable. He loved it from the moment he started riding it. Went on our first trail and he climbed better than before, even though his last bike was 17lbs.

John D.
United States

ZULU Four Heir

Decided on getting the ZULU Four Heir for our 11yr old boy. His old ride was a Felt 24 inch and was heavy, really heavy. After watching him struggle to keep up and wrestle with the weight I started looking for a lighter ride with quality components. I looked at Spawn, TC, and a few others. My opinion was that Prevelo offered good quality at a good price so I got it. It arrived as promised and was packaged really well. The instructions are very clear and can be followed by anyone successfully. The supplied allen wrench didn't fit the bolts, but no biggie. Plenty of tools around with this being our youngest. The front caliper also didn't have the spacer installed IAW the instructions but, since no one had squeezed the lever they fit smoothly on the disk. Other than that the bike was already set up as far as derailleur adjustment, tires aired, and fork was preset for him to a T. He has been on several rides already. 3 serious rides and many around the block rides. Bike has met all my expectations and he is on a serious curve now that he has a bike that can perform. His confidence has exploded! I am very happy with Prevelo and will recommend this to anyone looking for a serious ride at a great price point. I really hope they offer a ZULU Six soon when he is ready for a 26.

John D. verified customer review of Zulu FourJohn D. verified customer review of Zulu FourJohn D. verified customer review of Zulu Four
Douglas S.
United States

A terrific bike

This review comes after my eight year old has had seven months on his Zulu Four. He loves it, and his riding has taken off. The bike has endured the abuse an eight year old can dish out. Rims are true, no issues with the components, it was a good purchase. Jacob was great to work with on the bike, we did the first 11x42 build (it looks like the new version is built this way) and that gearing allows my kiddo to climb things he walked up before. We’re living in an era of great kiddo bike options, and Prevelo hits the sweet spot of solid engineering, a good component spec and value in price. It should be at the top of your list for your young shredder.