GT Stomper Prime 20 Boys Bike Slate Blue (2019)

Now $416.00 RRP $429.00 SAVE $13.00
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Available on orders over $40. Collection in 1-7 days. WA orders 1-14 days. More info »

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If you've got the kind of kids who just can't seem to stay clean, maybe it's time to get them pedaling through the dirt right alongside you with the GT Stomper Prime 20. The multispeed Stomper mountain line will get them out on the trails and riding confidently, with a LegitFit kids' sizing based around Schwinn's proven SmartStart idea that has them starting faster and pedaling easier.

The lightweight and durable alloy frame is made to withstand kids and is equipped with some handy spec. With an 6-speed Shimano drivetrain, you'll get the reliability that comes with Shimano parts and enough gears for the younger ones to get used to mountain bikes and the 20 inch Kenda tyres. Kids can be wild sometimes and when they are still growing and learning they'll need to be able to stop at a moments notices.

GT have designed the Stomper Ace with kids in mind and therefore made a bike that is durable, comfortable and easy to ride. This bikes is hours of fun for the growing rider and will get kids into the great outdoors.


  • GT Legit Fit System: Better Positioning, Faster Starting and Easier Pedaling
  • GT Designed Alloy Frame
  • Shimano Revo Twist Shifters


See More Information tab above.

More Information
Model Year2019
Bottom BracketCartridge Sealed
BrakesAlloy Linear Pull
Brake LeversTektro 3-Finger, Linear Pull
ChainKMC Z50, 6-speed
CranksetProwheel w/ Double Guard, 110mm, 30T
Derailleur RearShimano Tourney
Popular FiltersBoy's
ForkGT Hi-Ten Steel, 1-1/8" Threadless Steerer
Frame20" GT LegitFit Design, Alloy w/ Replaceable Hanger
HandlebarSteel Riser bar, 20mm rise, 540mm
Headset1 1/8" Ahead
HubsAlloy front QR, Freewheel rear QR
PedalsGT BMX Flat Pedal, Resin
RimsGT Hi-Ten Steel, 1-1/8" Threadless Steerer
SaddleGT MTB
SeatpostAlloy Micro Adjust
StemAlloy Ahead, 30mm
SpokesStainless Steel, 14g
ShiftersShimano Revo Twist Shifter For Small Hands, SL-RS36, 1x6
TyresKenda Small Block Eight, 20 x 2.10"
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About GT Bicycles

GT'S story is simple: speed, speed and even more speed. From GT’s namesake Gary Turner designing one of the first BMX race bikes in 1972 to the modern carbon fiber creations that redefine fast-as-hell, GT has built a long legacy of racing, winning, yet never taking things too seriously.

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Club 99 Membership

Join Club 99 for just $5 when you make a purchase in store, or use the button below to buy membership online. To reward you for being a club member, your Club 99 membership card will give you these great benefits:

  • Discounted Club 99 pricing, in store and online
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  • Access to exclusive guarantees

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Kids Bike Sizing Chart

Rider's Height (cm)
12" Wheel
16" Wheel
20" Wheel
24" Wheel
26" Wheel

This is an accurate estimate, and every new bike comes with a free professional bike fit when you click & collect in store, plus all bikes have a 30 day Perfect Ride Guarantee.