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Delivered ready to ride in 4 to 10 days

How Bike Delivery Works
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Place your order

Select the product you are interested in, Select delivery and type in your postcode, Select Bike Delivery, if this is not available there is no available stock nearby

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Order Confirmation

Once your order is placed we will be in contact with you within 2 hours, to confirm your order.

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Bike Build

Your bike will be built up at your local 99 bikes by one of our expert mechanics and safety checked prior to delivery.

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Your bike is delivered to your door by a 99 Bikes expert who will walk you through your new bike and answer any questions you may have.

GT Stomper Prime 20 Kids Mountain Bike Blue/Silver (2020)

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Up to 12 months interest free

or 4 interest-free payments of  $108.75
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Perfect Ride Guarantee

Perfect Ride Guarantee
If you don't love it, you can swap it, up to 30 days from purchase!* Learn more »

Free Bike Build

Free Bike Build
We'll build your bike for free when you click and collect at any 99 Bikes store.

First Free Service

First Free Tune-up
Every bike come with a complimentary free tune-up and safety check.

Please note, due to challenges in the product supply chain, bike specifications are subject to change without notice. Specifications listed below may not match exactly as shown in the photo.

The GT Stomper Prime 20 is the ultimate kids mountain bike for the active kid that isn't quite ready for a full size adult mountain bike. GT made this bike to be durable, versatile and ready for the most active kids aged 6-9. It is built with a GT Legit Fit System alloy frame which is lightweight and tough, yet offers the perfect fit for smaller riders. It enables kids to ride in comfort and ride the bike as intended, even if they're on the smaller side. While the GT Hi-Ten Steel offers reliable performance for a range of surfaces.

This bike is the bridge between youth and adult bikes, rolling on Kenda 20x2.1" tyres, with durable double wall rims which come in handy on some rough tracks. Everything is finished off with quality parts, such as an alloy seatpost and stem, as well as Shimano Revo Twist Shifter for small hands. While the GT V-brakes offer reliable stopping power for the youth rider that might be adjusting to the potential of a 20" bike. The GT Stomper Prime 20 is a high-quality youth mountain bike that doesn't break the bank or compromise on safety or quality. This bike offers reliable fun for years to come.


  • GT Legit Fit System: Better Positioning, Faster Starting and Easier Pedaling
  • Shimano Revo Twist Shifter For Small Hands
  • Alloy Seatpost and Stem
  • Kenda Small Block Eight 20x2.10" tyres

For more information on kids bikes and sizing see our Kids Bikes Buying Guide.

More Information
Season 2020
Size 20inch - G
Click & Collect Yes
Wheel Size 20"
Frame Material Alloy
Fork Material Steel
Groupset Brand Shimano
Groupset Shimano Tourney
Cassette Type 6 Speed
Chainset Type Single
Brake Type V-Brake
Bottom Bracket Cartridge, square taper
Brakes GT V-brake
Brake Levers Alloy
Cassette Sunrace, 14-28, 6-speed freewheel
Chain KMC Z51, 7-speed
Crankset Prowheel, Pro-V30, 110mm length, 30T
Derailleur Rear Shimano Tourney
Fork GT Hi-Ten Steel, 1-1/8" threadless steerer
Frame 20" GT LegitFit Design, alloy w/ replaceable hanger
Grips GT MTB
Handlebar Steel Riser bar, 20mm rise, 540mm width
Headset 1 1/8" Ahead
Hubs Freewheel, QR
Pedals GT Flat Pedal, resin
Rims Double wall, w/ Machined Sidewall, 28h
Saddle GT MTB
Seatpost Alloy Micro Adjust
Stem Alloy Ahead, 30mm
Shifters Shimano Revo Twist Shifter For Small Hands, SL-RS36, 6-speed
Tyres Kenda Small Block Eight, 20 x 2.1"
Speeds ## x ##
Kids Bike Sizing 20 Inch

Kids Bike Sizing Chart

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

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How Same Day Delivery Works?

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Delivered before 8:30pm same day

How Same Day Delivery Works
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All Orders placed before 3pm will be booked for same day shipping. Orders placed after 3pm will be delivered next day.

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Order Confirmation

Once your order is placed we will be in contact with you within 2 hours, to confirm your order.

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Pick up and Tracking

Our trusted courier partner will pick up your order and send you tracking information.

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Your order will be delivered before 8:30 pm on the same day the order was placed.