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Delivered ready to ride in 4 to 10 days

How Bike Delivery Works
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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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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 Ace 24 Kids Mountain Bike Gloss Aqua (2020)

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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 Ace 24 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 8-11. 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 All Terra fork with 50mm travel offers reliable performance for a range of surfaces and is a great introduction for you riders to learn how to ride with a suspension fork.

This bike is the bridge between youth and adult bikes, rolling on Kenda 24x2.1" tyres, with durable double wall rims which come in handy on some rough tracks. Everything is finished off with quality parts, such as alloy seatpost and stem, as well as Shimano Altus Shifter. While the Promax mechanical disc brakes offer reliable stopping power for the youth rider that might be adjusting to the potential of a 24" bike. The GT Stomper Ace 24 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
  • Promax mechanical disc, 160/160mm rotors
  • Alloy Seatpost and Stem
  • Kenda Small Block Eight 24x2.10" tyres


See More Information tab above.

More Information
Season 2020
Size 24inch - G
Click & Collect Yes
Wheel Size 24"
Frame Material Alloy
Groupset Brand Shimano
Groupset Shimano Altus
Cassette Type 8 Speed
Chainset Type Single
Brake Type Mechanical Disc Brake
Front Travel under 100mm
Bottom Bracket Cartridge, square taper
Brakes Promax mechanical disc, 160/160mm rotors
Brake Levers Promax
Cassette Sunrace, 11-34T, 8-speed
Chain KMC Z51, 8-speed
Crankset Prowheel, Pro-V30, 110mm length, 30T
Derailleur Rear Shimano Altus
Fork All Terra, 50mm Travel, 1-1/8" threadless steerer
Frame 24" GT LegitFit Design, alloy w/ replaceable hanger
Grips GT MTB
Handlebar Alloy Riser bar, 30mm rise, 600mm width
Headset 1 1/8" Ahead
Hubs Alloy, 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 Altus, 8-speed
Tyres Kenda Small Block Eight, 24 x 2.1"
Speeds ## x 8
Kids Bike Sizing 24 Inch

Kids Bike Sizing Chart

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

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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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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.