GT Stomper Ace 20 Kids Mountain Bike – Scotby Cycles

Stomper Ace 20



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Regular price £350.00 Sale price£299.00 Save 15%
Tax included. Shipping calculated at checkout.

Frame Size
  • Good stock levels
  • Out of stock - no further inventory due
Shipping and Returns

Free Shipping

We offer FREE shipping on all conventional bike orders over £499 to addresses within Mainland UK, for bikes under this price we charge a flat fee of £29.99 for shipping.

Typically bikes require one buisness day lead time to ship from our store here in Carlisle, DPD are usually able to collect 2 or 3 bikes a day from us, this means during busy periods there might be a extra day delay – or you can opt to collect your order from us usually within two hours of placing during opening hours for FREE.

Tip: If the bike you're considering is a little short of the £499 threshold you an add some accessories or clothing to your basket to make up the difference and get something for your money rather than paying for shipping.

Shipping Policy

Easy Returns

Simply log in to your account to open a return request within 30 days of receiving your order to return any unwanted items.

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Alternative Sizes


Stomper Ace 20 Kid's Bike








10.35 kg


Learning to ride a bike is memorable, but it isn’t always easy. Kids have to focus on balance, pedalling, and speed... all while trying not to tumble. Up until now, kids’ bikes have basically been grown-up bikes miniaturized for smaller bodies. Designing bikes this way means proper body positioning and pedalling mechanics are compromised. Not Anymore.

LegitFit System

GT has developed the Stomper range to utilize its LegitFit system which is designed specifically for those growing shredders. The LegitFit system enables GT to build kids’ bikes that have narrower cranks, proper gearing and improved body positioning. All with the benefits of optimizing pedalling, balance, and speed right from the start. Even better is that it’s a system that works for kids of all ages... no more needing to “grow into” a bike.


Improved Geometry
GT bikes with the LegitFit system feature geometry adjustments to improve ergonomics for youth statures.

The Result: Increased stability, comfort and confidence for a wider range of riders.

Easier Pedalling
GT bikes with the LegitFit system have their pedal positions moved slightly forward.

The Result: Makes it easier to pedal.

Better Positioning
GT bikes with the LegitFit system have narrower crank and pedal positions that match the width of a child’s hips.

The Result: A stronger, more natural pedal stroke.

Easier Starting
GT bikes with the LegitFit system have fast-start gearing that also reduces top-speed.

The Result: Kids can start quicker while maintaining control and speed.


  • Year
  • Weight
    10.35 kg
  • Speed
  • Brake Type
  • Frame
    GT LegitFit Design, Alloy
  • Fork
    GT Hi-Ten Steel
  • Rims
    All Terra Double Wall
  • Hubs
    Alloy QR
  • Tyres
    Kenda Small Block Eight, 20 x 2.10”
  • Pedals
    GT BMX Flat Pedal
  • Shifters
    Shimano Revo Twist Shifter, SL-RS36
  • Front Mech
  • Rear Mech
    Shimano Tourney
  • Cassette
    Shimano TZ500, 14-28
  • Chainset
    Prowheel w/ Double Guard, 30T
  • Brakes
    GT V-Brake
  • Stem
    Alloy Ahead
  • Bars
    Alloy Riser Bar
  • Saddle
    GT MTB
  • Seatpost
    Alloy Micro Adjust

Model specifications correct at time of entry based on provided data, whilst we do our best to maintain an accurate specification it is possible that GT might have changed these specifications without notifying us as component shortages occur.



From their Southern California beginnings in 1972 to today, GT continues to remain true to their BMX and mountain bike heritage mixing performance with serious fun to deliver good times everywhere their bikes are ridden.

Free Shipping

Bikes over £499 are shipped free of charge* with next day express shipping from £9.99

See Shipping Policy for details.

Easy Returns

You can return any unwanted items to us within 14 days* for a refund via our returns centre.

See our Refund Policy for details.

Peace of Mind

All of our products are backed by a 12-month manufacturers warranty.

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