GT Grunge 20 Boys Bikes Grey (2021)

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Features

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 Grunge Kids Bike combines style, comfort and reliability to form a high-quality kids bike which is great for the developing rider between the ages of 6 and 9. GT's LegitFit Design gives kids bikes the best fit with better positioning and easy pedalling on the lightweight alloy frame. The tough alloy frame is great for a kids bike as it is much lighter than comparable bikes with steel frames so that your kids can ride with control and learn how to handle their bike properly, without struggling to steer a heavy bike. Add to that the alloy rims, stem and seatpost which together form a durable yet lightweight bike which is tough enough to handle rough kids or a few of the bumps that come with learning to ride. The Grunge rolls on 20x1.95" tyres with the ideal blend of grip and control for safe riding, while the coaster allows them to control their speed and ride safely. The GT Grunge Kids Bike sets the bar high for kids bikes, made from reliable parts that are safe an will allow your kids to have heaps of fun on their brand new bike.

Features

  • Improved Geometry 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 Pedaling bikes with the LegitFit system have their pedal positions moved slightly forward. The result: Makes it easier to pedal. 
  • Better Positioning 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.
More Information
SKU GTG55100M50OS
Season 2021
Size 20inch
Click & Collect Yes
Wheel Size 20"
Frame Material Steel
Fork Material Steel
Cassette Type Single Speed
Chainset Type Single
Brake Type Coaster Brake
Bottom Bracket Steel, Ball Type
Brakes Front: Alloy Single Pivot Caliper, Rear: Coaster Rear
Brake Levers Alloy V-type
Chain KMC S1, 1/2x1/8"
Crankset Forged One-Piece Type, 127mm, 32T
Fork GT Hi-Ten Steel, 1" Threaded Steerer
Frame 20" GT LegitFit Design, Alloy
Grips 120mm Closed End
Handlebar Steel Riser Bar, 176mm Rise, 580mm Width
Headset 1" Threaded, Steel
Hubs Steel, Nutted Axle, Coaster Brake
Pedals Jr. BMX Design, Resin
Rims Alloy, 28h
Saddle GT 1-piece
Seatpost Alloy
Stem 2-Bolt Alloy Top, Steel Quill
Spokes Stainless Steel, 14g
Tyres GT 20 x 1.95"
Kids Bike Sizing 20 Inch

Mongoose Kids Bike Sizing Chart

Rider's Height (cm)
75
80
85
90
95
100
105
110
115
120
125
130
135
140
145
150
155
160
165
170
175
180
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.