GT Grunge 20 Boys Bikes Grey (2021)
Up to 12 months interest free
Perfect Ride Guarantee
If you don't love it, you can swap it, up to 30 days from purchase!* Learn more »
Free Bike Build
We'll build your bike for free when you click and collect at any 99 Bikes store.
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.
- 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.
|Click & Collect||Yes|
|Cassette Type||Single Speed|
|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|
|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
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.
- M2O Pilot 620ml Insulated Bottle Smoke/Black$29.99 $26.00 $23.40
- SIS Go Plus Caffeine Gels 60ml Citrus$4.99 $4.40 $3.60
- JetBlack Big Fella Floorpump$69.99 $59.00 $53.10
- BBB Minifit Brass Bell Random Color White, Blue, Red and Green$14.99 $12.00 $10.80