GT Grunge 20" Boys

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The GT Coaster Grunge is a 20 inch kids bike for the up and coming rider. This model is starting to get some similar features to adult bikes, with an alloy frame designed using the LegitFit system which provides better positioning, easier pedaling, and a faster start to your next ride. While you’ll also get a range of durable alloy components, such as stem, seat post and rims. When your kids are flying around and having a great time on their bike, they’ll need to be able to stop at any moment. For this reason it is equipped with coaster brakes, for the perfect amount of braking power for the little ones, so that they can be kept safe and sound. This bike offers reliability, durability and good looks in one package, perfect for a younger rider.


  • Alloy Stem, Seat Post, and Rims
  • Coaster rear Brake
  • Steel Riser Bar with Closed End Grips

Bottom Bracket Steel, Ball type
Cassette 16T Coaster
Chain KMC HV410 1/2" x 1/8"
Crankset Forged One-Piece Type, 89mm, Steel, 28T
Popular Filters Boy's
Fork GT Hi-Ten Steel, 1" Threaded Steerer
Frame 16" GT LegitFit Design, Alloy
Grips 95mm closed end
Handlebar Steel Riser bar, 130mm rise, 500mm
Headset Steel, 1"
Hubs Steel, 20 Hole, 3/8" Axle front, Steel, 20 Hole, Coaster rear
Pedals Jr. BMX design, resin
Rims Alloy, 20h
Saddle GT 1-piece
Seatpost Alloy
Stem 2-Bolt Alloy Top, Steel Quill, 30
Spokes Stainless Steel, 14g
Tyres GT 16 x 1.95"