GT Siren Coaster 20"

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Created using GT's Legit Fit System, the Grunge specifically caters for growing bodies. The Legit Fit system allows GT to build bikes that cater for proper gearing and body positioning without compromising on performance. Now there's no need to 'grow into a bike'. 


  • GT Legit Fit System: Better Positioning, Faster Starting and Easier Pedaling
  • GT Designed Alloy Frame
  • Rear Coaster Brake
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