The Diamondback RM12 boys bike has an 8.5" lightweight alloy frame and 12" wheels. With a bright and stylish look the Diamondback RM12 benefits from: Lightweight aluminium MTB frame Lightweight alloy rims Pneumatic tyres for better control Caliper brakes for steady braking with easy pull levers for little hands Mudguard for added protection Safety non-slip pedals Enclosed chain guard for clean & safe cycling Detachable stabilisers 2 piece handlebar & stem so you can fine tune the riding position & reach slightly. Spoke decorations Weight of this bike is Approx. 8 kgs. The 8.5" frame is suitable for an inside leg range of 34cm to 41cm (age 3+) All Diamondback bikes exceed the latest European Safety Standards