WHISPER WX300 , Adults , CTB , Wheel size 28" , Number of speeds 21 , Frame Alloy , Fork Steel , Steering wheel Non-adjustable , Brakes Aluminium V-shaped , Front gears 3 , Rear gears 7 , Rear derailleur Dacron TZ 35 , Wheel rim Aluminium , Black / Green , Weight 17.2 kg