Their Future Begins Here Inspired by the incredibly quick adult Superfly, Trek's kids version of the popular mountain bike is ideal for all adventure loving little ones wanting to explore. A nimble, light frame guarantees some real speed while the hand brakes ensure they remain safe on the trail at all times. There really is no better place to start than the Kids' Superfly – if you're alright with them racing past you in no time! Key features Race-tuned frame, inspired by our super-fast adult Superfly Frame, components, and riding position are single-track ready Fits right from the start, and will grow with the rider Smooth disc brakes for capable, confident stopping Features Suspension fork Front suspension absorbs the bumps of the road, path and trail, and looks cool while doing it. Dialed bar and stem Each size bike has the appropriate bar length and width, combined with adjustable reach for just the right fit. Dialed brake lever Adjustable-reach brake levers fit small hands for safe and confident stopping power. Dialed crank length Crank length is matched to bike size, for best fit and performance. Dialed frame fit All Trek Kids' frames are Dialed with the proper length, standover height, and body position to give young riders confidence, stability, and control. Dialed gearing Every model is Dialed to the rider’s age and strength, so the bike is just right for fun, not too hard or too easy to pedal. Dialed pedal size Every model is equipped with kid-size pedals to fit smaller feet. Dialed saddle Each size bike has the appropriate size saddle, and you can adjust saddle height as your child grows. Dialed grip diameter Every model is equipped with smaller-diameter grips to fit younger hands. Hand brakes Confident stopping for youngsters who are ready to control their speed with their hands. Disc brakes Reliable stopping power in all conditions. E2 tapered head tube E2 is the evolution of the 1-1/8 headset to a tapered head tube, fork and headset system. E2 tapers from a 1.5 lower to a 1-1/8 upper to provide more material where it matters most, for a stronger, lighter frame with point-and-shoot control.