The aluminum frame is lightweight for easy pedaling & the fast-rolling 700c wheels let you ride further & faster. Go up and down the steepest hills with its 21-speed Shimano drivetrain & linear-pull brakes. Bontrager tires are puncture-resistant & multi-surface & will keep you rolling smoothly and safely. Color subject to change. Trek bikes are sized to the recipient. Please supply the rider's height, inseam & gender information with your order. Information supplied will be used to build and rebox the proper size bike. Some minor reassembly which includes the seat, handle bar, and front wheel required. Each bike will be provided with step-by-step instruction as well as the necessary tools. The reassembly is a simple process that generally takes just minutes to complete.