Aluminum mountain-tuned frame with Schwinn suspension fork for controlled riding on rough terrain 21-speed twist shifters and Schwinn 14-28T freewheel offer quick gear changes Alloy linear-pull brakes deliver sure stops Schwinn alloy cranks with triple chain rings for optimal gearing Alloy rims with 26" x 2.4" wide all-terrain tires for superior traction Schwinn sport saddle with quick release seatpost provides easy height adjustability 26" wheels fit riders 58" to 66" inches tall