Schwinn GTX 1.0 Men's Dual Sport Bicycle 700c Wheels 18"/Medium Frame Size Schwinn aluminum dual sport frame with Schwinn suspension fork offers versatile riding Micro shift 21 speed twist shifters with Shimano rear derailleur for precise gear shifting Front and rear alloy V brakes stop securely Schwinn alloy crank offers optional gearing 700C Alloy wheels with Schwinn multi use tires for use on or off road 16" Frame size