Schwinn Sumac GSD Women's Mountain Bike (26-Inch Wheels) Stable 26-inch wheels for all-terrain riding 24-speed SRAM equipped rear derailleur with a SX-4 trigger shifter for optimum control Strong and durable N'litened silver label alloy frame with epicenter seat stay Double-wall alloy rims with a double-sealed alloy cassette rear bulb Promax linear pull brakes and brake levers for super-strong stopping power