21 speed Hyper Havoc F-S full Suspension Mountain bike. 17 inch aluminum alloy metal. Nice Index grip shifting smooth quite great all terrain mountain bike. Has 26 aluminum rims 26 x 1.95 knobby tires. Lot of these model sold by the retail store Walmart. I buy sell and repair bike just like Front Street Community Bike works here in Coos-bay. Many listed here wonderful place for repairs and bikes as well volunteer do the work alone with you. I added the saddle seat some bike racks and fender available other parts.