Mountain Bikes 26 inch Extra Sturdy Outdoors Exercise Men's Bicycle 18 Speed Durable Mountain Bike Men For Sale! roadmaster Granite Peak Sports Mountain Bike for Women, Black Bicycles Men and Women, Built with durable bicycle parts. Shimano Bike. Cycling Hybrid Frame Tire Steel mountain frame geometry for easy riding Alloy wheels provide control and durability 18 speeds Shimano rear derailleur SRAM drive twist shifters switch gears smoothly Suspension fork help to smoothe bumps and increases control