Buy Mongoose 29 XR-PRO Men’s Mountain Bike from Bicycles Orbit. Mongoose XR-PRO Mountain Bike has aluminum frame. XR-PRO Mountain Bike has full suspension to maximize performance. Mongoose XR-PRO Mountain has SRAM SX4 trigger shifters and SRAM X4 rear derailleur to change gear smoothly. Rims are lightweight and durable. Dimensions of Mongoose XR-PRO Bike are 68″L x 23″W x 41″H.