The 2025 Specialized Stumpjumper 15 Comp Alloy Full Suspension Mountain Bike is the second bike in Specializeds flagship mountain bike range. It comes with the latest suspension tech and adjustable geometry. The biggest innovation on the Stumpjumper 15 is GENIE. This patent-pending air spring technology, invented by Specialized, grants every trail riders three wishes: the feel and control of a coil spring, better bottom-out prevention than a standard air spring, and a tuneable platform for a playful feel. Extensive field testing proves that Stumpjumper 15 with GENIE delivers 57% better traction than a standard air-sprung shock because GENIE technology gives you supple, coil-like performance, which keeps the wheel in contact with the ground a greater percent of the time than a typical air spring would.As the quintessential trail bike, Stumpjumper 15 Alloy balances efficiency and optimal bump force management. This bikes geometry delivers big bike capability when you need it, a nimble fe...