The 2025 Specialized Stumpjumper 15 Pro Bike is a playful bike for getting dirty and having fun on the trails. Take on the bumps with ease thanks to GENIE Shock Technology featuring air spring tech that delivers better traction, bottom-out prevention, and a tuneable ride. SRAM parts through the drivetrain deliver smooth shifting and plenty of speed, and the wheels chew up the trail with 29" wheels (S3-S6 sizes), while the S1 & S2 sizes feature a mixed 29" up front with 27.5" rear wheel for increased maneuverability.