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The 2025 Specialized Stumpjumper 15 Comp Alloy Full Suspension Mountain Bike is the second bike in Specialized's 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 rider’s 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 bike’s geometry delivers big bike capability when you need it, a nimble feel in tight sections, and lively, efficient climbing manners. The generous cockpit centers you on the bike, optimizing traction and corner control. The low bottom bracket, slack head tube angle, and optimized fork offset keep things stable in the rough. Six distinct geometry settings allow you to hone performance for any style and any terrain. The head angle and bottom bracket can be fine-tuned for stability or clearance. The bike can be run either with 29 inch wheels front and rear or as a 27.5/29 mullet.

The Stumpjumper 15 Comp Alloy comes with a FOX FLOAT 36 Rhythm 150mm travel fork, super reliable 12 speed Shimano SLX gearing, TRP Trail EVO hydraulic brakes and an X-Fusion Manic dropper post. The S1 and S2 sizes comes with mullet 27.5/29 wheels while the other sizes come with 29 wheels front and rear.

This bike is perfect for

Mountain bikers looking for a trail bike that is efficient to pedal but is still playful and capable of handling big bumps. With 6 different geometry settings and the ability to run either a mullet or 29/29 setup it can be tuned to suit your riding style.

Key Features

• All-new M5 alloy frame with SWAT door integration
• Robust Specialized alloy wheels with sealed cartridge bearings
• Ride Dynamics tuned FOX FLOAT Performance with Specialized GENIE patent-pending air spring technology provides maximum grip and traction found in a linear coil spring, bottom-out prevention found in a progressive air spring, and the ability to tune mid-stroke and end-stroke support independently. 2-position open and firm damper adjustments.
• Eat up the chunkiest trails with the FOX FLOAT 36 Rhythm fork with GRIP damper
• Performance-focused and durable Shimano SLX drivetrain
• Big stopping power from TRP Trail EVO 4-piston brakes
• Trustworthy time and time again X-Fusion Manic dropper post
• Lifetime replacement of suspension pivot bearings to the original owner