Specialized Stumpjumper 15 Alloy 29/27.5" Mountain Bike 2025

Stumpjumper 15 Alloy is here to obliterate every trade-off in the trail game. Devour bumps like a big bike? Check. Short-travel control, playfulness, and efficiency? Double check. How about a heaping helping of personalization to make it perfect for the only rider who really matters—you?  Check, check, check.

• Frame  -  M5 Alloy chassis and rear-end, Trail Geometry, SWAT™ Door integration, head tube angle adjustment, threaded BB, internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, SRAM UDH compatible, 145mm of travel
• SWAT  -  SWAT internal downtube storage
• Seat Binder  -  Alloy, 38.6mm
• Rear Shock  -  X-Fusion 02 Pro RL, Ride Dynamics Trail Tune, rebound adjust, lockout S1:210x52.5mm, S2-S6:210x55mm
• Fork  -  RockShox, Psylo Silver, Motion Control Damper, 15x110 axle, 44mm offset, S1:140mm of travel, S2-S6:150mm of travel
• Front Brake  -  Shimano, BR-MT420, 4-piston caliper, hydraulic disc, 203mm
• Rear Brake  -  Shimano, BR-MT420, 4-piston caliper, hydraulic disc, S1-S2: 180mm, S3-S6: 203mm
• Shift Levers  -  Shimano Deore, M6100, 12spd
• Rear Derailleur  -  Shimano Deore, M6100, 12pd, Shadow Plus
• Cassette  -  Shimano Deore, M6100, 12spd w/Hyperglide+, 10-51t
• Chain  -  Shimano Deore, M6100, 12-speed
• Crankset  -  Shimano Deore, M6120, 30T ring, 55mm chainline, S1-S3:165mm, S4-S6: 170mm
• Rims  -  Specialized Alloy, Tubeless Ready, 29mm internal width, 28h, Front: 29, Rear: S1-S2: 27.5, S3- S6: 29
• Front Hub  -  Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28h
• Rear Hub  -  Alloy, sealed cartridge bearings, 12x148mm thru-axle, 28h
• Spokes  -  Stainless, 14g
• Front Tire  -  Butcher, GRID TRAIL casing, GRIPTON® T9 compound, 2Bliss Ready, 29x2.3"
• Rear Tire  -  Eliminator, GRID TRAIL casing, GRIPTON® T7 compound, 2Bliss Ready, S1-S2: 27.5x2.3, S3- S6: 29x2.3"
• Inner Tubes  -  Standard, Presta valve
• Stem  -  Alloy Trail Stem, 35mm bar bore
• Handlebars  -  Specialized, 6000 series alloy, 6-degree upsweep, 8-degree backsweep. S1-S2: 780 width, 20mm rise: S3-S4: 800 width, 30mm rise: S5-S6: 800 width, 40mm rise
• Grips  -  Specialized Trail Grips
• Saddle  -  Bridge, Steel rails, S1-S2: 155mm, S3-S6: 143mm
• SeatPost  -  TranzX Dropper, remote SLR LE lever, 34.9, S1: 125mm, S2: 150mm, S3: 170mm, S4-S6: 200mm

• Specifications are subject to change without notice.