Product Info
Details + Specs
Stumpjumper 15 Alloy Satin Cast Blue / Dove Grey S3
One trail bike, fewer compromises
Stumpjumper 15 Alloy is here to obliterate every trade-off in the trail game — big-bike capability when you need it, a nimble feel through tight singletrack, and lively, efficient climbing manners, all in one package.
Best for: Trail and all-mountain riding across technical climbs and descents.
At a glance
Frame
M5 Alloy chassis and rear end, Trail Geometry, SWAT™ door integration…
Fork
RockShox Psylo Silver, Motion Control damper, 15x110mm axle, 44mm…
Shock
X-Fusion O2 Pro RL, Ride Dynamics Trail Tune, rebound adjust, lockout…
Drivetrain
Shimano Deore M6100, 12-speed, Shadow Plus
Brakes
Shimano BR-MT420, 4-piston, hydraulic disc, 203mm rotor
Weight
16.57kg / 36lb 8.5oz
Key highlights
fine-tune head angle and bottom bracket height, with SWAT internal downtube storage built into the down tube.
150mm of travel (size S3) with a Motion Control damper for a supple, supportive front end.
Ride Dynamics Trail Tune with adjustable rebound and lockout, delivering 145mm of rear-wheel travel.
a wide-range 10-51t cassette and Shadow Plus clutch derailleur for confident climbing and descending.
Complete specification
Full build details
Components are grouped by bike system so the complete build is easy to scan.
Frameset
Frame
M5 Alloy chassis and rear end, Trail Geometry, SWAT™ door integration, head tube angle adjustment, threaded bottom bracket, internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, SRAM UDH compatible, 145mm travel
Seat Binder
Alloy, 38.6mm
Suspension
Rear Shock
X-Fusion O2 Pro RL, Ride Dynamics Trail Tune, rebound adjust, lockout, 210x55mm (size S3)
Fork
RockShox Psylo Silver, Motion Control damper, 15x110mm axle, 44mm offset, 150mm travel (size S3)
Brakes
Front Brake
Shimano BR-MT420, 4-piston, hydraulic disc, 203mm rotor
Rear Brake
Shimano BR-MT420, 4-piston, hydraulic disc, 203mm rotor (size S3)
Drivetrain
Shift Levers
Shimano Deore M6100, 12-speed
Rear Derailleur
Shimano Deore M6100, 12-speed, Shadow Plus
Cassette
Shimano Deore M6100, 12-speed, Hyperglide+, 10-51t
Chain
Shimano Deore M6100, 12-speed
Crankset
Shimano Deore M6120, 30T chainring, 55mm chainline, 165mm arms (size S3)
Wheels and tyres
Front Wheel
Specialized Alloy, tubeless-ready, 29mm internal width, 28h, alloy sealed-bearing hub, 15x110mm thru-axle; Butcher GRID TRAIL T9 tyre, 29x2.3", 2Bliss Ready
Rear Wheel
Specialized Alloy, tubeless-ready, 29mm internal width, 28h, alloy sealed-bearing hub, 12x148mm thru-axle, 29" rim (size S3); Eliminator GRID TRAIL T7 tyre, 29x2.3", 2Bliss Ready
Cockpit and contact points
Handlebars
Specialized 6000-series alloy, 6-degree upsweep, 8-degree backsweep, 800mm width, 30mm rise (size S3)
Stem
Alloy Trail stem, 35mm bar bore
Grips
Specialized Trail Grips
Seatpost
TranzX dropper, remote SLR LE lever, 34.9mm, 170mm drop (size S3)
Saddle
Bridge, steel rails, 143mm width (size S3)
Weight and sizing
Weight
16.57kg / 36lb 8.5oz
Weight is based on a production painted bike in the stated reference size. Actual weight can vary with colour, size and component variation. Specifications are subject to change without notice.