Specialized Stumpjumper 15 Alloy

Specialized Stumpjumper 15 Alloy Overview

The Specialized Stumpjumper 15 Alloy is a trail mountain bike with an M5 Alloy chassis, 145mm rear travel, X-Fusion 02 Pro RL rear shock, RockShox Psylo Silver fork, Shimano Deore 12-speed drivetrain, and Shimano BR-MT420 hydraulic disc brakes. It combines Trail Geometry with SWAT Door integration, head tube angle adjustment, a threaded bottom bracket, internal cable routing, sealed cartridge bearing pivots, and SRAM UDH compatibility.

The X-Fusion 02 Pro RL rear shock uses Ride Dynamics Trail Tune with rebound adjustment and lockout. The RockShox Psylo Silver fork uses a Motion Control Damper, 15x110mm axle, 44mm offset, and size-specific travel with 140mm on S1 and 150mm on S2-S6. The build also includes Specialized Alloy tubeless-ready rims, sealed cartridge bearing hubs, GRID TRAIL tires, Shimano Deore components, and a TranzX Dropper seatpost.

Key Features of Specialized Stumpjumper 15 Alloy

• M5 Alloy chassis and rear-end give the bike a trail frame with 145mm of rear travel.
• X-Fusion 02 Pro RL rear shock includes Ride Dynamics Trail Tune, rebound adjustment, and lockout.
• RockShox Psylo Silver fork uses a Motion Control Damper with size-specific travel.
• Shimano Deore M6100 drivetrain gives the bike a 12-speed setup with a 10-51t cassette.
• Shimano BR-MT420 4-piston hydraulic disc brakes use a 203mm front rotor and size-specific rear rotor setup.
• Specialized Alloy rims use a 29mm internal width and tubeless-ready construction.
• Butcher and Eliminator GRID TRAIL tires pair GRIPTON T9 front compound with GRIPTON T7 rear compound.
• SWAT internal downtube storage adds integrated frame storage.
• Head tube angle adjustment allows the trail geometry setup to be fine-tuned.
• TranzX Dropper seatpost gives the bike size-specific dropper travel.

Ride Use

This is a trail mountain bike for trail riding. The M5 Alloy frame, 145mm rear travel, RockShox fork, X-Fusion rear shock, Shimano 4-piston brakes, GRID TRAIL tires, and adjustable geometry support controlled riding on trail routes. The wheel setup uses a 29-inch front wheel, with 27.5-inch rear wheel on S1-S2 and 29-inch rear wheel on S3-S6.

Why Choose This Bike

The Stumpjumper 15 Alloy combines an M5 Alloy frame, X-Fusion 02 Pro RL rear shock, RockShox Psylo Silver fork, Shimano Deore 12-speed drivetrain, Shimano BR-MT420 brakes, and SWAT internal downtube storage in one trail-focused build. It also has Specialized Alloy tubeless-ready rims, sealed cartridge bearing hubs, a TranzX Dropper seatpost, and a weight of 16.57 kg / 36 lb 8.5 oz in size S4. It comes in Gloss White Mountains and Satin Cast Blue, with frame and fork coverage under a lifetime warranty for the original owner and other Specialized-branded parts covered for 2 years.