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The Specialized Stumpjumper ST 650b Full Suspension Mountain Bike features tube shapes and an asymmetrical design to ensure that you get awesome ride characteristics. For the build, you'll find durable, performance-driven components like Tektro Gemini hydraulic disc brakes, the reliable SRAM SX Eagle shifting, an X-Fusion rear shock, and a RockShox Recon RL fork. So get ready, because the Stumpjumper ST Alloy 650b is sure to exceed your expectations of how a trail bike should ride.

  • The M5 alloy frame, asymmetrical “sidearm” design, and 27.5 Geometry, make this Stumpjumper both nimble and capable.
  • 130-millimeters of plush and controlled suspension (including a lock-out) come courtesy of a RockShox Recon RL fork.
  • SX Eagle 12-speed drivetrain gives you single-ring simplicity and all the gearing you need to summit the biggest climbs.
  • 27.5 wheels accentuate the Stumpjumper ST’s playful on-trail feel.
  • The TranzX seatpost lets you drop your saddle on descents, increasing your maneuverability and control when the trail gets dicey.



Frame M5 alloy chassis and rear end, asymmetrical design, 27.5 Trail Geometry, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel
Fork RockShox Recon RL, Motion Control damper with low-speed compression to lockout, 51mm offset, rebound adjust, 15x110mm Boost Maxle Lite thru-axle, 130mm of travel
Rear Shock X-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout 190x42.5mm
Shifters SRAM SX Eagle, trigger, 12-speed
Rear Derailleur SRAM SX Eagle
Front Brake Tektro Gemini Comp, hydraulic disc, resin pad, 200mm
Rear Brake Tektro Gemini Comp, hydraulic disc, resin pad, 180mm
Cranks SRAM SX Eagle, Powerspline, 170mm - Steel, 30T
Cassette SRAM PG-1210 Eagle, 11-50t
Bottom Bracket SRAM Powerspline
Chain SRAM SX Eagle, 12-speed
Hubs Specialized, sealed cartridge bearings, 15x110mm thru-axle, 32h / Specialized, sealed cartridge bearings, 12x148mm thru-axle, 32h
Spokes Stainless, 14g
Rims Double-wall alloy, 27mm internal width
Tires Eliminator, GRID TRAIL casing, GRIPTON compound, 2Bliss Ready, 27.5x2.3" / Purgatory, GRID Casing, 2Bliss Ready, 27.5x2.3"
Pedals Specialized Dirt
Stem Specialized, 3D-forged alloy, 4-bolt, 7-degree rise
Handlebars Specialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 780mm, 31.8mm clamp
Grips Specialized Sip Grip, half-waffle, slip-on
Saddle Body Geometry Myth 155 S, Body Geometry Henge 143 M/L/XL, steel rails
Seat Post TransX dropper, 34.9mm, S: 125mm, M/L/XL: 150mm Travel
Seat Binder Specialized bolt-type, alloy, 38.6mm
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