2020 Specialized Stumpjumper ST Alloy 29

The 2020 Specialized Stumpjumper ST Alloy 29 is a 29″ aluminum frame full suspension trail bike with upper mid-range components.

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2020 Specialized Stumpjumper ST Alloy 29
  • MSRP $2,010
  • Front Travel 130mm
  • Rear Travel 120mm
  • Frame Aluminum
  • Fork RockShox Recon Silver RL
  • Wheels 29″
  • Drivetrain 1 × 12
  • Groupset SX Eagle
  • Brakes Hydraulic Disc
  • Seatpost Dropper post
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1 × 12 — 12 speed

2020 Specialized Stumpjumper ST Alloy 29
24 mph
Similar Bikes
26 mph

The Stumpjumper ST Alloy 29 is easier to ride up hills than similar bikes.

The Stumpjumper ST Alloy 29 won‘t keep up with similar bikes while riding downhill or sprinting.

Estimated Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more. Learn more

Spec level →$0$500$1,000$1,500$2,000
This bike
Other trail bikes



FrameM5 alloy chassis and rear end, asymmetrical design, 29 Trail Geometry, threaded BB, fully enclosed internal cable routing, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 120mm of travel
ForkRockShox 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 ShockX-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout 190x42.5mm
Bottom BracketSRAM Powerspline
StemSpecialized, 3D-forged alloy, 4-bolt, 7-degree rise
HandlebarSpecialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 31.8mm clamp, XS 720mm, S-XL 750mm,
SaddleBody Geometry Myth 155 S, Body Geometry Henge 143 M/L/XL, steel rails
SeatpostTransX dropper, 34.9mm, S: 125mm, M/L/XL: 150mm Travel
GripsSpecialized Sip Grip, half-waffle, slip-on
Rear DerailleurSRAM SX Eagle, 12-speed
CrankSRAM SX Eagle, Powerspline, 170mm, Steel, 30T
ShiftersSRAM SX Eagle, trigger, 12-speed
CassetteSRAM PG-1210 Eagle, 11-50t
ChainSRAM SX Eagle, 12-speed
BrakesTektro Gemini Comp, hydraulic disc, resin pad, 200mm
RimsDouble-wall alloy, 27mm internal width
SpokesStainless, 14g
Front HubSpecialized, sealed cartridge bearings, 15x110mm thru-axle, 32h
Rear HubSpecialized, sealed cartridge bearings, 12x148mm thru-axle, 32h
TiresEliminator, GRID TRAIL casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"
2020 Specialized Stumpjumper ST Alloy 29