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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1 × 12 — 12 speed
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.
Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more. Learn more
|Frame||M5 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|
|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|
|Bottom Bracket||SRAM Powerspline|
|Stem||Specialized, 3D-forged alloy, 4-bolt, 7-degree rise|
|Handlebar||Specialized Trail, 6061 alloy, 8-degree backsweep, 6-degree upsweep, 27mm rise, 31.8mm clamp, XS 720mm, S-XL 750mm,|
|Saddle||Body Geometry Myth 155 S, Body Geometry Henge 143 M/L/XL, steel rails|
|Seatpost||TransX dropper, 34.9mm, S: 125mm, M/L/XL: 150mm Travel|
|Grips||Specialized Sip Grip, half-waffle, slip-on|
|Rear Derailleur||SRAM SX Eagle, 12-speed|
|Crank||SRAM SX Eagle, Powerspline, 170mm, Steel, 30T|
|Shifters||SRAM SX Eagle, trigger, 12-speed|
|Cassette||SRAM PG-1210 Eagle, 11-50t|
|Chain||SRAM SX Eagle, 12-speed|
|Brakes||Tektro Gemini Comp, hydraulic disc, resin pad, 200mm|
|Rims||Double-wall alloy, 27mm internal width|
|Front Hub||Specialized, sealed cartridge bearings, 15x110mm thru-axle, 32h|
|Rear Hub||Specialized, sealed cartridge bearings, 12x148mm thru-axle, 32h|
|Tires||Eliminator, GRID TRAIL casing, GRIPTON® compound, 2Bliss Ready, 29x2.3"|