Stumpjumper ST Alloy 29

Stumpjumper ST Alloy 29

Year

2020

Category
mountain
Price

$2100

Official
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Manufacturer Description

Our Stumpjumper ST models are snappy and nimble, yet Incredibly versatile—the perfect rigs for riders seeking both efficiency and capability. The Stumpjumper ST Alloy 29 makes that winning combo affordable, with components that are big on performance and small on dollar signs. THE ULTIMATE TRAIL BIKE The innovative sidearm frame design makes a lighter, better-handling bike. By directly connecting all three mounting points of the rear-end and shock to the frame, we’ve increased both stiffness and performance over bumps. End result? Total control. PERFECTLY-BALANCED SUSPENSION Our in-house suspension-tuning team develops custom shock tunes, perfectly paired to each bike’s kinematics. We call this Rx Tune and while it’s not the easy way to build a suspension bike, it’s worth it. You feel Rx Tune as perfectly-balanced suspension. SMART PARTS PICK • 29er wheels roll over obstacles and maintain your momentum with ease. • 130-millimeters of suspension courtesy of a RockShox Recon RL fork. • SX Eagle 12-speed drivetrain gives you single-ring simplicity and gearing to spare.

Build Kit

Frameset
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
Cockpit
GripsSpecialized Sip Grip, half-waffle, slip-on
HandlebarsSpecialized 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
StemSpecialized, 3D-forged alloy, 4-bolt, 7-degree rise
Brakes
Levers-
Front BrakesTektro Gemini Comp, hydraulic disc, resin pad, 200mm
Rear BrakesTektro Gemini Comp, hydraulic disc, resin pad, 180mm
Drivetrain
Bottom BracketSRAM Powerspline
CassetteSRAM PG-1210 Eagle, 11-50t
Chain-
Chain RingsSteel, 30T
ChranksetSRAM SX Eagle, Powerspline, 170mm
Front Derailleur-
Rear DerailleurSRAM SX Eagle, 12-speed
Pedals-
ShiftersSRAM SX Eagle, trigger, 12-speed
Wheels
Front HubSpecialized, sealed cartridge bearings, 15x110mm thru-axle, 32h
Rear HubSpecialized, sealed cartridge bearings, 12x148mm thru-axle, 32h
SpokesStainless, 14g
Front TireEliminator, GRID TRAIL casing, GRIPTON® compound, 2Bliss Ready, 29x2.3
Rear TirePurgatory, GRID Casing, GRIPTON® compound, 29x2.3
TubesStandard, Presta valve
Front WheelDouble-wall alloy, 27mm internal width
Rear WheelDouble-wall alloy, 27mm internal width

Geometry

SMLXL
BB Drop----
BB Height----
Chainstay Length----
Crank Length170170170170
Fork Length----
Fork Rake Offset51mm51mm51mm51mm
Front Center----
Handlebar Width780mm780mm780mm780mm
Headtube Angle----
Headtube Length----
Reach405mm425mm445mm470mm
Saddle Width155mm143mm143mm143mm
Seatpost Length406456456456
Seat Tube Angle----
Seat Tube Length----
Stack619mm619mm642mm656mm
Standover Height----
Stem Length50505050
Top Tube Length----
Trail107mm107mm107mm107mm
Wheelbase1151mm1171mm1201mm1232mm