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Stumpjumper Alloy

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Stumpjumper Alloy

The Stumpjumper Alloy brings all-new suspension kinematics and progressive geometry into a full-alloy package that's both lightweight and extremely durable. Outfitted with a no-fuss SRAM SX 12-speed groupset, the Stumpjumper Alloy is your all-access pass for trail adventure.

Technical Specifications

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Frameset

Frame

Alloy chassis and rear-end, asymmetrical design, 29 Trail Geometry, horst pivot BB adjustment, threaded BB, 12x148mm dropouts, sealed cartridge bearing pivots, replaceable derailleur hanger, 130mm of travel

Seat Binder

Alloy, 38.6

Suspension

Fork

RockShox 35 Silver, Solo Air, 44mm offset, rebound adjust, TurnKey lockout, 15x110mm Boost™ Maxle® Lite thru-axle, 140mm of travel

Rear Shock

X-Fusion 02 Pro RL, Rx Trail Tune, rebound adjust, lockout S1:190x42.5mm, S2-S6: 190x45mm

Cockpit

Saddle

Body Geometry Bridge Saddle, steel rails

SeatPost

TranzX dropper, 34.9mm, S1: 100mm, S2: 125mm, S3: 150mm. S4-S5: 170mm, S6- 200mm

Handlebars

Specialized, 6061 alloy, 6-degree upsweep, 8-degree backsweep, 30mm rise, 780mm width

Stem

Alloy Trail Stem, 35mm bar bore

Grips

Specialized Trail Grips

Brakes

Front Brake

Tektro Gemini Comp, hydraulic disc, resin pad, 200mm

Rear Brake

Tektro Gemini Comp, hydraulic disc, resin pad, 180mm

Drivetrain

Chainrings

30T

Crankset

SRAM SX Eagle, S1:165mm, S2-S5: 170mm, S6: 175mm

Rear Derailleur

SRAM SX Eagle, 12-speed

Shift Levers

SRAM SX Eagle, trigger, 12-speed

Cassette

SRAM PG-1210 Eagle, 11-50t

Chain

SRAM SX Eagle, 12-speed

Bottom Bracket

SRAM Powerspline

Wheels & Tires

Rear Tire

Purgatory, GRID Casing, GRIPTON® compound, 29x2.3"

Rims

Roval 29, hookless alloy, 30mm inner width, tubeless ready

Front Tire

Butcher, GRID casing, GRIPTON® compound, 29x2.3"

Front Hub

Specialized alloy front hub disc, sealed cardridge bearings, 6-bolt, 15x110mm thru-axle, 32h

Inner Tubes

Standard, Presta valve

Spokes

Stainless, 14g

Rear Hub

Alloy, sealed cartridge bearings, 12x148mm thru-axle, 32h

* Weights based on production painted frames as pictured. Actual weights will vary based on colorway, frame size, and component variation. Specifications are subject to change without notice.

Geometry

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S1S2S3S4S5S6
Crank Length165mm170mm170mm170mm170mm175mm
Handlebar Width780mm780mm780mm780mm780mm780mm
Stem Length40mm40mm50mm50mm50mm50mm
Saddle Width155mm155mm143mm143mm143mm143mm
Seatpost Length100 mm125 mm150 mm170 mm170 mm200 mm
Stack (Low BB)618mm613mm623mm631mm639mm649mm
Stack (High BB)614mm609mm618mm627mm640mm644mm
Reach (Low BB)410mm430mm450mm475mm500mm530mm
Reach (High BB)416mm435mm455mm480mm505mm535mm
Headtube Length100mm100mm110mm120mm130mm140mm
Headtube Angle (Low BB)65°65°65°65°65°65°
Headtube Angle (High BB)65.5°65.5°65.5°65.5°65.5°65.5°
BB Height (Low BB)327mm332mm332mm332mm332mm332mm
BB Height (High BB)334mm339mm339mm339mm339mm339mm
BB Drop (Low BB)47mm42mm42mm42mm42mm42mm
BB Drop (High BB)40mm35mm35mm35mm35mm35mm
Trail (Low BB)126mm126mm126mm126mm126mm126mm
Trail (High BB)122mm122mm122mm122mm122mm122mm
Fork Length (full)550mm550mm550mm550mm550mm550mm
Fork Rake/Offset44mm44mm44mm44mm44mm44mm
Front Center726mm746mm770mm799mm828mm863mm
Chainstay Length (Low BB)444mm444mm444mm444mm454mm454mm
Chainstay Length (High BB)440mm440mm440mm440mm450mm450mm
Wheelbase (Low BB)1168mm1188mm1212mm1241mm1280mm1315mm
Wheelbase (High BB)1164mm1184mm1208mm1237mm1276mm1311mm
Top-tube Length (horizontal)545mm563mm586mm615mm643mm676mm
Bike Standover Height742mm742mm750mm753mm777mm784mm
Seat Tube Length385mm385mm405mm425mm445mm465mm
Seat Tube Angle (Low BB)77.7°77.7°77.5°77.2°77°76.9°
Seat Tube Angle (High BB)78.2°78.2°77.9°77.7°77.5°77.3°
Max Seatpost Insertion190mm190mm210mm230mm250mm270mm
Min Seatpost Insertion100mm100mm100mm100mm100mm100mm
Geometry

Manual Downloads

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Specialized Bicycle Owner's Manual (All Languages)
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Specialized Bicycle Owner's Manual Addendum: Riding With Kids
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Trainer Usage Addendum to the Bicycle Owner's Manual
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2021 Stumpjumper Alloy User Manual
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2021 STUMPJUMPER ALLOY - USER MANUAL - SWEDISH
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2021 STUMPJUMPER ALLOY - USER MANUAL - SPANISH
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2021 STUMPJUMPER ALLOY - USER MANUAL - SLOVENIAN
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2021 STUMPJUMPER ALLOY - USER MANUAL - SLOVAK
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2021 STUMPJUMPER ALLOY - USER MANUAL - RUSSIAN
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2021 STUMPJUMPER ALLOY - USER MANUAL - PORTUGUESE BRAZILIAN
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2021 STUMPJUMPER ALLOY - USER MANUAL - POLISH
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2021 STUMPJUMPER ALLOY - USER MANUAL - NORWEGIAN
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2021 STUMPJUMPER ALLOY - USER MANUAL - KOREAN
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2021 STUMPJUMPER ALLOY - USER MANUAL - JAPANESE
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2021 STUMPJUMPER ALLOY - USER MANUAL - ITALIAN
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2021 STUMPJUMPER ALLOY - USER MANUAL - GERMAN
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2021 STUMPJUMPER ALLOY - USER MANUAL - FRENCH
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2021 STUMPJUMPER ALLOY - USER MANUAL - FINNISH
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2021 STUMPJUMPER ALLOY - USER MANUAL - ENGLISH
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2021 STUMPJUMPER ALLOY - USER MANUAL - DUTCH
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2021 STUMPJUMPER ALLOY - USER MANUAL - DANISH
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2021 STUMPJUMPER ALLOY - USER MANUAL - CZECH
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2021 STUMPJUMPER ALLOY - USER MANUAL - CROATIAN
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2021 STUMPJUMPER ALLOY - USER MANUAL - CHINESE TRADITIONAL
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2021 STUMPJUMPER ALLOY - USER MANUAL - CHINESE SIMPLIFIED
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2017 FSR Tool Kit User Manual

Rider Reviews

  • 4.5
  • 27 Reviews

Awesome bike Awesome service

Awesome bike Awesome service

Would Recommend?
Yes!

Verified Buyer

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Name:
Guest G.

Helpful?

Stumpjumper Alloy

Great bike to upgrade over time.... stock components perfectly decent, but frame is super compatible for gradual upgrading.

Would Recommend?
Yes!

Name:
Henry

Helpful?

Fantastic, aggressive ride, some weak components

I've been riding this bike for 6 months and it is so much fun. The geometry is perfect (and adjustable), it's solid uphill and a total blast on the downs, especially on aggressive rocky terrain. It works fine out the box but is best thought of as a bike to upgrade over time. The Tektro brakes are a bit spongy and the powerspline crankset is heavy, while the rear shock is a bit limited. If you like to shop for upgrades, great; if you don't, perhaps consider the comp version.

Would Recommend?
Yes!

Name:
Stephen

Helpful?

Great bike, but flawed rear shock

This is my fourth mountain bike, 3rd full suspension one. I was drawn to this particular bike because of, well yes, mainly it's looks, but also the fact it has a threaded BB and sealed bearings in the wheel hubs. I have the S4, probably S5 would've been marginally better as I'm 6 foot, but S4 was the only one available in this barren wasteland of new bikes. The riding position is a bit too upright for my liking so have replaced the stem for an 80mm and fitted flat bars, replacing the 30mm riser bar. Bike feels much better with these changes. The biggest flaw on this bike though is the rear shock.. Lockout is pretty much non existent to a point where the lever position of open to close makes no difference whatsoever to the feel of the bike, this impacts on hill climbing greatly. Once I've replaced this, I think it will be the perfect bike for me.


Name:
Chris

Helpful?

Great bike with aggressive specs

This is my second MTB, first one is a $500 bike which can just do the job. But this one is superior, worth every penny I spent on it. I took it to ride as soon as it out of shop. Perfect


Name:
Rick

Helpful?

Paint very chip prone

I have had it for over 6 months. The matte paint quality is very poor on this one and this is the only reason I am giving it 3 stars. My recommendation is to cover up the entire frame and rear triangle with frame protector. Even If a small rock hits it, it will chip the paint off very easily.


Name:
Zain

Helpful?

I love this bike!

I ride this daily and it works downhill and i race xc on it. It's a beast! One bummer is it's heavy 35 lbs which is okay but you get what you pay for and your paying for good parts not low weight.


Name:
James M.

Helpful?

Great trail bike

I am glad I bought a new stumpjumper alloy. The bike performs great on northeast trails. Built very strong. The 2.3 wide tires float over the soft and rooty ground. Great bike.


Name:
Tc

Helpful?

A great bike

I choose to upgrade to FS and I will never look back. The bike is very smooth when riding technical terrain. I live in Texas so we do not have much elevation, but what I can say is that this bike can handle any Trail you throw at it, at least in Texas. Definitely recommend!


Name:
Chris

Helpful?

So far so good

Im new to MTBing so its hard to compare it to other bikes. I purchased it 3 months ago and have been riding it at least once a week. I can basically fly over any bump, jump or stone. The sx derailer did brake off and broke a few spokes today. Not sure why but apparently its common on the shram sx derailleur. So expect to replace the derailleur, which should be an easy upgrade. I purchased the stumpjumper because of its geometry, which is similar to other highly reviewed bikes.


Name:
Newbie

Helpful?