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Stumpjumper Comp Alloy

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2021 Stumpjumper Comp Alloy

Metal fans rejoice! The Stumpjumper Comp Alloy rocks on, with one of the most advanced alloy frames ever developed. From the frame’s asymmetrical design, taking in the refined suspension kinematics and all-new geometry, to a build kit that strikes the optimal combination of performance and value, it’s metal, but it ain’t heavy metal. And it’s ready to slay some dirt.

Technical Specifications

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Frameset

Seat Binder

Alloy, 38.6

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

Suspension

Fork

FOX FLOAT 34 Rhythm, GRIP damper, two position Sweep adjustment, 15x110mm axle, 44mm offset, 140mm of travel

Rear Shock

FOX FLOAT DPS Performance, Rx Trail Tune, rebound and 3-position compression adjust, S1:190x42.5mm, S2-S6: 190x45mm

Cockpit

Handlebars

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

Stem

Alloy Trail Stem, 35mm bar bore

Saddle

Bridge Comp, Hollow Cr-mo rails, 155/143mm

SeatPost

X-Fusion Manic, infinite adjustable, remote SRL LE lever, 34.9 (S1:100mm, S2: 125mm, S3: 150mm, S4/S5: 170mm, S6: 190mm)

Grips

Specialized Trail Grips

Brakes

Rear Brake

SRAM G2 R, 4-piston caliper, hydraulic disc, 180mm

Front Brake

SRAM G2 R, 4-piston caliper, hydraulic disc, 200mm

Drivetrain

Chainrings

Steel, 30T

Bottom Bracket

SRAM DUB, BSA 73mm, Threaded

Rear Derailleur

SRAM NX Eagle, 12-speed

Shift Levers

SRAM NX Eagle, trigger, 12-speed

Crankset

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

Chain

SRAM NX Eagle, 12-speed

Cassette

SRAM NX Eagle, 12-speed, 11-50t

Wheels & Tires

Rims

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

Rear Hub

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

Spokes

DT Swiss Industry

Rear Tire

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

Front Tire

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

Front Hub

Alloy, sealed cartridge bearings, 15x110mm thru-axle, 28h

Inner Tubes

Standard, Presta valve

* 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 mm170mm170 mm190 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

  • 4.6
  • 12 Reviews

Great bike, but needs some upgrades

I have really enjoyed my 2021 Stumpjumper Comp Alloy, it was a huge upgrade over my Norco Fluid HT2. It handles all the blue/black trail riding I do and makes me want to ride as much as possible. However, I have already had a few issues with the bike after 2 seasons. 1) The rear shock had to be rebuilt after the first season. 2) the rear hub had to be replaced after the 2nd season. It is a good value bike, but be prepared to upgrade the rear hub if you ride a lot.

Would Recommend?
No

Name:
Joel W.

Helpful?

Heck ya, so fun!

This bike is awesome! I fitted it with some cool upgrades and rode the heck out of it last season. I have ZERO complaints with my new Stumpjumper! It rides smooth and handles excellent, so fun!

Would Recommend?
No

Name:
Terry

Helpful?

No confidence in this one

I own multiple bikes and this one is by far the most unstable. The butcher front tire lets go without warning unlike the dhfs and agassi I have on my other bikes. I have tried multiple pressures with no luck. The SRAM brakes take a longer pull to grab than shimano brakes. The suspension is great but too many front tire wash outs and too hard to stop.

Would Recommend?
No

Name:
Jeff

Helpful?

Nailed it

This bike has been great for me. At 5'11 S4 is perfect. Feels planted and confident at speed and lively and flick-able everywhere else. Comfortable and easy to climb with. Get the bottle cage and Specialed tool as well.

Would Recommend?
No

Name:
Wayde

Helpful?

OMG! All you have to do is think it.

I have about 1,500+ miles on mine. It has saved my bacon so many times. In situations I knew were not ideal I would just think it and the bike would say give me more. 27.5 for ever!

Would Recommend?
No

Name:
Craig

Helpful?

Love my Bike

Got my hands on a new S1 and it is awesome. I love taking it DH at Keystone Bike Park while also using it to do some nice uphill and as a beginner it's a better bike than I'll ever be a rider that's for sure!


Name:
Lex

Helpful?

Best bang for the buck love it!

After waiting for an SC Tallboy alloy R build that kept getting delayed again and again, I canceled my special order and after calling a few shops in my area I got lucky and found this bike in an S4 Cast Umber color. Its a great bike with the latest geometry and great components off the bat for the price. Suspension and brakes are a major upgrade from the entry level model. G2 brakes offer a lot of confidence when descending, I love them. Weighed my bike on a bathroom scale (terrible way to weigh a bike) just to get a rough estimate and it came in at 34.4lbs with one up components composite pedals and no bottle cage(i suspect the weight is lower 32-33lbs). I have been doing mostly climbing since I'm up in the mountains for the summer and while it climbs well it feels heavier compared to my 2018 Scott scale 960 hardtail but that's to be expected this bike is way more heavy duty and capable than my last hardtail(use that climb switch). Descending is incredible offers so much capability its scary. This bike is leaps and bounds more capable than I will ever be. I reached 30mphh on a downhill scared to death and the bike wanted more(I attribute that to the FOX suspension and modern geometry). So this bike is a win IMO if you have the cash spring for the carbon comp model from testing it, it feels way lighter and will be better for those tough climbs given the lighter weight. But all in all very happy with my purchase. Would recommend to anyone its a fantastic do it all bike.


Name:
Henry R.

Helpful?

Amazing bike

This bike is amazing and beautiful. I use it for regular MTB and downhill and it handles great. I've gotten so many compliments for my bike out on the trail that I lost count.


Name:
Ramiro

Helpful?

Definitely would buy this product again beautiful bike

This is the third time I take the bike out and I have to say it's the baddest bike I've ever had in my life it's fast the gears are very smooth and it handles The handling is incredible specialize keep making bikes like this.


Name:
Jj K.

Helpful?

In love with my new bike

2nd time riding my new bike and I absolutely love it feels great im 5'9 and purchased an S4 it fits me perfectly. A great bike for the trails. Came from riding a hardtail so Its a great introduction to full suspension.


Name:
Yani

Helpful?