Clear Icon
Search Icon
Clear Icon
Search Icon

Stumpjumper Alloy

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

Add Icon

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

Rear Shock

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

Fork

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

Cockpit

Saddle

Body Geometry Bridge Saddle, steel rails

SeatPost

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

Stem

Alloy Trail Stem, 35mm bar bore

Handlebars

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

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

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

Crankset

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

Chainrings

30T

Bottom Bracket

SRAM Powerspline

Wheels & Tires

Rims

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

Front Hub

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

Rear Hub

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

Front Tire

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

Rear Tire

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

Spokes

Stainless, 14g

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

Add Icon
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

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

Icon

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?

best trail mountain bike ever for the price

I have been riding this bike for months now and it crushes all trails and jumps. it even handles downhill pretty well. one suggestion I would make is if you have the extra money, buy the comp edition for those rock shock forks and rear suspension. I ride almost every day and I love the geometry of this bike. low long and it handles so well in everything. I just wish it was easier to adjust the compression on the forks.


Name:
Teder S.

Helpful?

Phenomenal Trial Bike

5'10"" ride an S3 absolutely love it, nimble on the trail and wheels are big enough to eat up rocks and roots, suspension feels great too.


Name:
Joe

Helpful?

I would spend the extra $1000 for the comp

Eagle SX derailleur is junk. Mine snapped at the frame on my 7th ride. Like the bike but why cheap out with inferior derailleur parts on a mountain bike


Name:
Mike

Helpful?

Great Bike Minus the Shock

I am a first time full-suspension MTB rider and I love my 2021 Stumpy alloy. I have been riding it weekly and putting it to the test on many Southern Utah trails. In general, I haven't had any complaints about the components. The drivetrain, front fork, dropper post, and brakes have all been really solid for types of trails I ride. However, the rear shock appears to be the achilles heal of the bike. The X-fusion 02 Pro RL shock has been a complete drag....literally. Immediately after buying the bike and having the initial setup done by a reputable bike shop, I experienced numerous pedal strikes while climbing. After learning more about proper sag and buying a shock pump, I found I needed to put in approximately 20-30psi over my body weight (190llbs) to achieve proper sag of 30%. The supposed ""lockout"" is almost non-existent; you can essentially ride full-time in the lockout position because the shock compresses to about 90% of the travel compared to when it is open. While bearable, I think an entry-level, 2-position, Rock Shox shock would have made this bike perfect.


Name:
Bump J.

Helpful?

Capable piece of equipment

Pretty good bike, and great value for money in this price range. I do more XC riding than anything else but running the Stumpjumper with a higher rear shock PSI (about 250) works great on lockout, and then I just unlock it for downhill riding. Rear derailleur seems pretty weak and is my main complaint, but the upgrade to a GX Eagle seems pretty obvious and straightfoward.


Name:
J

Helpful?

Great Value Bike

This bike has great components, a threaded BB, Great tires that are tubeless ready and the rims have tubeless tape. Great value suspension and a decent drivetrain. this bike is in every way superior to the trek Fuel EX 5. Although I have seen the Hotwalk Carbon for half the price and i am feeling silly i did not get that bundle of value.


Name:
Jim R.

Helpful?

Great Bike

I've had this bike for 2 weeks got the S3 size perfect for me I'm 5'8"". Had the bike shop do the initial setup and I've been tweaking it since then. For the price this is a great bike, The feel is really good considering that this is my first FS bike this is a big upgrade from a hardtail, The front shocks are okay the rear shock I will upgrade later the drivetrain is okay for now but as it wears out I will be upgrading it. The frame is excellent with a tapered head tube and a threaded BB making it very easy to upgrade. I love the dropper post and I've put the flip chip on the higher setting I was having some pedal strikes, all in all it rides very good uphill down hill and through rough stuff.


Name:
Db

Helpful?

A great entry-level bike with good bang for the buck

Returned to MB'ing after10 years, so not a beginner but new to all this new tech (disc brakes, dropper posts, better drivetrains...). This bike is perfect and a great value. At 6'1""and 167lbs I feel perfectly balanced and in control on the S4 size. A perfect bike to grow with. Handles anything I will put it through here in the Northeast.


Name:
Sushi B.

Helpful?

Great all around trail bike

Great all around trail bike! Eats up jumps, drops and rooty terrain. Dropper post is a life changer if you've never had one. My first FS MTB and I'm loving it!


Name:
Trent

Helpful?

Love my Stumpy!

Great climbing, good components, and very solid bike. Love it!


Name:
Dj

Helpful?

Great value Trail Bike

Love my new Alloy Stumpy. Grip, geometry, size options are all excellent. Really pleased with the feel of the shock and fork. Only weak part seems to be the rear derailleur. Good to upgrade to the GX version when it needs changing out. In regards to MTB O's comment below my LBS were able to set this bike up as tubeless with no issues whatsoever. Stock wheels and tires.


Name:
Barr H.

Helpful?

Great bike

Have been out a couple times on the trails so far and the bike has been great.


Name:
Lvh

Helpful?

Awesome bike

5'10 and got a size S3 which fits me perfectly. Love the paint job. Ride is fantastic and components work really well so far. First time with a full suspension and I couldn't be happier. Great bike and great value.


Name:
Tj

Helpful?

great brike

Bought this from my local shop after waiting for a rockhopper to come in for 4 months ,. so glad I did , I've already put 50 miles on it and it has handled great on road gravel and trail ,


Name:
John

Helpful?

Tubeless ready or not ?

I just purchased this bike and I was really excited, now I am a bit disappointed. I need a tubeless set up however the alloy model is not ? I was informed by local bike shop that they can not run tubeless on this set up. Can it be converted without spending hundreds of dollars more on new wheels ? It's disappointing.


Name:
Mtb O.

Helpful?

Awesome � i

First 2021 bought in Oklahoma City! I bought the Stumpjumper ST Alloy S4 I am 6 foot tall. Took it for a spin this evening. Perfect. Unbelievable for a so called base bike. Nothing base about this bike. . I will change the grips and pedals but that is it. Oh took the reflectors off. Let's just say I could have rolled over my neighbors car parked in the street. Lol Handled dirt and rocks like nothing. Can't wait to turn this SJ loose. Buy this Bike you will not regret it!! Heading to Bentonville. Will leave another review after the Rip Trip.


Name:
Dd

Helpful?

I would buy this product again and again

Price + ride = as close to perfection as you can get with a mountain bike.


Name:
Adam

Helpful?