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So you want to buy a Specialized Stumpjumper?

By Bruce Lin

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used Specialized stumpjumper mountain bike The “Stumpy” is the most iconic and popular mountain bike ever produced. Today, it is the epitome of quiver-killer trail bikes, the type of machine that can tackle everything from long cross-country rides to gnarly enduro stages.

Browse our used mountain bike inventory and you’ll find a huge selection of Stumpjumpers to choose from. But which one is right for you?

The Stumpjumper has changed a lot over the years, especially in the last five, as it has undergone three major redesigns. Now, there are multiple versions available on the used market with different wheel sizes, suspension travel, geometry, and other features. This guide will dive into the three most recent generations, explaining what makes each Stumpjumper unique, so you can make the right choice when purchasing your next bike.

Contents

The history of the Stumpjumper

Specialized introduced the Stumpjumper in 1981, the first mass-production mountain bike. In the early days of the sport, riders had to choose between cruisers modified for off-road use (often known as “klunkers”) or expensive custom bikes made by a few small builders.Stumpjumper Classic vintage mountain bikeThis 2007 Stumpjumper Classic is a reproduction of the original Stumpjumper, made to celebrate its 25th anniversary.

The Stumpjumper was an affordable alternative that matched the geometry and performance of custom, purpose-built mountain bikes. The original Stumpjumper produced in Japan was based on a custom Lighthouse Cycles Chaparral mountain bike designed by Tim Neenan. The Stumpjumper is considered historically significant enough to be on display in the Smithsonian.

Ned Overend Stumpjumper M2 Norba vintage mountain bikeNed Overend's race-winning 1992 Stumpjumper M2.

As mountain biking evolved, so did the Stumpjumper. The original was a fully-rigid, steel-framed XC bike. In 1991, Specialized introduced the first Stumpjumper M2 which used a lightweight aluminum frame. Former world champion and legendary XC racer Ned Overend rode the Stumpjumper M2 hardtail to win the NORBA national championships in 1991 and 1992, along with two World Cup victories.

Stumpjumper Pro 29 hardtail mountain bikeA 2016 Stumpjumper Pro 29 HT, the final year of the Stumpjumper hardtail.

The hardtail version of the Stumpjumper (sometimes named “Stumpjumper HT”) was the flagship XC hardtail in Specialized’s line-up until 2017 when it was replaced with the Epic Hardtail. The Stumpjumper HT has since been discontinued, and for the purpose of simplicity, this guide will only focus on full-suspension models.

Specialized stumpjumper fsr 4 bar horst link suspensionThe Stumpujumper's famous FSR suspension is easy to identify thanks to the pivot just in front of the rear axle. 

In 1993, Specialized introduced the first full-suspension Stumpjumper, the Stumpjumper FSR. It used Specialized’s FSR suspension system, which stands for “Future Shock Rear,” a "four-bar" suspension or "Horst-link" design. This design has been used on all full-suspension Stumpjumpers with the exception of the new 2021+ carbon Stumpjumper.

Specialized Stumpjumper Miranda Miller descending downhill enduroFormer downhill world champion Miranda Miller descending hard on a 2019 S-Works Stumpjumper. Photo courtesy of Specialized Bicycles.

Over time, the full-suspension Stumpjumper evolved from an XC bike into a mid-travel trail bike. It now caters to riders who want a capable all-rounder for both climbing and descending. Proving its modern descending prowess, former world champion Jared Graves raced the Stumpjumper in the Enduro World Series from 2016-2019 and won the Aspen/Snowmass round in 2017. For the majority of trail riders, the Stumpjumper is the perfect do-it-all bike.

Stumpjumper build levels explained

Specialized S-Works Stumpjumper mountain bikeS-Works Stumpjumpers are easy to identify thanks to the S-Works banding. 

Specialized offers the Stumpjumper in different component trims, which are indicated by the model name. The Stumpjumper hierarchy ranked from lowest to highest is:

  • Comp
  • Expert
  • Pro
  • S-Works

These builds vary in the component spec level. For example, as an entry-level build, a Stumpjumper Comp will use less expensive, entry-level components (cockpit, suspension, drivetrain, wheels), while the premium offering, an S-Works Stumpjumper, will use top-of-the-line componentry. In general, higher-end builds are more refined, lighter, and have better resale value.

Stumpjumper Comp models are also available with either carbon or aluminum frames. This is often designated in the model name (e.g. Stumpjumper Comp Alloy vs. Stumpjumper Comp Carbon).

For 2019+ models, Specialized also offers a base-level Stumpjumper below Comp, with an aluminum frame and basic components.

Some special-edition models like the Stumpjumper Coil and Stumpjumper Pemberton LTD Edition fall outside the normal hierarchy but are generally around the Pro or S-Works level. 

2016-2018 Stumpjumper models

This generation of Stumpjumper came in three versions based on wheel size:

Highlights:
  • This is the first Stumpjumper generation with Boost hub spacing — a 12x148mm rear axle and 15x110mm fork.
  • All models use proprietary rear shocks with “Autosag,” which helps riders easily dial-in suspension sag. To set-up, over-inflate the air chamber so the bike is totally extended, sit on the bike with the shock fully open, then press the Autosag button to bleed out the excess air. It automatically sets the Stumpjumper to around 25% sag.
  • Because of the proprietary shock mount, this generation Stumpjumper is not compatible with aftermarket shocks. However, custom aftermarket suspension yokes are available if riders wish to swap the Specialized specific shock for an aftermarket shock.
  • This is the first generation to use the Specialized SWAT door, a storage system built into the downtube for carrying spare tubes, tools, food, or other small items. The SWAT door is only available on carbon models.
  • The Stumpjumper Comp Carbon and Expert frames are built with a FACT 9m carbon front triangle and the M5 aluminum rear triangle.
  • Stumpjumper Pro and S-Works frames are full carbon, with a FACT 11m carbon front and rear triangle.
Stumpjumper 29

Specialized Stumpjumper 29 carbon mountain bike2018 Stumpjumper Comp Carbon 29 sold at The Pro's Closet

Wheel size: 29”
Suspension travel: 150mm front / 135mm rear
Head tube angle: 67°
Seat tube angle: 74°
Reach: 413mm (M) / 431mm (L)

Stumpjumper 650b

Stumpjumper carbon 27.5 mountian bike2018 Stumpjumper Comp Carbon 650b sold at The Pro's Closet

Wheel size: 27.5”
Suspension travel: 150mm front / 150mm rear
Head tube angle: 67°
Seat tube angle: 74°
Reach: 413mm (M) / 431mm (L)

Stumpjumper 6Fattie

This is the only Stumpjumper generation to offer the 6Fattie version, which uses 2.8-3.0” wide 27.5-plus tires for more comfort and traction.

Stumpjumper carbon 6Fattie 27.5 plus mountain bike2018 S-Works Stumpjumper 6Fattie sold at The Pro's Closet

Wheel size: 27.5” Plus
Suspension travel: 150mm front / 135mm rear
Head tube angle: 67°
Seat tube angle: 74°
Reach: 413mm (M) / 431mm (L)

2019-2020 Stumpjumper models

This generation of Stumpjumper came in six versions offering different options for suspension travel, geometry, and wheel size:

Highlights:
  • Redesigned from the ground up with an asymmetric carbon frame based on the previous generation’s Specialized Demo downhill bike. A carbon arm extends around the right side of the rear shock adding support and lateral stiffness for better tracking through rough terrain.
  • Geometry was tweaked to be slightly longer and slacker than the previous generation.
  • The suspension kinematics were made more progressive to reduce bottom-out during big hits.
  • The proprietary shock mount and Autosag were eliminated, so this generation Stumpjumper is compatible with most aftermarket shocks.
  • A flip chip was added to the rear shock yoke to adjust between high and low geometry positions. Bikes come from the factory in the low position. Flipping to the high position steepens the head angle 0.5° and raises the bottom bracket 6mm for more agility.
  • All carbon frames from Comp to S-Works use a full carbon FACT 11m front and rear triangle.
  • SWAT door on carbon models.
  • Specialized also introduced the Stumpjumper ST or “short travel” variant and reintroduced the downhill-focused Stumpjumper EVO variant.
  • The Stumpjumper 6Fattie was discontinued for the 2019 model year, but Stumpjumper 27.5 models have enough clearance to fit up to 27.5 x 3.0" plus tires.
Stumpjumper 29

S-Works Stumpjumper 29 mountain bike2019 S-works Stumpjumper 29 sold at The Pro's Closet. 

Wheel size: 29”
Suspension travel: 150mm front / 140mm rear
Head tube angle: 66.5°
Seat tube angle: 74.8°
Reach: 425mm (M) / 445mm (L)

Stumpjumper 27.5

Specialized S-works stumpjumper 27.5 mountain bike2019 S-works Stumpjumper 27.5 sold at The Pro's Closet

Wheel size: 27.5”
Suspension travel: 150mm front / 150mm rear
Head tube angle: 65.5°
Seat tube angle: 75°
Reach: 435mm (M) / 455mm (L)

Stumpjumper ST

The Stumpjumper ST takes the standard Stumpjumper platform and reduces the travel by 20mm. The reduced travel combined with slightly steeper geometry means the bike will feel more agile and efficient than the standard Stumpjumper, ideal for people who ride mellower trails. The Stumpjumper ST replaced the Camber in Specialized’s line-up.

Stumpjumper ST 29

Specialized stumpjumper st short travel mountain bike2019 Stumpjumper ST Comp Carbon 29 Womens sold at The Pro's Closet

Wheel size: 29”
Suspension travel: 130mm front / 120mm rear
Head tube angle: 67.5°
Seat tube angle: 75.5°
Reach: 435mm (M) / 455mm (L)

Stumpjumper ST 27.5

Specialized stumpjumper ST 27.5 short travel mountain bike2019 S-Works Stumpjumper ST 27.5 sold at The Pro's Closet

Wheel size: 27.5”
Suspension travel: 130mm front / 130mm rear
Head tube angle: 66.5°
Seat tube angle: 76°
Reach: 444mm (M) / 465mm (L)

Stumpjumper EVO

To increase downhill performance, Specialized experimented with the Stumpjumper’s geometry. The Stumpjumper EVO had a longer reach and an impressively slack 63.5-degree head tube, making it the most progressive bike in Specialized’s line-up at the time. It was also the first Stumpjumper to come equipped with a reduced offset fork

The 2019 Stumpjumper Evo also was the first to use Specialized’s S-sizing system. This does away with traditional small, medium, and large sizes, and focuses on reach and wheelbase. Standover clearance and stack height remain relatively low across sizes, so riders can choose their size based on their desired length.

This generation Stumpjumper EVO only came in two sizes, S2 and S3, which roughly equate to medium and large.

Stumpjumper EVO 29

Specialized stumpjumper EVO Carbon 29 mountain bike2020 Stumpjumper EVO Carbon Comp 29 sold at The Pro's Closet

Wheel size: 29”
Suspension travel: 150mm front / 140mm rear
Head tube angle: 63.5°
Seat tube angle: 76° (S2) / 75.6° (S3)
Reach: 445mm (S2) / 475mm (S3)

Stumpjumper EVO 27.5

Specialized Stumpjumper EVO Carbon 27.5 mountain bike2019 Stumpjumper EVO Pro Carbon 27.5 with coil shock sold at The Pro's Closet

Wheel size: 27.5”
Suspension travel: 150mm front / 150mm rear
Head tube angle: 63.5°
Seat tube angle: 76° (S2) / 75.6° (S3)
Reach: 465mm (S2) / 490mm (S3)

2021+ Stumpjumper models

This generation of Stumpjumper comes in two versions with different suspension travel and geometry:

Highlights:
  • All new Stumpjumpers use Specialized’s S-sizing system like the previous-generation Evo. Sizes are available from S1 to S6, giving riders a huge range of options.
  • Geometry has been revised with significantly longer reach, slacker head tube angles, and steeper seat tube angles to match modern geometry trends.
  • All models are now equipped with reduced offset forks.
  • The carbon Stumpjumper features a completely new suspension design focused on reduced weight and improved efficiency.
  • The Stumpjumper EVO introduces more adjustability for head angle, bottom bracket height, and wheel size.
  • All carbon frames from Comp to S-Works use a full carbon FACT 11m front and rear triangle.
  • SWAT door on carbon models
  • The short-travel Stumpjumper ST has been discontinued. Riders looking for a similar short-travel trail bike should look to the 2021 Epic EVO.
Stumpjumper

The carbon 2021+ Stumpjumper is the first full-suspension Stumpjumper to not use an FSR suspension system. It has switched to a linkage-driven single pivot design with carbon flex-stays. This is the same system used on the new 2021+ Specialized Epic. It eliminates moving parts to reduce weight while also improving pedaling efficiency.

Because the entry-level Stumpjumper Alloy uses an aluminum rear triangle, it continues to use the more traditional four-bar FSR system.

The suspension flip chip is still present and can be flipped to the high position which steepens the head angle 0.5° and raises the bottom bracket 7mm for more agility.

2021 Specialized stumpjumper comp mountain bike2021 Stumpjumper Comp sold at The Pro's Closet

Wheel size: 29”
Suspension travel: 140mm front / 130mm rear
Head tube angle: 65°
Seat tube angle: 76°
Reach: 430mm (S2) / 450mm (S3) / 475mm (S4) / 500mm (S5)

Stumpjumper EVO

The new Stumpjumper EVO maximizes geometry adjustability. A headset insert allows for 1° of head angle adjustment in either direction. A chip on the chainstays allows for another 0.5° of head angle adjustment accompanied by 10mm of bottom bracket adjustment. This means the head angle can be changed from 63° to 65.5°.

In total there are six possible configurations that allow riders to adjust the bike to suit their riding style or terrain, and adjustment should only take a few minutes. Specialized also has a geometry finder that can help riders select the geometry settings for their needs. The Stumpjumper EVO comes from the factory in the middle/high position, with a 64.5° head angle.

The largest two sizes, S5 and S6, also have longer chainstays to help accommodate taller riders and keep them more centered on the bike.

Specialized also states that the Stumpjumper EVO can also be set-up in “mullet-mode” with a 27.5” rear wheel for riders seeking more agility or tire clearance.

The Stumpjumper EVO is currently only available with a carbon frame. 

2021 Specialized Stumpjumper evo comp mountain bike2021 Stumpjumper EVO Comp

Wheel size: 29” (Mullet compatible)
Suspension travel: 160mm (S2-S6), 150mm (S1) front / 150mm rear
Head tube angle: 64.5° (adjustable from 63° to 65.5°)
Seat tube angle: 77.6° (S2) / 77.2° (S3) / 76.9° (S4) / 77° (S5)
Reach: 428mm (S2) / 448mm (S3) / 475mm (S4) / 498mm (S5)

 

Which Stumpjumper are you riding? Or which do you hope to ride? Let us know in the comments!


9 comments


  • I have a 91 stun jumper pro All original , never off rode in in credible shape and would sell for the right offer

    Eric on

  • I just bought a 2022 stumpy pro and I am trying to find out if I can fit a 2.5” tire in front. I know that the listed max is 2.4 but has anyone tried it?

    Tom on

  • Hey Michael,

    So the big goal with the new Stumpy was to have it pedal more efficiently than the previous model. I don’t know specific numbers, but I can tell you that the kinematics of the 2021+ Stumpjumper are designed with this in mind. It’s different enough that Specialized also specs it with a new shock with a “digressive” compression and “custom progressive” rebound tune. This all creates a solid pedaling platform early in the travel.

    If you’ve ever ridden the previous generation Stumpy, it’s a very active feeling suspension that often requires riders to use the lockout/climb switch on the shock for climbs. With the new design, you can leave the shock open and the bike will bob less and resist squatting on climbs. Then the shock tune allows it to still absorb big hits like the previous model, and rebound quickly from these hits without bucking you.

    Not only that, the 2021+ suspension design has a more progressive leverage curve than the previous design (19% progression vs. ~15%). The new leverage curve is intended for larger volume air shocks to provide a gradual spring ramp-up. Specialized says this allows the new Stumpjumper to use more travel over small and medium bumps, with a sharp progression at the end of the travel to tame bigger hits.

    Overall, these are not earth-shattering changes, but rather refinements toward a specific goal. The new 2021+ Stumpy definitely feels pretty different. It’s much more sporty and efficient on climbs compared to its predecessor. I think Specialized really wanted to make the new generation Stumpy feel more distinct from the Stumpy Evo, which retains the active, supple feel of the 4-bar FSR design for more rugged, downhill-focused riding.

    Hope that answers your question!

    Bruce Lin on

  • Yes you may use a different name for the 2021 vs the 2020. But how close are they kinematically? They appear to be quite close.

    Michael Wilson on

  • Hey Michael. I think I get what you’re asking. Yes, with two different suspension platforms (i.e. 4-bar and linkage-driven single pivot) you could design them to have the same suspension kinematics. And yes, even if the kinematics are the same, the design and layout of the two suspension platforms are different and they are called different names.

    Bruce Lin on

  • I do not see how Adam is wrong. The geometries for the 2021 appear to be very similar to the 2020. Changing the from the pivot to flexible components may be fundamental in one sense, but if the geometries are the same then it is not fundamental in the geometric sense, only in the method of achieving that geometry.
    Please explain how I am wrong.

    Michael Wilson on

  • Hey Adam,

    Thanks for the question. Fundamentally, no, eliminating the chainstay pivot on the new Stumpy eliminates one of the “bars” so it technically can’t be a 4-bar design. (In a 4-bar the “bars” are chainstay, seatstay, rocker, and shock, which roughly form a parallelogram.)

    In the linkage-driven single pivot, the seatstays and chainstays are a single unit moving on a single main pivot. That’s why it’s a single pivot. But unlike an old-school single pivots where the rear triangle directly drives the shock, the addition of a linkage and flex stays allows engineers to fine-tune the axle path and kinematics.

    Hope that’s enough explanation!

    Bruce Lin on

  • What is the difference between the ‘linkage driven’ design in the 2021 vs the 4 bar design in the 2019-2020? Even though the rear pivot is eliminated in favor of the flex stays, isn’t it still fundamentally the same suspension design?

    Adam on

  • 2020 Stumpy Evo Troy Lee Designs S2 custom build, will be riding soon as my shoulder heals up.

    Justin on


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