Specialized Stumpjumper 650B CompLast week, Specialized quietly announced two 650B models after having spent the last year sitting on the sidelines watching the wheel size battle playout. The company’s lineup in the recent past has had been decidedly 29er centric, with only the Enduro, Stump Evo, and Enduro Evo models holding down the small wheel fort on the trail side.

This middle sized announcement comes as no surprise, since the company recently released several pairs of new 650B tires. The long wait for the new models was likely due to the fact that Specialized spec’s it’s own tires and wheels on the majority of it’s bikes. Unlike smaller manufacturers, they couldn’t rush to market without developing the supporting products that help keep the bang-for-your-buck value high.

This week several of our local shops started receiving their first shipments of the new bikes, so we stopped by two of the best Specialized Dealers in town to take a look a closer look at the new offerings. Head past the break for close up pictures, weigh ins, and a short Q&A with Global PR Manager Sean Estes!

Stumpjumper Evo 650b Comp CockpitThe comp level bike is first and features Deore level brakes, a healthy 750mm bar, and Specialized branded components throughout.

Stumpjumper Evo 650B Headset SpacerThe healthy spacer stacked on the Rockshox Revalation fork stood out, we have yet to receive official response from Specialized as to what it is for….We have more pictures and speculation further into the article.

Specialized Stumpjumper 650B Comp Dropper Post RoutingThe Comp frame has an internally routed dropper post, while the Expert Carbon model has stealth routing through the seat tube.

Stumpjumper Evo 650b Autosag Fox Float CTD ShockThe bike retains the Autosag feature found throughout the lineup.

Stumpjumper Evo 650B LinkageThe evo moniker on standard models indicated a 15mm boost in travel, one degree slacker headtube angle, and a wildly more aggressive ride…..

Stumpjumper Evo 650b Comp DrivetrainA 2×10 drivetrain and chain guide device power the Comp model uphill.

Stumpjumper Evo 650b Tire ClearanceA 2.3″ Purgatory with plenty of breathing room is standard in the rear.

Specialized Stumpjumper 650B Comp Thru AxleThis model currently retails for $3,400.

StumpJumper FSR Expert Carbon EvoSpecialized Stumpjumper 650B Carbon

The $6,500 Carbon model has an aluminum rear triangle, and features an all “new hidden Specialized Command Post IR, X01 drivetrain mated to carbon cranks, and improve suspension.


Stumjumper Evo 650B Carbon HeadtubeAlso included in the package is the SWAT chainbreaker steer tube cap, which is perched on a Specialized branded 70mm stem and aluminum handlebar.

Stumjumper Evo 650B Carbon HandlebarThe brakes are also upgraded to Shimano XT stoppers. A welcome change in the Specialized lineup from the Formula T1 brakes that were commonly spec’d on the 2014 product.

Specialized Stumpjumper 650B Carbon Badge

Stumjumper Evo 650B Carbon DowntubeThe Carbon model comes stock with clear downtube protection, a precaution we’d love to see more manufacturers adopt. Cable routing is still under the downtube, and the internal dropper routing option seen on the comp also carries over.

Stumjumper Evo 650B Carbon Crown Race Headset SpacerFor those of you as interested in that headset spacer, we bribed the shop mechanic with Racer 5 to let us get a closer look… The spacer functions as a crown race and is 10mm long.

Specialized Stumpjumper 650B Headset CrownRace SpacerWe’re not sure why Specialized has included such a tall crown race but we have some guesses. Once upon a time, particularly on small frames, frame manufacturers didn’t take into account fork clearance on the downtube. So manufacturers like Ventana produced spacers that allowed the fork to spin without clearance issues. Upon closer inspection, it does look like the frame has clearance for the fork without the spacer, but we didn’t try it.

Another popular theory is that it changes the axle to crown of the fork, to help keep geometry slack. A closer look at the geometry settings on the Specialized website shows that the company lists a “low” setting. Replacing the spacer with something less tall would certainly steepen up the headtube angle slightly. We have heard some hypothesis that the new 650B model and 29er models share the same front triangle, but we measured the steer tubes and they are not the same lengths.

Weights & Geometry

Stumpjumper Evo 650B Comp WeightThe stock size medium Specialized  650B Stumperjumper Evo Comp hit the scales at 29 lbs, 3 oz or 13.2 kg.

Specialized Stumpjumper Evo 650B Carbon WeightThe size medium Specialized 650B Stumpjumper Evo Expert Carbon equipped with a full SWAT system and some crappy plastic demo pedals weighed 27.48 lbs or 12.5 kg.

2015 Specialized Stumpjumper 650B Evo Geometry

Q&A With Global PR Manager Sean Estes


Hi All, we appreciate all the comments but wanted to set a few facts straight. Sean is actually a pretty rad dude. He lives locally, so we’re always bumping into each other on the trail and riding, and we’ve also put back more than a few adult beverages together. During the launch, Sean was actually on vacation, but was kind enough to type out some responses on his cellphone. Due to some miscommunication, he was not aware that his responses would be copy and pasted directly. He’s always been very forthcoming about information, and helped us put together some great content in the past – like this Enduro 29er video breakdown. So don’t be too hard on the guy. We have a meeting setup at Sea Otter, and will be bringing you more coverage soon. – ed (Updated 4/3 at 4:30 PM PST)

1) What other frame or feature changes were made with the 650B model intro?

None. Construction/materials are the same as the 26 and 29 versions. Some components were changed but that is reflective of the fact that these new 650b bikes are next year’s models so they have 2015 spec.

2) What were some of the distinct challenges of developing bikes for 27.5″ wheels over their slightly smaller 26″ cousins?
Due to 650b being only slightly larger in diameter than 26″ it was relatively easy, at least compared to the design challenges we overcame with the ground breaking Enduro 29, for example.

3)When did you first start playing with the 650B wheelsize and how long have these new models been in development?
We are always experimenting with prototypes – be it wheels size, geometry tweaks, tire tread and compounds, etc., etc., in search of giving riders the best possible experience every time they saddle up. Specifically, we have tested numerous 650b setups over the past few seasons, in addition to the countless other things we have tested and continue to test daily.

4) Last year Specialized had three (?) 26″ trail bikes in the lineup, all evo models. Will we see any standard (non evo) Stumpy 650B bikes, or will it just be 29ers and Evo 650B bikes?
Riders and dealers are embracing this new wheel size and our mission has always been to deliver on riders’ needs. It is safe to say we will offer more 650b bikes in the future.

5) Will there be any 26″ FSR models offered now?
All of our current product offerings can be viewed on Specilaized.com. The rest of the 2015 line will be announced later this calendar year.

Special thanks to:ABS and SVCS

If you’re in the Bay Area, you can give ABS a call at 831-427-2232

Special thanks to both  Another Bike Shop and Scotts Valley Cycle Sport, for letting us hang out and take pictures. As of yesterday, SVCS had one Comp model on the floor, and ABS has both a Comp and Expert built and ready to ride. We’d also like to give Sean Estes a shout-out for taking the time to answer all our questions.

Cob Jumping the Specialized Stumpjumper 650B Outside ABSAnd since it’s so important to pick a wheelsize and be a dick about it, we leave you with this – Locs On Spokez rider Cob getting shreddy on some little wheels.



  1. What is up with the abbreviated answers and multiple referrals to the website. I would have thought the guy would have been excited to talk and promote the new bikes. Maybe it was lost in translation.

  2. Matt, I totally agree! This guy is a GLOBAL PR manager? Please! He comes off like a d*ck! Be cool to Bikerumor, Sean Estes, they are helping to sell your bikes!

  3. sounds like specialized holds a grudge against all the people who don’t want their crappy 29ers and now they have been forced to make a 27.5 – I mean “wah wah wah” 650b.

    saris: why didn’t you ask sean estes about the big spacer?

  4. this could be one of the single greatest things to hit the bike biz in a long time. I am about to embark upon an estate liquidation sale so I can clear some space and funds to capture one of these tweeners……not so hot on the paint schemes, but nothing a rattle-can wont change…….ship me one of these already!!!

  5. call420, big spacer explained: “All of our current product offerings can be viewed on Specialized.com. The rest of the 2015 line will be announced later this calendar year.”

  6. @Call 4.20

    We sent our list of questions to Specialized before the bikes had reached dealer floors and saw the bikes for the first time yesterday. I have reached out to Sean for more info, but have not yet received an official response. We’re just as curious as you are and will update as soon as we have further info.

    The Big S usually does a press launch of their full product line in the summer. Usually around June or July if I recall correctly. They will be more forthcoming with information at that point.

  7. I have read about the Specialized attitude, but the answers given by someone that is the voice of the company certainly show no real passion for the product.

  8. Why in the world would anyone use the term 650b for mountain bikes?! It is 26″ and 29″! So, why confuse newbies and enthusiast with a metric “road bike” term.

    26″, 27.5″, and 29″ makes the most sense by far.

    They are doing this because of their beef with Giant Bicycles I can guarantee it.

  9. i cant blame the guy. 650blahblahblah. who cares?! it’s here already. just ride. who would care what any marketing guy’s general disposition is? it’s a wheel size not a skills upgrade.

  10. All – in Sean’s defense, Specialized generally runs a pretty tight ship with regards to product introductions, and in this case, they’ll be offering a formal “launch” at Sea Otter and he’s already told us we’ll get all the info about the bikes there. So, any info he was able to offer ahead of time is cool with us, that’s just the way they operate. Having met many of the folks at the company, I’m pretty sure he and everyone else at Specialized is stoked on the new bikes, sometimes hands are tied until they’re not. Yes, it’s odd the bikes fell into the marketplace without the usual hoopla, but they’re not the first big brand to do this. Consider this a teaser.

  11. I get it Tyler, but for a PR manager, he should do a little bit better job PUBLICLY RELATING. Hopefully Mr Estes reads these comments.

    Bike seems meh

    Santa Cruz Nomad seems like the right choice.

  12. Honestly? I think Specialized is 100% correct in calling this a 650b and NOT 27.5″. It’s not a 27.5″ wheel size. It’s 24mm bigger (0.9″ bigger).

    Giant was the catalyst for calling the bikes 27.5 as you recall not long ago- very late to the party and failed attempt at a line of 29ers. So “lets push hard at this ”’in between”’ wheel size and call it 27.5″ when in reality, it is just 24mm bigger than 26″.

  13. Will be interesting to see how the 650b geometry compares to the 2015 Stumpjumper FSR 29ers geometry….. the spacer thing seems a bit odd, maybe comparing the new bikes to last years (2014) geometry isn’t gonna show the full picture…

  14. Just be smart and go out and buy a Pivot Mach 6. You will be so happy you did. I have never seen a company like Pivot that every model from the Mach 4 to the Phoenix and all models in between are truly all great.

    This is why I own a Mach 429, LES 29, Mach 6 and a Vault.

  15. @Ryan
    Please go and measure a 26” wheel with a tape measure let us know the ”PRECISE” measurement, you will probably find its closer to 26.5”……
    27.5/650b is a mid size, which places it between 26 & 29ers, I think its way easier for people to relate to 27.5 as it emphasizes the tyre being between 26 & 29er. Its isnt exactly perfectly in the middle but neither are any of them precisely to the decimal depending on tyre etc.

  16. I’ve noticed a bit of speculation about the new 650b Stumpjumper EVO geometry and spacers — I’d like to clear things up.
    The main triangle is actually a re-use of the 29er Stumpy, with a 650b specific rear. The tall spacer is simply compensating for the repurposed front triangle. Hope that helps!

  17. I would bet that the spacer is for angle. It would be interesting if Spec allowed for the changing of angle with different sized spacers. Unfortunately it is more likely static and a stop-gap for a bike that is more adaptation and less original design.

  18. While everybody has there brand name preference, it’s still hard to argue with the value that Giant is offering with it’s Trance Advanced 27.5 carbon bike for under $6500… As for wheel size (26, 27.5, 29) just buy one and ride. Just remember, the “real” badasses of this sport are bombing down Whistler and Moab (Red Bull stuff) and they ain’t on 29ers… I don’t know about you guys, but those are the dudes that make me wanna go out and ride!

  19. @Ryan

    You are missing the point! There are already 2 sizes measured in INCHES! NOT metric…

    Why confuse the consumer. There are a lot of newbies researching bikes that will just be further confused.

    Lets grow the sport!

    Like @A already said neither 26 or 29 measure exact as the moniker states.

    27.5 just makes sense in the line-up of wheel sizes. This is not road biking. Also, why does it matter when Giant came out with 29ers? What does that have to do with the 27.5 wheel sizes?

  20. It should be called 650b for a very simple reason. We call 700c 700c because its metric and the country of its origin uses metric so that’s what they named it. We call 26 and 29 inch mountain bike wheels as such because that standard was created in USA and was named that way because of that fact. We call the “middle size” mountain bike wheel 650b because it is metric and it is a European standard that has actually been around for a long time.

  21. It has nothing to do with road vs mountain biking, it has to do with where the wheel size standards were created. 650b, like 650c and 700c, was created, not recently mind you, in Europe, which uses metric.

  22. Guys, why so much fight around 650b vs. 27.5, when you accepted 28inch ( ERTRO 622mm) with a fatttie on it being sold to you as a 29er ? C’mon..After all, 650b is an old size over here in Europe. It just hasn’t been used for MTB till now, only for road and tandem use.
    And when one year ago my 26inch prophet MX was stolen, I decided to go 650b as this was clearly safer investment for the future. I’m happy with this and enjoy every ride on my Ghost Cagua.

  23. @Ryan
    27’5″ is the commercial name, just as 29″
    If you take the rim measures in mm, and add a 2″ tire, which is like wheel sizes are measured, you’ll find out that 26ers are 26″ poin zerozero something, 27’5 are almost 27″, and 29ers are almost 28’5″.
    If we can live calling them 29ers, we’ll be able to do it calling 650b as 27’5.
    And, for the record, if we wrap 2’25″tires to the rims, we will get 29″, 27’5″, and 26’5″.

  24. I’m sorry for you poor mortals that do not understand that probably S people are forbidden to talk about new products unless thay are authorized to do so.
    Thank you BR for the great article. The bikes look good,the spacer is fugly and finally a wise decision about getting some properly working brakes,bravo Morgan Hill guys.

  25. @six50BEE
    Disregarding tyre height and width what is the size difference between 700c and 29″?
    How do YOU distinguish/relate these two sizes?

  26. DIRT: 12″, 16″, 20″, 22″, 24″, 26″, 27″, 29″
    ROAD: 650c, 700c
    Yes there are other sizes not mentioned here but these are the common sizes. Why add 650B to dirt wheel sizing? It’s does not make sense. A few years from now it will be 27.5″ or simply 27″. 650B name will die out in USA. Canada and Europe will continue to use 650B I’m sure. Side note: On my fourth 27″ bike now and been riding 27″ for a few years and love it. Still has the that BMX feel on the right bike set up and similar to 26″ on handling. 29″ never worked for my type of riding in general but have had fun on it as well. Just too stable and mellow for me. My friend loves the stability of 29″ so it depends on the rider’s style and where you ride. Whistler 26″ and maybe 27″.

    Oh and agree w/ Dave – no more EVO. It’s silly that every company has an EVO product.

  27. It doesn’t make much sense to keep on weighing bikes WITHOUT PEDALS! A set of average clipless pedals weighs about 350 g or 0.75 lb (more for platforms) so the actual weights of these bikes should be more like 30 lb and 28.25 lb respectively.

  28. Jerome- I agree. Although, I think they should weigh the bike with a rider on it too. Clearly it’s not going to be on the trails without a rider, and even though the weights vary slightly and are specific to the individual, that’s no reason they can’t give us an estimate with someone in the shop weighing 150-160lbs jumping on the scale. And a camelback. And tools. Because I don’t want to do basic math on my own and need the scale to spit out a number for me.

  29. @Jerome: I disagree. It is easiest to leave it off and let people add their known pedal weight vs guess the weight for any pedal added and calculate the difference vs their own pedals.

    @Out for a Ride: Nailed it!

    @Tom: That is the running theory (one that I think is likely), but I have yet to see conclusive evidence at this time.

  30. Maybe it’s the engineer in me, but I prefer the short, fact based answers given here over the over-hyped BS marketing drivel we are usually fed. Keep it short, simple, and honest. No changes? Great, just say so. Don’t pretend simple tweaks are some groundbreaking innovation. I don’t need to hear about “bold new graphics”, “flickability”, or comparison to a scalded monkey or cat…

  31. I would expect them to have a shorter chain stay and wheel base than the enduro 29?

    Specialized Enduro 29 430 67,5 1.159
    Specialized Stumpy 27,5 435 68,0 1.165


  32. @Marcus: That is a bad assumption. You need to be comparing Stumpy Evo’s between each other (26, 650b, 29).

    Specialized went to great effort to shorten chainstays on the the Enduro 29 and even created a new derailleur and mounting to all clearance for front shifting. The travel, angles & intended usage is different between the Stumpy Evo & Enduro.

  33. @chader: evo is a marketing thing but geometry is about numbers.
    And you do can compare across whell sizes in the search for yor type of ride.
    Most of Enduro 29 hype comes from his chain stay lenght but Spz has not trickled down to stumpys and now to 27.5.
    I like tight switch back kind of trial and 26 is not longer an option for new bike so i was dreaming with a 27,5 with shorter chain and wheel base than the current Enduro 29.


  34. EVO is not just marketing. The EVO model is different (more slack) when compared to the otherwise identical model in the line.

    The Enduro vs EVO is about travel and angles. The Enduro has more travel and slacker angles than the EVO Stumpy.

    Their line has progression
    Epic -> Camber -> Stumpy -> Stumpy Evo -> Enduro -> Enduro Evo, etc.

    Each step adds travel and flattens the head and seat tube angles for more aggressive riding. Call it what you want, but there are measurable differences between each step in the line.

  35. The EVO model is a custom spec/geometry for the AGGRESSIVE Trail Rider, this adaptation has made the 29er more appealing to riders concerned with the responsiveness of bigger wheels down steep and twisty technical terrain. My speculation is that the EVO lineup will be condensed to only the 27.5 wheel MTB’s to create a simplified lineup as Specialized will need to differentiate the very complex range of MTB’s.

    @Chader you forgot the Epic WC and Camber EVO models in your model lineup, not too mention 26/27.5/29…..

  36. @A: Interesting differences in the markets. I should have guessed that because Specialized seems to have trouble selling the 29″ overseas. Now they have the mid-sze option that appears to be more desirable there.

  37. Looks great and I am sure it rides great too! My one biggest peeve which I just can’t understand why Specialized can’t make internal cable routing on their mountain bikes standard! Really, it takes that much more cost and effort to do it? Come on Specialized for that price we should be getting a clean looking internal routed cabling setup. No excuses!!! I can only understand it not being done on the low end models the save those last few dollars and be competitive in price. So many other smaller brands are doing it and it looks great too! Once it’s figured out it probably takes the same time to go internal or only a fraction more time than external routing. Specialized is only doing it on some of there highest end road bikes and the s-works hardtail Stumpjumpers from what I can tell. My biggest guess is that since the cables are running directly under the bottom bracket they are protecting the Frame from damage, its cheaper to damage a cable and replace it than a frame! For the price these bikes are now a days there is no excuse at all to have the cables internally routed!

  38. @LMStuff: All 2014 SL4 road bikes now feature internal cable routing, as for the MTB’s it makes more sense running full length housing on the underside of the frame as it prevents dirt from getting inside and messing with the indexing it also provides a more direct route with fewer bends. I do agree that it looks sleeker but in a lot of situations its more practical especially when there’s linkages involved. I think that alto of the lower end bikes utilize older recycled designs hence the lack of improved features.

  39. Just bought one of these bikes. Haven’t rode it yet. But first impression is good smooth lines,Great components.
    But like most post here are the first complaints or things that would inhance. Paint- seamed to be subseptible oils for staining. In building the bike just finger prints showed, kinda like stainless steel. Cable routing- mostly external and on the underside of the down tube, while it helps big S keep a nice billboard on the trail, I find it hard to keep clean as it collects all debris from the front tire.
    Routing of cables under the bottom bracket is terrible. There is no cable guides on the bottom bracket to control the routing so I had to zip tie the cables together to stabilize them and keep them out of the left crank arms. Alluminum rear triangle, other companies are building all carbon. Command post IR- is routed down the down tube then then routed up the seat tube, so semi internal. Seat feels hard and uncomfortable, time will tell. Last complaint is about the command post not the bike. Cable routing and setup took 2X longer than putting the whole bike together. Integration of the handlebar actuator and XT brake lever is very after market and not clean, looks like an afterthought. But if your building your own bike, and you own the company, you should look at every detail and design around the bike. These are small things in the over all picture and if the bike rides like I expect it to, then who cares. Just at this price point Specialized should provide the best mony can buy. The Bike is set up and ready to go, I hope the ride is as good as the hype. Still haven’t sold my carbon 26’er.

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