Pivot Mach 4 275 xc trail bike carbon (16)

Pivot Cycles has a lot of bikes in the current line up, but the Mach 4 has been around since the beginning. As the very first Pivot back in 2007 when Chris Cocalis started the company after his stint with Titus Bikes, the Mach 4 was the introduction to the Pivot way – DW Link equipped, high quality, confidence inspiring full suspension bikes. A lot has changed since those early days, not only with bike construction, but in the way people ride. After the introduction of the successful Mach 429 and longer travel 27.5″ bikes, it was time to revisit the 26″, aluminum Mach 4.

In typical Cocalis fashion, the Mach 4 isn’t just a larger wheeled version of the original, but a complete redesign that integrates almost every industry standard you can think of in a sexy, light weight package.

Integrate yourself with the details, next…

Pivot Mach 4 275 xc trail bike carbon (1)

Pivot Mach 4 275 xc trail bike carbon (22) Pivot Mach 4 275 xc trail bike carbon (20)

Starting with the same 100mm of travel as the original, Chris quickly realized that the 27.5″ wheels caused you to want to push the bike harder than your typical XC machine. Looking to add a bit more trail worthiness to the ride, Chris played tested a number of travel settings but found that up to 115mm of travel still provided the same snappy, XC characteristics of the 100mm design. But anything over 116mm transferred into the realm of specific trail bikes, and with travel between 115-125mm, the descending characteristics didn’t really change. Settling on the sweet spot of 115mm, the travel provides the ideal mix of XC pedal efficiency and Trail capability that riders are starting to look for in short travel, aggressive bikes.

Now in its fourth generation, the new carbon Mach 4 will be sold with a 120mm fork, though it can be equipped with 100mm forks for more XC riding. Pivot worked a lot with Fox for rear shock to produce a tune that would allow for both race and trail sag settings with their own indicator. Set at around 27% for the race setting, the bike will see more ramp up at end of stroke for similar pedaling performance as if it were a 100mm travel bike. Set up the Mach 4 in the Trail setting though, and you will be rewarded with a lower bb, slacker head angle, and more linear travel that is easier to use the full amount. Chris expects most riders to use the Trail setting, but the Race setting is there when you need it.

The suspension settings compliment the new geometry which is based on the industry trend of offering more aggressive angles in shorter travel bikes. When Pivot introduced the Les 27.5 hard tail, Cocalis likened it to a big BMX bike with a slacker head angle and more fun factor but keeping the XC capabilities. The same is true with the Mach 4 which is built with a 68.2 degree HTA and 72 degree STA with a 120mm fork. Switching to a 100mm travel fork changes it to a 69.2 HTA, and 73 degree STA.

Sold in XS, S, M, and L, Cocalis was particularly excited about the XS size stating that it has a lower stand over than their old XXS 26″ bikes. In addition the bike has a different shock so smaller riders can run the same pressures so the valving on the shocks stays the same, along with a few other tweaks in geometry to help smaller rider get the most from their bikes. Top tube lengths range from 21.85-24.50″ for the large, which still may leave taller riders reaching for the Mach 429 carbon instead (which taller riders are more likely to do anyways).

Pivot Mach 4 275 xc trail bike carbon (19) Pivot Mach 4 275 xc trail bike carbon (17)

Pivot Mach 4 275 xc trail bike carbon (25)

Pivot Mach 4 275 xc trail bike carbon (3) Pivot Mach 4 275 xc trail bike carbon (2)

Seeing as how Shimano just introduced their first Di2 mountain bike group, one of the most fun aspects of the process for Chris was figuring out how to make a bike that was compatible with everything, yet still offered a clean design. The result is what he is calling the first fully integrated Di2 mountain bike frame on the market. Chris has never been a huge fan of internal cable routing, but it’s a feature that many riders look for so he set out to create a system of cable guides that satisfied his preferences. Each custom cable port is made so that it not only seals the frame, but puts a slight amount of pressure on the cable to keep it from rattling or moving. Everything is incredibly easy to install and route, and the guides allow for mechanical 1x or 2x drive trains with standard top pull, or new Shimano Side swing front derailleurs, internal droppers, suspension lock outs, and of course Di2…

Pivot Mach 4 275 xc trail bike carbon (4)

Let’s be honest, few people shelling out the money for XTR Di2 will be happy with the external battery, so Pivot figured out a clever way to integrate it into the frame. These pieces are still rapid prototypes, but they demonstrate how the battery will be inserted into the down tube and up into the seat tube from the bottom. This not only allows for dropper posts with an internal battery, but also provides a huge access hole to make internal routing of junction boxes, or mechanical cables as easy as possible.

Pivot Mach 4 275 xc trail bike carbon (18)

When all bolted up, the upper battery mount bolt also acts as the upper bottle cage attachment for the lower mount. There is a second cage mount inside the front triangle. Like the rest of the Pivot carbon bikes, the Mach 4 has a rubberized leather downtube and chainstay protector to protect your frame from rocks.

The rear derailleur housing is routed over the BB92 bottom bracket in the cleanest route possible. When used with mechanical drive trains, the frame supports full derailleur housing. At this point most of the other specifications have become more or less standard with post mount disc brakes, 142x12mm rear axle, and tapered head tube.

Pivot Mach 4 275 xc trail bike carbon (21)

Pivot Mach 4 275 xc trail bike carbon (24) Pivot Mach 4 275 xc trail bike carbon (23)

Mach 4s will ship with custom tuned Fox Float CTD Kashima rear shocks, which are mounted to a wider top link and larger Enduro Max lower bearings for improved frame stiffness. Of course the carbon frame itself deserves some notice with the new composite frame replacing the previous Mach 4’s aluminum skin with Pivot’s Hollow Box internal molding technology.

Pivot Mach 4 275 xc trail bike carbon (10) Pivot Mach 4 275 xc trail bike carbon (11)

Pivot Mach 4 275 xc trail bike carbon (13)

Officially the lightest full suspension bike pivot has ever made, the Mach 4 comes in right at 5.1lbs for the frame and this particular complete build came in at 22.08 lbs.

Mach 4s will be sold in 11 different complete builds including the entry level SLX at $4,499 to the XTR Di2 2X group at $8,999. Frames will also be available alone with a Fox CTD Kashima shock for $2,899 or as a frame kit that will include a Fox F120 CTD Kashima fork, Pivot HS, and Shimano or SRAM BB for $3,799. Expect to see these hitting your local shop floor this August.

Mach 4 geometry



  1. I owned a Mach 4, and it was an XC race bike at its core. Seems like the new bike is slacker, has bigger wheels, and most importantly has 4.5″ of travel. Seems like this is the wrong bike to be the namesake. Maybe it could have been a Mach 4.5.

    Besides that is looks nice. All the Di2 stuff is cool, even if it’s out of the average rider’s budget.

  2. When will the affordable alloy version be released? Sad to see aluminum disappearing. The Mach 4 was one of the most beautiful bikes available, IMO. Not a fan of all the swoops and curves of carbon.

  3. Geesh bikes are getting hi-tech. With that said, I was shocked to see a Di2 equipped bike for $9000 (with the bro-bra deal should be in the $7k-$8k range). I thought it would be well over $11k. Way to go Pivot.

  4. would someone design some “classic” strait carbon tube designed mtbs, instead of all these wavy, curved, and humped back tube designs. (the turner czar seems to be one of the few decent looking out there. IMO)

    just because you can make all these wavy/curvy carbon frame shapes and designs, doesn’t mean you should. yah, it should be about how it rides, but come on…

  5. Love Pivot!! See what they did there? No XL version. Because they know us big riders should be on 29″ wheels when it comes to XC bikes.

  6. I hate to echo K11 and the negativity far too often enveloping the forums, but the aesthetics just don’t work for me. I have little doubt this would be the perfect bike for me, but the swoopy humps don’t open my wallet.

  7. I love seeing a thoughtfully conceptualized XC full-suspension frame use 27.5 wheels. Love it! I really hope that we see more framebuilders take on this particular niche, more “racy” 27.5 full-suspension, because it seems like there’s a ton of potential here to really establish something special.

    That said, this frame fell out of the ugly tree and hit every branch on the way down. It looks like it’s been in a warehouse fire… Probably rides great, though, but if I’m spending big $$$$ on a frame, it’s got to look good *and* perform. I’m holding my breath for a Turner Czar 27.5…

  8. @the fork.
    i too would love to see a turner czar 27.5 (slightly slacker). Patiently waiting for something like the original/classic santa cruz blur w/ medium sized wheels and more rear tire room.

  9. wow. xc platform back to a smaller wheel size. that didn’t take long. if you’re in marketing shoot yourself. now.

  10. @K11, I hear yo about the swoopy humpy frame curves – I’m not a big fan of the look of this bike either. But when you think about it, most of the curves are there for a good engineering reason. The curved TT decreases the standover height. The S-curved down tube allows them to shorten the head tube (lowing the front end) while still clearing the front wheel (particularly important as fork travel gets longer), and gives space in the triangle for a bottle.
    The forward offset seat tube allows them to optimise pivot placement and run a really short linkage, decreasing flex/leverage on the bearings. The curvature in the ST is necessary to get the seat in the right place at the same time.

  11. For some time now I have been hoping that Pivot would release a 27.5 PM4. I really like the first generation PM4 with its Titus Racer X looks, snappy response and handling. However, I have the same sentiments that this new version is not the most attractive looking frame. It looks like a “me too” design. In fact, the first thought was that it was a Specialized Safire or Stumpjumper.

    I’m sure it has all the same handling qualities that make Pivot so well regarded but it would have been nice to add a little more spice to the look. I’ll wait to see it in the flesh before making a final conclusion.

  12. @dsut4392. i agree with what you are saying, the humped top tube seems to be fading away (because, most decreased stand over for the sake of looks), now they are going the opposite extreme. a happy medium would be nice.

  13. I got give Chris Cocalis credit for being one hell of a bike designer I can see he made some really clever trade offs in this design. My only problem is I want Chris to do an updated version of my much loved Titus Racer-X in a carbon 27.5″ version. What you say Chris, the Patent for the Horest Link is now expired???

  14. Seems like slack, short (100-120mm) travel 650B bikes are what’s “in” for 2015. First the Trek Fuel EX, then the GT Helion, now this.
    The Saracen Kili Flyer was one of the first though (although it’s too heavy to compete with these guys). Not to mention the Turner Flux 27.5.
    I like the idea.
    But with 29ers being so good nowadays, I can’t help but think that if I was on this type of 650B bike, I would always be wondering if it was better with 29″ wheels… hmmm…

  15. Big holes in the frame to compromise strength and a loopy rear dérailleur cable that is routed under the bottom bracket to maximise impact damage and perfect for picking up sticks!

  16. Wow, they finally fixed the crappy cable routing! That bike looks good! Now they should change the cable routing on the Mach6 as well to clean it up.

  17. I usually do think bike aesthetics are important, but in this case I’m not in agreement with the majority of comments here. Maybe mostly because I read the specs before getting a good look at it, and it sounds like exactly the bike for me, and is exactly what I was hoping Pivot would do with a carbon Mach 4. I want something light and efficient and fun for long days with lots of climbing; this should do just fine 🙂 🙂 Oh, and even trying to look at it with a critical eye for the lines, I think it looks nice. In the eye of the beer holder and all that…

  18. I rode the Mach 4 with the 120 front at the Interbike demo days in Bootleg canyon. What a bike. Super fast and twitchy in a good way. Very quick direction changes without an issue. On the banked turns the bike just carved, very stable and planted to the ground. Not as plush in the rear as I would have liked however. The 429 carbon was amazing as well. Super quick, flickable and plush. Pivot really stole the show at the Demo days.

    • @BRyhlick, personally I prefer 27.5″ wheels on full suspension bikes so I would take the 4c over the 429 any day. But if you like the 29s, the 429 is a great bike.

  19. “Chris quickly realized that the 27.5″ wheels caused you to want to push the bike harder than your typical XC machine” To think of all those downhill champions that for decades were holding back because of 26 wheels!!!

What do you think?