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Pivot Mach 4 SL Carbon Pro X01 Eagle Mountain Bike


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Mach 4 SL Carbon Pro X01 Eagle Mountain Bike

Lift laps and shuttles have a time and a place, but that place isn't anywhere close to your summer agenda. You prefer fast rolling cross-country hot laps, and opting for the steep, sanity-questioning climbs to get you to the top before your buddies have even made it through the lift line. Pivot's engineers designed the Mach 4 SL Carbon Pro X01 Eagle Mountain Bike for those of us who are of the pedal-your-own-way persuasion, with a featherweight construction that's stature is anything but, offering stiff control and power that scales in at a whopping 300-grams below the previous Mach 429 SL. The new Mach 4 SL takes queues from the venerated Mach 4 and 429 SL, bringing the 4's lightweight and nimble attitude to the trail, plus the SL's progressive cross-country tuned setup for soaring to the front of the pack, gliding over slick root gardens, and charging forward to earn your spot as the KOM.

As we've seen throughout the bike industry, the Mach 4 SL takes on the popular trend of longer-slacker, but doesn't go overboard into Trail territory, pulling the head tube out to just 67.5-degrees (paired with a 120mm fork). Compared to the previous 429 SL's 69.3-degree head angle, the Mach 4 SL's head tube will lend the slacker angle to a bit more stability on descents, so you can take on steeper drops, and chunkier rock gardens without your bike feeling noodly under pressure. But this is a cross-country machine after all, and with pedaling being top priority, Pivot's engineers make things steeper in the hind-quarters, moving to a prime perch for power at 73-and-a-half degrees — ideal for speedy power transfers, and staying forward when you're out of the saddle and mashing up steeps.

Speaking of pedaling platform — if you're familiar with Pivot's Mach 4 and 429 SL, you may be looking at the rear triangle with a puzzled gaze, as its shock layout shifts tremendously from its predecessors. While the Mach 4 SL still carries on with the coveted DW-link, Pivot's designers opt for a new vertical shock layout. This allows a more compact frame design that uses less material in order to shed weight, and improved integration for Fox Live Valve, should you opt to upgrade the rear-end. This new shock layout offers 4-inches of supple suspension, ideal for gobbling up variable trail terrain, and quieting harsh chatter on the straightaways. Much like DW-link applications you've seen before, the vertical layout still offers phenomenal small-bump compliance, keeping your tires glued to the trail for traction control as you soar up climbs, and a plush mid-stroke to take up the impact when you thought you could turn those two rollers into a double, but ended up taking things a little too far, and landing in the flats.

While the new shock is undoubtedly the highlight of the 4 SL's linkage, it's worth noting that it also affords space for a full sized water bottle (even in size extra-small, or two on the extra-large frame), and creates clearance for improved stand-over height, enabling size extra-small to accommodate riders as small as four-foot-ten, with a stand-over even lower than the 27.5-inch Mach 4 of prior seasons.

Pivot employs the X01 Race build with a well balanced bushel of components, including SRAM's X01 Eagle drivetrain, and Shimano's XT brakes. This setup brings you a whopping 12-gears in the rear, so you've got just the gear you need for blasting past the competition on the straightaway, or offering your knees a bit of respite on a particularly grueling climb. The build is paired up with DT Swiss' M1700 hoops for quick-rolling power, and a 36-tooth star ratchet hub that offers near instant engagement to propel you with rocket ship levels of thrust. Fox's Factory suspension is utilized in both the fork and the shock to give you buttery-smooth Kashima-coated stanchions that soak up rowdy terrain and chatter, plus a remote for quick adjustments to your suspension while you hammer out the miles.

  • Soar to the front of the pack with Pivot's new XC rocket ship
  • Steep seat tube angle keeps you perched for the attack
  • Take on chunky terrain, and power back to the top with moderate head tube
  • Vertical shock layout improves stand-over height, water bottle clearance
  • New frame design sheds 300-grams over previous 429 SL
  • DT Swiss hoops with 36-tooth hubs engage nearly instantly
  • Lightweight carbon frame offers stiff control, and a 10-year warranty
  • SRAM X01 drivetrain for slick and precise shifts, endless gears
  • Item #PIV1WU1

Frame Material
carbon fiber
Rear Shock
Fox Factory DPS with remote
Rear Travel
Fox Factory Stepcast 34 with remote, 44mm offset
Front Travel
Pivot Precision Sealed Integrated Cartridge
SRAM X01 Eagle, 12 speed
Rear Derailleur
SRAM X01 Eagle, 12 speed
SRAM X01 Eagle DUB
Chainring Sizes
Bottom Bracket
Bottom Bracket Type
SRAM XG-1275
Cassette Range
10 - 50t
SRAM X01 Eagle
Brake Type
hydraulic disc
Shimano XT Centerlock, 160mm
Phoenix Team Low Rise Carbon
Handlebar Width
Phoenix Team Padloc
Phoenix Team XC/Trail
Stem Length
Phoenix WTB Team Volt
[extra-small] KS Lev Integra, 100mm, [small, medium, large] Fox Transfer, 125mm, [extra-large] Fox Transfer, 150mm
DT Swiss M1700
36t star ratchet
Front Axle
15 x 110mm Boost
Rear Axle
12 x 148mm Boost
Maxxis Ardent Race, TR, EXO
Tire Size
29 x 2.2in
not included
Recommended Use
Manufacturer Warranty
[frame] 10 years

Tech Specs

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What do you think about this product?


>Rating: 5

Light Weight Trail Bike

I've put it through the wringer

If you have never owned a Pivot, they pedal amazing well and this one is no different. The suspension is firm as should be expected but still absorbs the roots and rocks just fine. I was on the line between a small and medium. The small was a great choice since the wheelbase is similar to the Mach 4 Carbon it replaced. It handles the tight Ohio trails just fine. Don't box this bike into the race category though, it performs very well as a light weight trail bike. It's primary limitation is only the tires if you want to go into BRRAAP mode. FWIW, my build weight with pedals, Wahoo and Aspen tires is 25.06 lbs. EDventure

>Rating: 5

Dirt Fitness

I've used it once or twice and have initial impressions

I took this bike out for a big day here in the Wasatch Mountains of Salt Lake City, Utah. Kitted out, this bike matched not only my lycra attire but my inner ethos focused on speed, fitness, and fun. On the uphill, this bike pedaled better than any bike I have ridden. While a hardtail may be fast, the suspension on this bike makes it compliant on the uphill tracking over roots, bumps and rocks to provide a faster xc bike. At the top, I was curious how this bike would shred. Loads of flannel wearing, goggle donning enduro riders were shuttling the ride I had just ridden up and I pointed the bike down and just shot it. Like skiing powder in the winter, I felt like I was surfing through turns, in and out of pristine mountain single track. Launching of roots and rocks, the bike allowed finesse that a bigger traveled bike would have dampened. In short, I loved the way it rode uphill, but couldn't believe the way it was going down. For the riding I like to do, which is a combo of being fast and fun, this is the bike for me.

>Rating: 4


I've used it once or twice and have initial impressions

The past 24 months have been good for XC bikes. With the release of the new Santa Cruz Blur, Yeti SB100, Intense Sniper, Trek Topfuel, and Specialized Epic, it's become abundantly clear that the lycra-inclined among us are ready to throw down the gauntlet and face up to a gnarlier, rougher, more rad XC reality. The Mach 4SL's DW-link suspension is its party piece. This bike pedals better than the Blur or the SB100, and it impressed on the way down as well. Pivot's DW bikes truly do not exhibit brake jack! Compared to the Blur, the 4SL was slightly less predictable on rough descents, but it was extremely impressive in low-speed technical sections. I'd have to give the Blur/SB100 the advantage when it comes to descending, but the 4SL is definitely more efficient. Please reach out directly if you have any questions!