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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
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