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Pivot Mach 4/Shimano XT/SLX Complete Bike $0.00
At home on the cross-country race course or straightening backcountry singletrack, the Pivot Mach 4/Shimano XT/SLX Complete Bike is versatile because of its 100mm (4") dw-link rear suspension. The Mach 4 is a super-efficient race machine because it pedals well without inducing strange or wasted motion in the rear suspension. At the same time, it has deceptively plush travel that just makes it a fun bike to ride. Though these characteristics might seem to be mutually exclusive, the dw-link suspension is what makes it possible.
The reason for the all-conquering suspension is because of the anti-squat characteristics of the dw-link system. By virtue of Newton's Third Law of Motion, when something accelerates, its mass is transferred rearward. The dw-link counteracts this transfer to minimize your impact on the rear suspension. This is why Pivot is able to get such a lightly damped tune on the 7.25" x 1.75" Kashima Coated RP23 rear shock from Fox. With the dw-link controlling unwanted suspension squat, the lightly damped shock can respond with ultra-sensitivity to the demands of the trail. The Fox F120 RL Front Fork is a nice match for the rear shock. It is air sprung and offers rebound damping adjustments as well as a lockout. As a result, the Mach 4 delivers a comfortable ride and awesome climbing traction. It floats over rocks, roots and ruts, yet it still remains firm while hammering out of the saddle. In short, the Mach 4 adapts to virtually any situation you throw it in.
The great rear suspension would be nothing without being hung on a flex-free structure. Pivot builds the Mach 4 frame from hydroformed 6000 series aluminum tubing and 3D hollow aluminum forgings. The production processes for these raw materials both help to align and strengthen the grain structure of the alloy. The result for the Mach 4 is that it's light enough to build a complete bike at 22 pounds or so, yet the front and rear triangles are unyielding to the stresses from the trail. This gives you stability and precision enough to inspire the confidence you need to attack the climbs and bomb the descents.
There are a few key details that emphasize the efforts towards optimizing frame stiffness. One of the easiest to see is the BB92 pressfit style bottom bracket. The extra width in the shell does two things -- 1) It allows the frame designers to spread the forged lower seat tube yoke and increase the width of the lower dw-link, increasing stiffness and resistance to torsional flex in the link. All this comes without sacrificing front derailleur functionality. 2) It also provides better support for the bottom bracket bearings. Speaking of sealed cartridge bearings, the forged and CNC machined aluminum lower link contains eight of them -- two at each corner. This increases the durability of this workhorse component, stretches service life, and optimizes suspension function. The upper link is made of carbon fiber for strength and light weight, and since it sees less stress than its lower counterpart, Pivot relies on four bearings here to do the job of keeping the suspension operating smoothly. And to keep weight to a minimum, the pivot axles are all made from 7075 aluminum.
Since the Mach 4 has such a smart design, it would be a mistake to pollute it with an ill-conceived build kit. We have it here with parts from Shimano's XT and SLX groups. SLX gets the nod for the cranks, shifters, and front derailleur. An XT rear derailleur handles shifting duties out back. You'll get rolling on Sun Ringlé Charger Comp wheels and Kenda Slant 6/Nevegal tires, and Magura MT2 brakes get you stopped. FSA supplies the Comet Alloy Handlebar, OS-150 Stem, and XC225 Seatpost. Phoenix Lock-on Grips and a WTB Rocket V Sport Saddle top it all off.
The Pivot Mach 4/Shimano XT/SLX Complete Bike is available in anodized Black or White powdercoat. It comes in six sizes from XX-Small to X-Large. The Fox front fork uses a 15QR thru-axle for steering stability.