Pivot Mach 4 Mountain Bike Frame $2,199.00
Down for whatever.
The Pivot Mach 4 Mountain Bike Frame is perhaps Pivot's most versatile machine. If you consider that you can use it as a full blown cross-country race bike this weekend and roll through hidden backcountry trails with a backpack and an attitude for adventure the next, you'll know what we mean. The key to its utility is the 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 makes it all possible because of its anti-squat characteristics. 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. 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.
The Mach 4 uses a tapered head tube. We love the tracking precision afforded by a fork with a tapered steerer, and this zero stack variant allows a lower total stack height and lower handlebar if you choose. This is a great benefit, especially on the smaller sizes.
The Pivot Mach 4 Mountain Bike Frame is available in six sizes from XX-Small to X-Large and in the colors Anodized Black, Anodized Blue, and White powdercoat. It has a low direct-mount and requires an E-type Shimano or Low direct SRAM front derailleur. You'll also need a 30.9mm seatpost. The tapered head tube requires a semi integrated (zero stack) tapered headset with 44mm top and 56mm lower cup diameters. Pivot recommends a 100mm fork with the Mach 4, but they say freely that you can run a 120mm fork on it if you're interested in slowing the steering a bit and having more squish up front on rocky trails. It has IS brake tabs and open dropouts for use with a 12x142 thru-axle (included).
US Pivot dealers are prohibited from shipping Pivot bicycles outside of the United States and US territories.