The new carbon Mach 429SL from Pivot Cycles shaves half a pound off the previous frame to come in at a very respectable 5.3 pounds. Match that to 100 mm of potent dw-link controlled suspension and this venerable favorite becomes even more attractive. New hollow-core carbon technology from Pivot not only reduces weight but also increases overall stiffness.
The Mach 429SL is the second ever production bike released with full Shimano XTR Di2 integration (the Mach 4 Carbon was the first) with an easily accessible internal battery compartment near the bottom bracket as well as internal ports with dedicated caps for wires or traditional cables and housing. The frame is also RockShox Reverb stealth dropper post compatible or in our case, the cable and housing from the Fox DOSS dropper routes internally in the top tube.
Our bike is built up with a complete XTR Di2 group, including Race level brakes and wheels as well as Shimano’s Pro line Tharsis XC Flat Di2 specific stem and carbon handlebar with internal wire routing. By using these the wiring system is almost completely hidden in the frame and totally out of view at the cockpit.
The frame comes standard with a Fox Float Kashima Factory shock with Pivot’s simple to use sag indicator. It also has a 120 mm travel Fox 32 CTD Factory Kashima coated fork but the geometry is designed to work with a 100 mm travel fork as well. As shown, our bike weighs 25.15 pounds without pedals but depending on some specific parts could be built to less than 24 pounds.
With a head angle measuring in at 69.3 degrees, Pivot is utilizing a fairly common number for its cross-country specific Mach. That’s matched to 17.65-inch chainstays to keep the bike quick and nimble. So far its 100mm of rear travel has been highly impressive, often giving the illusion of having more travel at higher speeds. Climbing, the Mach is consistently active but excellent anti-squat from the dw-link design keeps the bike feeling fresh and spunky when putting power to the pedals on smooth sections without giving up compliancy and traction on technical climbs
The Mach 429 SL Carbon frameset retails for $2,999 and various complete bikes are offered. The Shimano XTR Di2 bike retails for $10,400 with a few slight differences from ours including Reynolds carbon wheels, a Pivot branded Phoenix Carbon seat post and handlebar, and Team stem. For first impressions of XTR Di2 click here and here.