Sea Otter 2011: Pivot Cycles M4X four-cross frame

Testing the waters with new Mach 4 variant

Pivot Cycles showed off a new four-cross/dual slalom variant of their popular Mach 4 at this year's Sea Otter Classic tentatively called M4X. Built for the company's factory racing team, Pivot may or may not bring the prototype into production depending on public response.

The special frame features 100mm of travel and a tapered head tube like on the standard Mach 4 but generally stouter construction throughout and a modified geometry, with a shorter rear end, lower-slung front triangle and slacker head tube angle.

ISCG tabs are integrated into the machined bottom bracket shell, there's a unique aluminum lower link on the dw-link suspension design – which has likely been retuned for a firmer feel to better suit bigger hits and faster speeds – and a 142x12mm rear end for extra stiffness. 

Also unique to the M4X is an ultra-burly replaceable derailleur hanger, post-mount rear brake tabs, twin upright braces on the rear triangle and a threaded bottom bracket shell. Pricing was unavailable on account of the bike's uncertain future and we don't have a claimed weight at the moment – though the M4X is almost certainly heavier than a standard Mach 4.

The pivot cycles m4x features iscg tabs machined right in with the rest of the bottom bracket shell: the pivot cycles m4x features iscg tabs machined right in with the rest of the bottom bracket shell

James Huang

Technical Editor, US
James started as a roadie in 1990 with his high school team but switched to dirt in 1994 and has enjoyed both ever since. Anything that comes through his hands is bound to be taken apart, and those hands still sometimes smell like fork oil even though he retired from shop life in 2007. He prefers manual over automatic, fizzy over still, and the right way over the easy way.
  • Discipline: Mountain, road, cyclocross
  • Preferred Terrain: Up in the Colorado high-country where the singletrack is still single, the dirt is still brown, and the aspens are in full bloom. Also, those perfect stretches of pavement where the road snakes across the mountainside like an artist's paintbrush.
  • Beer of Choice: Mexican Coke
  • Location: Boulder, Colorado, USA

Related Articles

Back to top