The Pivot Mach 6 is one of the first bikes we've looked at that checked every modern box. Low center of gravity, long top tube, short but not ridiculous chainstays, and 27. 5 inch wheels. Working backward, that means Pivot saw the Great Wheel Size Changeover for what it was and got to work on a fully new, fully modern design, rather than rushing something to market with a longer link on a 26 inch frame. The 155mm of travel is managed by the tried and true DW link design, with its famed anti squat nature and ability to isolate braking forces from the suspension. And, you don't have to read six pages on the Internet to figure out what it does it just works, and it works the same way it always has with progressive refinements, of course. The real benefit we see in the Mach 6 is its low bottom bracket height, which, when paired with its 27. 5 inch wheels, means the BB sits below the axles, like it would on a 29er. This means stability at speed, which is what a six inch bike should be.