Smoothest Riding. Most VersatileThe 800 Switchback® PRO-S is for crossover riders who want the ultimate in cornering and handling, and a sled that virtually eliminates stutter bumps. Featuring the Rider-Balanced AXYS® Chassis, 800 H.O. Cleanfire® Engine, and multiple comfort features, this snowmobile delivers Rider-Balanced™ Control, Unrivaled Acceleration, and Rider-Centric Comfort.Features may include: AXYS® Chassis The AXYS® chassis features 93% new parts, including a carbon-fiber overstructure and aluminum handlebars on SnowCheck Select or Limited Edition models and an aluminum overstructure on standard models. The chassis structure and design makes it possible to change the rider positioning, centralize vehicle mass, redesign the rear suspension, add more power, remove weight, and evolve the rider’s riding experience. In short, it is the key to delivering rider-balanced control, unrivaled acceleration, and rider-centric comfort.How did we get there? Polaris: Put the rider in the right location on the sled, centralized vehicle mass, optimized the suspension geometry to better control pitch.