The Ultimate Mountain Sled Take the Line That Sets You Apart The PRO-RMK® 163 is the lightest, strongest, most flickable deep snow sled on the market. The world's best mountain sled features the industry's best power-to-weight ratio to give the rider instantaneous lift and immediate response. Features may include: Instantaneous Lift The combination of the raised and lightweight AXYS® chassis, a powerful Polaris® engine, and the Polaris-exclusive track designs pop the PRO-RMK® 163 on top of the snow. Rider Balanced® Control The AXYS® platform features Rider Balanced® positioning that delivers ultimate control for the rider for precise, effortless sidehilling. Immediate Response The world's best mountain sled is built to be the lightest and most rigid, making it incredibly responsive to rider inputs. This allows you to change direction and maneuver confidently in all conditions. AXYS® Chassis The raised AXYS® chassis increase clearance and reduces drag to keep you on top of the snow. It is purpose-built for mountain riding and allows for improved sidehilling, faster and easier climbing, and instantaneous lift allowing the sled to pop onto the snow faster. The aluminum over structure is lightweight and durable for all types of riding. Taller spindles increase clearance to reduce drag. Liberty® Engine Choices for Every Rider Built to integrate seamlessly with the lightweight and agile Polaris® chassis, Liberty® engines feature class-leading power-to-weight ratios and set a new benchmark for ultimate performance with our complete line-up of powerful options. Rear Suspension The lightweight, rigid rear suspension design features revised geometry to control pitch. This improves weight transfer, delivering better control and a more compliant ride. The rigid suspension delivers power directly to the snow. Off-trail, riders will notice improved weight transfer while maintaining the approach angle. On-trail, riders will notice a more compliant and comfortable ride. The rear suspension features a rail design that helps lift the rear skid while driving it forward. Walker Evans® Shocks The PRO-RMK® 163 comes with premium Walker Evans® Piggyback Shocks or Monotube Shocks. The Walker Evans® Piggyback Shocks with compression adjusters and remote reservoirs offer the best performance across the broadest range of conditions. The Walker Evans® Monotube Impact-Extruded Shocks are the lightest weight shock option from Polaris® for those riders counting the ounces. The one-piece, simple design is lightweight yet durable. QuickDrive® Low Inertia Drive System The QuickDrive® System is designed to make the sled rev quicker for instantaneous lift and reduces rotational inertia by 21% for easier handling and flickability. Not simply a belt-drive, it's a complete lightweight drive system. AXYS® Body Panel Design The AXYS® PRO-RMK® features a compact body panel geometry and design that help give the sled the best lean angle in the industry allowing it to hold even the steepest sidehill lines. The PRO-RMK® does not "panel out" like other sled brands. The 800 PRO-RMK® 163 gives the rider instantaneous lift and immediate response - plus the "Proven Polaris® Benchmark" of the 800 Cleanfire® H.O. Engine that was developed in conjunction with the AXYS® platform to deliver ultimate responsiveness, performance, and quality. 800 Cleanfire® H.O. Engine PRO-RMK® React Suspension™ Shocks: Walker Evans® Monotube / Piggyback Shocks Track Options: 2.6" Series 6 / 3.0" Series 7 QuickDrive® Low Inertia Drive System