ROTAX 850 E-TEC ENGINE: The most powerful 2-stroke engine in the industry. * It pumps out 10 more horsepower (165 hp) than its predecessor, but its responsiveness is what really shines. With the pDrive primary clutch, it’s 30% quicker responding than the 800R E-TEC giving you the instant control you demand. *Observed HP measured on internal dyno test in optimal conditions for 2-stroke engines. REV Gen4 PLATFORM: Key to the Summit’s agility is the extreme mass centralization of the 4th generation REV platform. The trademark pyramidal frame, die-cast aluminum front suspension module and heat exchanger design ensure it’s strong, yet lightweight. COOL AIR FLOW: Side panel venting improves airflow to drive components for cooler operations and optimal performance. PDRIVE CLUTCH: A major factor in the quickness of REV sleds is the pDrive clutch. Fast and friction-free dual rollers transfer torque in place of traditional sliding buttons on this 100% clutch. The oversize rollers with needle bearings, wide flyweights and shaft-on-shaft design emphasize smooth operation and long life. Ultra-responsive shifting, impressive RPM consistency and 2.8 lb./ 1.3 kg lighter than the TRA VII. TMOTION REAR SUSPENSION: The tMotion flexes laterally, reducing the effort to initiate a roll, due to a ball joint at the center hinge between the rear arm and drop link and split flat-tube front arms. Very progressive motion ratio makes the ride on trails even more comfortable. MOUNTAIN ERGONOMICS: We designed the new Summit to enable you to do more with less effort. The narrow body, beveled tunnel, tank, seat and handlebar controls are extremely compact and narrow for more room to move. And your legs will appreciate the flatter foot position. MOUNTAIN-SPECIFIC DESIGN: We advanced mountain sled design for easier and more predictable handling in all conditions. The narrow body panels, bottom pan, tunnel and running boards are designed for optimal interface with snow in mountain maneuvers. An open tunnel end eliminates drag. RAS 3 FRONT SUSPENSION: Similar geometry and design to the stable and precise RAS 2, optimized for the Gen4 REV platform with 1 in./25mm added suspension stroke and .7 lbs (3,2 kg) reduced weight vs. RAS 2.