More power, lighter, better traction and racer-looks for 2007. These spring-only models continue the tradition of feature-laden mountain sleds, with lighter Challenger Lite tracks, taller bars and J-hooks. The 1000cc Highmark X is 15 pounds lighter, but still a hefty 534-539 pounds (151â€â€“162â€) while the Summit X is a paltry 468-478 pounds, depending on track length (still offered in 144â€, 151â€ and 162â€ lengths, all 16â€ wide). Combined with the awesome 800R engine, weâ€™re talking 3.1-3.2 pounds per HP. This is where the bulk of the action will be for 2007.