Rotating Mass...Is it a Big Deal?  YES!  
1 pound of rotating mass is a performance improvement like removing 7 pounds of stationary mass!

SLP's exclusive patented design is the latest in braking technology. The WAVE design allows the lightest possible weight as well as the maximum cooling and more braking power than conventional rotors.

Ski-Doo Ultra-Lite Wave Brake Rotor Assembly

• Weight Savings:  1 lb., 8 oz.
• For all models with 27mm shaft.
  Will not fit X-Model Race Sleds, REV 550 Trail, 2005+ Mach Z or 1000 Summit REV
• SLP recommends the use of SLP #27-23 Brake Pads with the WAVE Rotors for best performance.