The only complaint we have with the 175 is the track and the stock skis sometimes don't agree on what direction the sled is going. The track can push the skis at times, and other times the deep keels on the skis will catch and the sled will turn quickly.
Technical Specs:
-Shortened riser on Summit X by 1-inch
-175 tunnel is 5.25 inches longer than 165 tunnel.
-Rear upper torque arm mount is 5 inches further back on 175. The rear shock is longer and the control rods are longer. Same rear scissor arm as 165.