After relocating the skid back 3.5" and installing a 128" ripsaw. We rode 188 miles on Sat. Riding impressions are good, Smoother than the 121" and more nimble than the 136". We were all three switching from one machine to another. All are convinced the 121 has more ski pressure, quicker turning. The 136 pushes through the corners, and the 128 is somewhere in the middle. I did set the FRA in the softest position, the ride was great especially on the small stutter bumps. The trails did not have any large mogals at all. While on the two tracks the 128 did just as well as the 136 in the fresh 12" snow pack. I should also say the 121" ran the same. Note,, not enough deep snow to do an accurate comparision. Take off, the 121 still carries the ski's the furthest, but the main differance was rider, not actually machine. Off trail ditch banging the 136" Viper is still the smoothest, but not the most nimble. The 121" SXR still jumps the best. Next ride, I will be adjusting suspension more to dial it in. Overall I am very happy with the new track/size. Al