If this helps any, I am taking my x-fire 6 to Tog in Feb, I have extended it to a 144" with 2" Challenger Track. I did some asking around between dealer & those whom have been there & was told that 60 gram weights for 9,000 & up. The M6 & Cross 6 are basically the same sled. I was also told, no need for helix change, but if you want to tweek it for Max, get the helix.
Cuz, Ezra or anyone else whom might have a good idea on this thought for clutching weight, in light of the fact that I have gone from 136" to 144" & the M6 is a 141", do you think I should consider 58 gram weights due to the extra rotating mass, or is that splitting hairs? I don't really need to be making "high marks", then again, with the 6, probably just look dumb trying, I just want to be sure I am going with the right stuff.-Mezz