The M-10 is a trail skid BUT back in '96 Tony Hikonen (sp?) had it in his '96 MXZ 440 sno x sled SO they must have some sort of a way to "beef" them up to take the big stuff. I had one in my '96 XCR 600 but the motor blew b4 I could really ride it and I sold the sled soon after the boom. Seemed ok from what I could tell. Other here will give you more info though.
The M-10 and XTRA-12 are similar in some ways. The XTRA-12 does not have the rising rate in the bottom of the travel--it is falling rate the whole way. It seems that the XTRA-12 is "less coupled" than the M-10, also. The M-10 is simpler, therefore probably easier to tune.
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