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I'd go 193. According to the guys on
the TGR boards, the Mojo 90 rides short. And in my experience, the 180
Concept rides like a longer ski. I'm 6'4" and 195 lbs, and the Concept
is the only all-mountain ski that's worked well for me in a shorter length
You're pretty much exactly my size. I'd go 193, but I also ride 186 pollards. So you'll be okay with either. If it's your only ski, go 193, if you have the potential to have one long and one 185ish ski, then you might consider 186. But they both have their advantages.