A childhood friend of mine fights at 170 in the UFC. He naturally weighs 190-195. He cuts down to about 177-180 in training. Right before the weigh-in he dehydrates down to 170, and by fight time he said he is back to 180-182 range.Honestly I don't follow all this much so from what I read I thought the guy normally fought at 170. If he normally fights at 155 then yea he probably sits around 175. Cool read on how these guys manipulate their water weight for anyone interested....
http://fourhourworkweek.com/2013/05/06/how-to-cut-weight-ufc/