Weight classes advance in increments of ten pounds until you get to 155. Then they increase in increments of 15 pounds (170, 185), then 20 pounds to LHW. When you are the champion at a current weight class, it means you are the best fighter who can make that weight class. It's rather arbitrary. For example, if there were a 177 lb weight class, would Gastellum or Hendricks be the champ? Certainly possible. Would Cerrone be champ at 162? We make fun of these guys for missing weight and losing to elite fighters, but a big part of it is that they just have an unlucky natural weight (no, Hendricks did NOT look fat for this weigh-in). One way to cut down on the terrible weight cuts is to add two weight classes. Why not now? The UFC roster is huge, the sport is bigger than ever, and you have a couple of torch-bearers for the new classes. 155 165 (new) 175 (replacing 170) 185 195 (new) instead of 155 170 185 Hell, you could even set it up just to add one more weight class and it'd help 155 165 (new) 175 (replacing 170) 185 In MMA, 165 would be an AWESOME weight. Should be very entertaining, good combination of speed, power, and cardio. Right now, 170 is probably the most entertaining class but I think 165 would be even better. 175 would be great too.