I only run .125's. I will tell you why. First off, I jump but not that huge. That is not the main reason. I was running down the canal at glamis two seasons ago, and hit a big rock. It made a taco out of my .125, but it didn't bend the axle, carrier, swingarm or throw me off, which is good cause I was doing about 50. The rim was trash, but a new rim is $50. I think a .190 rim would have still bent, but some of that impact would have been transfered to the bike and me. I still rode it back to camp, and bought a new wheel from Sweet Marie. No biggie. Think about it. I would much rather replace a rim than an axle, swingarm, or even worse, get pitched off because the rim didn't move. When that happens, that energy has to go somewhere. I have been running .125 forever, with only 1 bent rim, and I ride hard.