I always use 192, on the outside and inside. I have always used all single backers, and the only tear outs that have ever occured was when i let a friend borrow my sled, came back with two tear outs and a torn up heat exchanger. Tears obviously depend mostly on how it is ridden (spinning the track, especially from a dead stop when racing, you are slower when spinning anyway than if you ease on it without spinning), and the types of conditions you ride in. I have 5,600 miles on 192 woody's in my '01 SX 700R, and none are missing, bent, or broken, and no tear outs. This same sled is also on the FACTORY set of hyfax, no $hit. I will be studding the srx this weekend with 192 Roetin Hornets, heard good things about them from many sources. Will be using a single/double pattern, with half of tehe studs in doubles (48 backers) and half in singles (96 backers), including the outside belts. If you like to spin your track like half the morons out there across roads and coming out of every corner, i wouldn't recommend studding the outside belts, but i have always had good luck and will continue to stud them.