Hi, has anyone else foung that your rear cassette has worn excessivly quickly since changing to a double & bash set up? I fitted a sram 990 cassette, new front rings and chain about 300 ish miles ago 9total guess, but not many months back), and the smallest 3 gears of the cassette are worn out already. I assume this is because without the big chainring, i'm spending most time on the smallest rears. I'm not sure to be honest if its because of that, or just that sram cassettes wear a lot faster than XT ones!