Demolition Anorexia....
Nothing really..
The whole hub sucks (bearings, driver, ratchet ring, integrated o-ring, everything).
The hub WILL die if you run pegs. This review is late but I ran one over a year ago temporarily and it was the worst EVER. I'd say as bad as the Kink Viridian front hub.. Bearing-wise, the bearings all suck and the driver blows out along with it no matter how much you tune up the bearings or replace them. The reverse-threaded axle is good for grinds but it confuses the crap outta me sometimes.