I had a serious bout of cog slipping with my last conversion and it resulted in 1 toasted hub. After getting a brand new wheelset and lockring I STILL had a couple incidents and finally took it to my LBS and physically watched them tighten everything down as hard as possible. But now Im on a brand new Pista and had a little cog slipping with that on my first ride. Took it back to the LBS and in the nicest way possible told them if this ever slips again and I end up crashing Im going to throwthis bike through your store window. Havent had any problems since then. I have to tackle some pretty tough hills in my daily adventures and the last thing I need is the lockring slipping off on a decline. So Ive invested in a handydandy LR tool and chainwhip.