Aren't the the same as a BB lock ring? The "old" loose ball type.sandmangts said:Remember the old shimano fc-m952 xtr cranks? They required a lock ring to hold the chainring to the crank arm. I desparatly need 3 of those lockrings. I have 3 brand new cranks and chainring sets that I can't use without it. I can't find them anywhere. Any help is greatly appreciated.