This adaptor is a very simple solution to a potentially expensive problem. Now that BB30 frames are becoming more common, we're hearing quite often that riders want to fit a Shimano chainset. Either when building up a new bike or, replacing a chainset, BB30 compatable parts can be very expensive! Using this easy to fit adaptor will allow you to use your existing Shimano, or new slightly less expensive chainset on your BB30 frame. Including all fittings, spacers and even sealed cartridge bearings, this kit is the complete solution - no additional bottom bracket required.