These bottom brackets from KCNC are designed to adapt BB30 bottom brackets for use with common 24 mm spindle, 68 mm shell-compatible cranksets such as Shimano's Hollowtech II series and FSA's Gossamer crankset. Two extra plastic bearing caps are included with each adapter.
To properly tighten these threaded bearing cups, two Hollowtech II compatible tools will be required. KCNC recommends tightening the cups to 35 ft-lbs of torque. This design uses a compressible o-ring on the non-drive side cup to compensate for bottom bracket width discrepancies.