Three different asymmetric bottom bracket standards share enough geometry that one adapter kit handles all of them. BBRight, Cannondale's BB30a, and Cannondale's PF30a all use offset shell designs with 30mm bearings, which means a single set of Delrin adapters from Wheels Manufacturing converts any of these frames to accept Shimano's 24mm HollowTech II cranksets. If you're running one of these frames and want to use Shimano cranks—whether for parts commonality, shifting integration, or just preference—this adapter bridges the spindle diameter gap without requiring a new bottom bracket.

The adapters press into the inner race of the 6806 bearings already installed in your frame, reducing the bearing's 30mm inner diameter to match Shimano's 24mm spindle. Wheels Manufacturing machines these from engineering-grade Delrin, which maintains dimensional stability under pedaling loads while providing a low-friction interface against the spinning crankset spindle. The material also isolates minor vibrations that would otherwise transfer between the spindle and bearing races, which can help quiet drivetrain noise in some setups.

Asymmetric bottom bracket standards shift the shell position toward the non-drive side, which affects chainline compared to symmetric designs like standard BB30. The kit includes a comprehensive spacer assortment—four 0.5mm spindle spacers, four 1.0mm spindle spacers, two 1.0mm spacers with 30mm inner diameter, and one 2.5mm spacer with 30mm inner diameter—to dial in chainline position and eliminate lateral play. Different frame and crankset combinations require different spacer configurations, so having multiple thickness options in the kit means you can fine-tune the setup rather than accepting whatever the default configuration delivers.... Read More