There are quite a few options for fitting a 24mm Shimano crank in a BB30 bike frame. I chose the Wheels Manufacturing angular contact bottom bracket because of its ease of installation and perceived quality.
Wheels Manufacturing BB30 to Outboard Bottom Bracket with Angular Contact Bearings, Black, Shimano 24mm Spindle
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Wheels Manufacturing BB30 to Outboard Bottom Bracket with Ceramic Bearings, Black, Shimano 24mm Spindle
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Wheels Manufacturing BB30/PF30 Universal Adapter for Shimano Cranks, Black, 24mm
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