Wheels Manufacturing BB30/PF30 Universal Shimano Crank Adapter Fspeed_9 Speed this gives us the following

this gives us the following benefits which wouldn’t be possible with a larger sprocket size or with a universal type design…

Hidden needle adapter & plastic valve adapter

skin-friendly textile chinstrap

replaceable pins nominally 2

including those found on Surly frames like the Steamroller and Karate Monkey

Wheels Manufacturing BB30/PF30 Universal Shimano Crank Adapter Fspeed_9 Speed this gives us the followingWheels Manufacturing BB30 PF30 Universal Shimano Crank Adapter Adapts PF30 PF30A and Cannondale BB30 73A bottom brackets for use with Hollowtech II cranksets kit includes 2 adapter shims and a 14 piece assortment of left and right side spacers Press Fit 30, and Press Fit 30a use the same 30mm ID bearings and 46mm OD Cups; the difference is that PF30a adds 5mm to the non driveside of the frame Simply tap the adapters into the 6806 bearing in the BB