Originally Posted by
Andrew R Stewart
I forget the Fisher BB shell ID or how that compares to the BB30 shell ID. One aspect I believe I see is that this adaptor depends of the bearing preload to hold the adaptors in the shell, unless the adaptors are also a press fit into the shell. Interesting the listing has a reference to tolerances "2. Please allow slight manual measurement deviation for the data." that makes me wonder. That and the need for O rings to insure contact. Andy
The crank interface is square-taper. That means your Fisher has a BSA threaded BB shell. The most straightforward and reliable upgrade path would be to use the BSA-threaded outboard bearings that are appropriate for the crankset you choose. In other words, upgrade around the crank, not some bearings you happened to find. Hollowtech II for Shimano, GXP for SRAM and Raceface, or FSA for FSA. Owners of bikes with press-fit bottom brackets covet your threaded BB shell. Take advantage of that.