Some Shimano BBs have a plastic cup. They actually work just fine for many miles, but stomping on a loose one will crack it. You either need a nice/new/affordable no-plastic replacement from Rivendell, or this is your excuse to buy a fancy schmantzy Phil. Because you can adjust chainline. Which is vital on a singlespeed. That's my story, and I'm sticking to it.. Joe "trust me..I know what I'm doing" Bernard Fairfield, CA.
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