I bought several bottom bracket spindles on Ebay. I know that the 68 or 70 marking indicates an English or Italian BB shell and that SS is seen on the ones for two chain wheels. Can someone provide more detail about the proper application for the spindles with the following markings? There are no numbers indicating rear axle spacing (e.g. 120).
68-SS X3-M
68-SS
70-SP
70-SPc
David Bean
Arlington, MA