Join Date: Apr 2004
Location: Hilo Town, East Hawai'i
Bikes: 1994 Trek 820, 2004 Fuji Absolute, 2005 Jamis Nova, 1977 Schwinn Scrambler 36/36
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One number is the length of the shell in your frame that the bottom bracket threads into, and the other number is the length from one end of the bottom bracket spindle to the other end. At least that's how it is for the square-taper BB's in mine. e.g. I have 68x113, where the BB fits into the 68mm BB tube in the frame, and its spindle is 113mm long from end-to-end.
-=- '05 Jamis Nova -=- '04 Fuji Absolute -=- '94 Trek 820 -=- '77 Schwinn Scrambler 36/36 -=-
Friends don't let friends use brifters.