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wes000 said:
I just got mt cross-check frame this week and want to put a "road triple" crank on it. Am I correct in thinking I need a 68x118 bottom bracket?
The first number you mention refers to the bottom bracket shell size, so yes, 68mm. The second number is the spindle length and, as roadiegonebad mentioned, depends entirely on the crank (which therefore determines your chainline). Determine what spindle length your cranks recommend (i.e. contact manufacturer, look up online, etc) and buy the appropriate bottom bracket.
 
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