That depends on where you want to run the chainring. On a standard shimano double crankset on its standard/ recommended size bb, the inner ring is at 41, and the outer is at 46 mm. This means that with a standard 42mm-ish track hub, the inner ring position will be just about perfect, since 1 mm either way is inconsequential.

On the other hand, not everyone wants to run a single ring on the inner position. Among other advantages, the outer position looks a bit cleaner. So, if you get a bb spindle that's 3 mm shorter on the drive side, the outer ring position will now be around 43 mm---again, within 1 mm of 42 mm is close enough to perfect. As a bonus, moving the crank in means your q will be a few mm narrower, very slightly reducing your chance of a pedal strike.

The one issue that can arise from moving the outer ring position in to 42 mm is, the bike's designers may not have intended for the crank to come in that close and so parts of the crank may rub on the bike frame. You have to figure out for yourself whether this will be a problem with your own frame and crank.