Bottom bracket length without knowing front chainline (fixed gear) I'm wondering if I can find the right bottom bracket axle (or spindle, whatever it's called) with knowing my crank model (Gipiemme Dual Sprint, Velobase says BB should be 113mm) and rear chainline (I think 47mm, I can measure exactly with caliper).

As far as I know I have to use Campagnolo BB's with Gipiemme cranks and I can only order them online from where I live. I don't want to have to send back, order another and on and on ;)
Presuming a replacement is necessary, and not a new build, can you remove the cranks and measure the the spindle length?  You can do it with the BB still installed if the caliper arms are 'deep' enough.  

While you are in there with calipers, its probably worth getting the BB Shell diameter and width too.

Another variation is the thread's hand orientation (left/ right).  I forget now side is the variable one.