Crank Advice

right, so the DA roads are an option really then?

according to sheldon brown a typical road double gives 41mm for the inner and 46mm for the outer. if track chainline is generally 42mm i would need a bb with a spindle 8mm shorter than that i would need with track cranks. what is the standard bb spindle length for track, or does it vary dependent on the track cranks used?

This is dependant on the hubs you are using.