Originally Posted by
unworthy1
again: round down and more than just the fractional difference: I've found most of the on-line calculators I've used are off by at least 1mm too long, and often by 2-3mm.
AFAIK most spoke calculators don't compensate for spoke stretch. If you use thin spokes, e.g. DT Revolution spokes (2.0/1.5/2.0mm), the stretch can be quite significant.
The spoke calculator on DT-Swiss' site does compensate for stretch for their own types of spokes, and also for different nipple lengths (if you use DT's nipples). It also rounds off to 1mm increments:
http://www.dtswiss.com/spokescalc/we...px?language=en
It's worth trying and comparing to the results from other spoke calculators.