Originally Posted by
old's'cool
Sixty Fiver, as a fellow Canadian I'm surprised at you!
We of all people should have our metric to Imperial conversions sorted out.
Last time I checked, 1"=25.4mm. Hence, 0.5mm = approximately 0.020" Since your conversion of 0.005" to 0.13mm is correct to two figures, I assume there was a glitch somewhere in your conversion 0.5mm to inches. Don't worry, it happens to the best of us.
Put it down to a lack of coffee.
.5mm is .01968503937 inches or .020 (rounded).
Getting a wheel to .5 mm is good enough for union work and many wheels won't get any better than that and some are not worth the effort.
I have a few wheel sets that were built to 0/0... and they are still running within a few thousandths of their original build and the biggest contributor to that has been very good quality machined rims with high build tolerances and high quality spokes and our special process for removing all build tension and wind up.