Lots of spoke stockers stock only even length spokes. So if we round up or down to the closest mm (I always round up unless it's really close to the shorter size) we could be almost 2mm out. I'd think 2mm is the max you'd want to go.flyingmachine said:Planning to build up a beater wheelset w/ some old parts(unused but vintage). Unfortunately, according to my friend who calculated the spoke lengths, the spokes I got are either 1 or 2 mm too long or too short. Is 1 or 2 mm that critical? tks!