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I cant remember the build you are doing but with lasers I always round down because they do "stretch". After stress relieving there is quite a big tension drop and if you round up by 0.2mm you can end up running out of thread and get wind up which is simply a pain. I have learnt how much you can round down and up to 1.5mm with laser generally causes no problems. Also laser come in odd mm lengths only. Even with sapim race spokes I tend to round down as rounding up can causing dishing issues unless I am using black race spokes then I sometimes have to round up as they come in 2mm increments also.
Thanks for that - I've only just seen your reply - I've another question (if you don't mind)
Pumping the numbers in to the spoke calcs, I get
Sapim; F 291, R NDS 291, R DS 289
DT Swiss; F 290, R NDS 290, R DS 288
Whereas your spoke lengths are a bit shorter; F 289, R NDS 289 , R DS 288
Is that because the Laser spokes stretch more, being 1.5mm?
thanks
Steve