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is there a definitive guide/person people recommend?
Get Jobst Brandt's book*, it tells you what the maths is and why you're doing it.
Round down.
*By which I mean download the pirate PDF, since Jobst doesn't need the royalties where he is
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I always use at least two calculators (pro wheel builder and the Leonard one are my preference) and see how they compare.
Results can match closely on one calculation and vary quite a bit on another.
I tend to round up as I really don’t like spokes being too short but it depends, if the rim was particularly shallow I’d maybe round down.
@arup I notice you mentioning that you use a bit of stainless spoke for feeding nipples into sealed rims, do you never have any issues with the stainless spoke not being very magnetic?
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I always round down myself by 1.5mm or so and sometimes up to 2mm. I've written my own spoke calculator which I use for all my builds. The formulas that I've used in the app are from Spocalc.xls by Damon Rinard. Here's the link.
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gbj_tester
M_V
arup
@mustardbeak
I'm definitely finding spoke calcs the most confusing part of the process, is there a definitive guide/person people recommend?
If I'm getting 291.5mm on a spoke calculation, should I round up or down? It's a front wheel so same length on both sides.