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http://www.ebikes.ca/tools/spoke-calc.html
check the 'paired holes' option and measure the distance between them.
I don't know how reliable this calculator is however so don't blame me if it's wrong!
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Any advice?
Draw the 3 polygons (two irregular decagons for the hub and an icosagon for the spoke holes in the rim) in Sketchup, then draw lines joining the relevant points and see how long they are. You can also do it with trigonometry, since you know the positions in a 3-dimensional Cartesian space of the two ends of the spoke. Jobst's book has the formulae and corrections needed for real spokes, you'll obviously need to adapt them slightly to allow for the spoke holes not being equispaced on their pcd.
fredtc
gbj_tester
@Kit.M
I bought some tange hubs and hplusson rims (ERD 557) and I was hoping to lace them up with some dt Swiss bladed spokes In a two cross pattern, but I can't find any way of calculating the spoke sizes (due to the hub's irregular spoke hole pattern) the only way I could see is just trial and error with some oversized spokes, but knowing me I'd screw that up far too easily. Any advice?
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