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Kit.M
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.