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You’re finding this hard because spoke length calcs calculate spoke length based on hub & rim dimensions, you want a rim erd calculator that gives erd according to your hub and spoke dimensions. Which doesn’t exist.
Try entering various erd measurements til you get one that shows @3x ~290mm or @4x ~294mm. Then find a rim that is that erd or near, a bit over that would be fine as you’ve already aimed at a -2mm rounded-down spoke length.
Are those^ your actual hub measurements? (though we can’t fully see the number in left flange>centre box) someone very bored, maybe me at about 3pm this afternoon say, might try to help you find your rim.
Skülly
I started a wheel-building project a few years ago but it went tits up and has been sitting gathering dust for ages and lockdown seems a sensible time to start... I have a hub (Sturmey Archer S2C kick shift 36 spoke) and a range of different spoke lengths (have about 40 spokes in either 292mm and 296mm), and want to find a rim to marry the two together.
I've spent the past few hours on wheel building calculators, my brain is fried and I'm no closer to figuring it out... I have hub measurements (and spoke sizes), but when I try to calculate this with the type of rim I might want (something like Mavic Open Sport), the spoke required are too long with 4X or too short with 3X. Any suggestions? Any help greatly appreciated!