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just to let you know, a 17x10 wheel is not 254mm wide so centerline is not 127mm.
you need overall width for centerline and offset measuring, which in the case of a 10" wheel will probably be 11".
and there's no reason to convert to mm until after you subtract centerline from backspace, which would give you the offset. it's pointless to convert backspace, overall width and centerline to mm since most people here are in the US and use inches to measure unless they are just trying to be jdm.
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