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A potential time-saver is this multi-adjustable Wheelrite tire and wheel simulator from Percy's High Performance (www.percyshp.com). You mount it on your hub and use its adjustability to experiment with various rim diameters, widths, and backspacings. The wire can be set to approximate tire profile. Then (at normal ride height) you rotate the hub and see if there are any clearance issues-pretty handy for around $100.