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This comes up a lot, so here's a comparison of the 14" SSII/III wheels vs. the 15". Note the much wider drop in the rim center portion to mate up with the center disk, which is the same diameter for both wheel sizes (yeah, I realize one is bolt-in and one is snap-in - that's irrelevant as far as this comparison is concerned). This does make it very easy to spot a 14" vs 15" wheel at a swap meet.