Do a quick search to verify what I remember, but I think that with a smaller number inputted(tire size), the displayed speed goes down. so put a larger tire size in the gryphon and see what happens, Try to do it a couple percentage at a time and see how that changes.
Did you account for squish? usually a 3% reduction in tire size is calculated so subtract 3% if you havent and see how that works for ya.
Hope this helps.
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