@BillGordon this part of my post was on topic (and true)
https://i.ibb.co/tc8cXSB/baaaf110e9988b1063889b36ad7af891961c61c2.jpg
^regardless of your tire size and kv, if you look at the no load ground speed values on this chart, and set your gear ratio accordingly (@ 42v), to a very close approximation you’ll get the same performance. so, for example, if you set your gear ratio such that your no load ground speed is 62.2mph, your top speed on flat ground with 60a battery current limit per motor will be approximately 57mph.