Who follows the 1" per rev. gearing rule (rollout ratio)?

[_paralyzed_]

most of us use a much simpler rule and leave the math alone. we use BrianG's speed calc and for monster trucks never gear for much more than 40mph. Temperature will tell the tale from there whether or not you can gear up or have to gear down.

everything you state is correct and if you are a stickler for details go ahead and use it, but you're thinking too deeply into it IMO, it's not rocket surgery!