But positioning matters a lot too, depending on where the motors are relative to the wheels. Similar to this:
What’s an inch? In vehicle engineering, there is metric, and there is metric. Convert FUB to metric. I think it’s not. But it’s not solely based on clearance, it’s also based on how far from the wheels. See this
Also motors that are behind wheels seem to catch more debris than motors that are before wheels, in the direction of the forward roll.