I don't know. A mistake perhaps?
FYI: I took a look at adding a popup table to list speeds with different pinons, or spurs, whatever, and decided against it. Just adds a level of complexity I don't really want to deal with. More like tedium than complexity.
What I DO want to add is an alert of some kind which will tell the user if they are geared too high. There is a point in gearing where the motor is not spinning fast enough per mph for smooth low speed/take-off operation (around 1mph). Looking back, it seems I set my vehicles up for around 1000+ rpm per mph and everything runs fine. I'd like to know if there is a good rule of thumb regarding this, but would also depend on motor size of course.
On a similar vein, GriffinRU had provided some input on this topic a while back with regards to the minimum motor rpm needed for adequate back-EMF pulses from the motor. The idea was dropped because my simple mind could not grasp what he was talking about, but I think it would be worthwhile to have this kind of data available.