Bill Dennis wrote:
> Can someone explain the terms "shorter" and "taller" that keep getting
> mentioned in relation to gear ratios? They seem to be the opposite of
> what I'd intuitively think (i.e., 3.25 is "taller" than 4.25--which is
> opposite of how the numbers would seem to indicate). Is it because the
> driving gear is "taller" in relation to the driven gear at 3.25?
"Taller" simply means a "higher gear" if you were thinking of it in
terms of a gearshift on a transmission. This means less torque
multiplication, and higher travel speed for a given input RPM. It's one
of those terms that perhaps doesn't make logical linguistic sense, but
feels like the right word when you get a sense for it.
Assuming we're talking about rear end differentials... since 3.25
driveshaft revolutions per wheel revolution is effectively a "higher
gear" than 4.25-to-1, folks frequently call it a "taller" ratio. Torque
is only multiplied by 3.25 instead of 4.25 (less torque), and wheel
speed is not reduced as much (and is therefore faster) for the same
motor (or transmission output) RPM.
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