I don't know a whole lot about gears other than they do make a difference in the kind of gas mileage I get on my car.
I like to drive a car that gets really good gas mileage, so I have a higher gear ratio than the sports car my son drives.
Fuel efficiency and reliability are more important to me than speed and acceleration. He likes the performance that he gets from a lower gear ratio.
My husband also has a motorcycle and I don't know how these gears compare to the gears on our cars. I have never driven a motorcycle, but know the ring gears on a motorcycle are just as important as any other vehicle.