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lincpimp · 07.13.2009, 05:14 PM

Also keep in mind that having more teeth on the pinion will help with how well the spur and pinion mesh.

Pretend you have the desire to run a 3:1 ratio, you can accomplish that with a 10t pinion and a 30t spur, but a 20t pinion and a 60t spur will run smoother, as the teeth angles are better on the 20t and more teeth are in contact with each other at any one point.

So a larger pinion with the same spur will increase your top speed, but place more load on the motor, esc, and battery.

A smaller pinion will provide faster acceleration, but less top speed. You can gear a system too low, and the motor temps will be high as the motor is revving too fast with not enough load. Not usually a problem, but say you are trying to run an 1/8 buggy with a mmm/2200 combo on 6s lipo and it is geared for 20mph... that will cause motor heat issues.

The opposite applies with spurs, smaller spur = higher top speed, larger spur = lower top speed.

	(#6)
lincpimp Check out my huge box! Offline Posts: 11,935 Join Date: Aug 2007 Location: Slidell, LA	07.13.2009, 05:14 PM Also keep in mind that having more teeth on the pinion will help with how well the spur and pinion mesh. Pretend you have the desire to run a 3:1 ratio, you can accomplish that with a 10t pinion and a 30t spur, but a 20t pinion and a 60t spur will run smoother, as the teeth angles are better on the 20t and more teeth are in contact with each other at any one point. So a larger pinion with the same spur will increase your top speed, but place more load on the motor, esc, and battery. A smaller pinion will provide faster acceleration, but less top speed. You can gear a system too low, and the motor temps will be high as the motor is revving too fast with not enough load. Not usually a problem, but say you are trying to run an 1/8 buggy with a mmm/2200 combo on 6s lipo and it is geared for 20mph... that will cause motor heat issues. The opposite applies with spurs, smaller spur = higher top speed, larger spur = lower top speed. Alot of Savage parts for sale!!!