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Discussion Starter #1
the track is 95x38. i will be running a kc 19turn motor with a darkside slider car. just looking for a great ballpark guess on the spur and pinion for this set-up.

thanks
 

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Discussion Starter #4
ok ok i should know

ok i know i should know this but i have never heard of roll-out. we just always used ratio's, when getting a gear set-up. can someone get me the spur and pinion teeth number so i can get close. the motor is a kc 19 turn.

thanks
 

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munchi said:
ok i know i should know this but i have never heard of roll-out. we just always used ratio's, when getting a gear set-up. can someone get me the spur and pinion teeth number so i can get close. the motor is a kc 19 turn.

thanks
Gearing depends on tire size when it comes to foam tire racing.
 

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Discussion Starter #6
roll-out

ok... how do you figure roll-out? but most of my tires are around 2.15 diameter.
 

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Roll out is how far the car will travel with one revolution of the motor. This takes into effect your tire size and gear ratio

diameter of tire x pi (3.141) divided by gear ratio= roll out.

having two axles with a 2 tooth difference (say 118 and a 120) will let you dial in when your tires wear down.
 

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Discussion Starter #8
thanks

hey wolfman. thanks soooo much for that info and the two apex cars. i talked to dan morgan and he is great. hope to do alot of business with him very soon.
 
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