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Old 05-06-2006, 09:49 PM   #1
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hi i just want to know how rollout works..and gearing... i just came from a club race and notice my t2 is just slower than them couple of guys use c027 motors just like me...and they just zoom on the straight away...

how those it works when you put a small pinion or larger pinion what will those works...

ex. i got a 116 64p spur..

and what does high no. of rollout do.

and what does smaller no of rollout do.?

just an additional info i run on a technical track with lots of turns and one straight
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Old 05-06-2006, 09:56 PM   #2
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GO TO www.gearchart.com that will do it for you.

for stock it should be like 25 or in that area.
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Old 05-06-2006, 10:23 PM   #3
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Rollout is how far the car travels for 1 revolution of the motor. To figure rollout, multiply your primary drive ratio (spur/pinion) by the internal ratio of the car. Then you have to divide the circumference of your tire by your final drive ratio (spur/pinion x internal ratio). for example, on my JRX-S I'm running a 34 tooth pinion with a 128 spur with CS-27 premounts.. The circumference of my tires is 7.85 inches..

7.85/((128/34)1.83)

3.76 x 1.83 = 6.88
7.85 / 6.88 = 1.14 or 29mm rollout.

With a CO27, you probably want about a 1.08 or 27.4mm rollout

Confused yet?

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Old 05-07-2006, 09:27 PM   #4
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thanx guys ....... .... for your help
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