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Old 02-27-2008, 07:17 PM   #1
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Default 12th scale gearing need help ASAP!

its my first raceon saturday and i want my car to be fast. im geared 22/75 rite now (27t) im wanting to know what you guys run and how punchy and fast it is.
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Old 02-27-2008, 07:47 PM   #2
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That gearing puts you somewhere around 1.60 inch rollout. Depending on the type of track, that sounds a little low. A Monster Stock seems to like 1.65 to 1.75, and a CO27 seems to like 1.75 to 1.85 inch rollouts.
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Old 02-27-2008, 07:57 PM   #3
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That gearing puts you somewhere around 1.60 inch rollout. Depending on the type of track, that sounds a little low. A Monster Stock seems to like 1.65 to 1.75, and a CO27 seems to like 1.75 to 1.85 inch rollouts.
+1...those rollouts are pretty close to what we run. 40x80 carpet track.
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Old 02-27-2008, 08:22 PM   #4
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what's rollout? (im new 2 onroad)
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Old 02-27-2008, 08:33 PM   #5
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what's rollout? (im new 2 onroad)
Rollout is the distance the tires will move the car for 1 revolution of the motor. The formula takes into account Tire size, spur/pinion, and transmission ratio (this case 1:1)

As with most algebra there are a few correct variations depending on the known variables. I use the following plugged into a spread sheet

(pinion*tire Dia*Pi)
spur gear

Measure tire Dia in units desired for rollout...ie. inches or mm
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