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Old 04-29-2003, 12:44 PM   #1
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Default Needing help in sortin gear ratio of 6!

I have a gearing ratio of 7.8 at moment but have been told by my track racers that i need to have a ratio of around 6. I have been given a chart with my car. Can u help me pick the right spur and pinion.

Chart is included

Thanks
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Old 04-29-2003, 01:24 PM   #2
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try this site.
http://rcracing.com/Page.cfm?InfoID=1100
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Old 04-30-2003, 08:58 AM   #3
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What you've been given there is a gear compatability chart (i.e. what gears will actually a fit), rather than a gear ratio chart.

Your TC comes with a 78 spur, right? the other figure you need to know is the internal ratio of 2.2:1

So, from the gear ratio formula (which I'm sure someone has posted for you before)....

6 = (78 spur/? pinion)x2.2

or ? pinion = (78x2.2)/6 = 28.6

So a 28 or 29 pinion will give roughly the ratio you want.
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