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New to the RC Hobbies? What does buggy, bulkhead, nitro mean in radio control car hobbies? Check out the glossary for remote control cars below.

Primary Gear Ratio - PGR --

A ratio found by dividing the number of teeth on the spur gear by the number of teeth on the pinion / clutch bell (72T spur / 25T pinion - 72 / 25 = 2.9:1 PGR). This ratio can be multiplied by the internal gear ratio (IGR) to find the final drive ratio (FDR). Note that the primary drive ratio can easily be altered by exchanging the spur or pinion / clutch bell.
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