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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.

Internal Gear Ratio - IGR íV Internal Drive Ratio íV Reduction Ratio íV Transmission Ratio --

This is a fixed ratio between the drive gears of a model, and is basically determined by dividing the number of teeth on the larger diff or tranny gear (or pulley) by the number of teeth on the smaller diff or tranny gear (or pulley) - LARGER GEAR / SMALLER GEAR. This ratio is expressed like: 3.6:1 (as an example), and can be multiplied by the primary gear ratio (PGR) to determine the final drive ratio (FDR). Determining the IGR (Internal Gear Ratio) is different depending on the model:
- 3 Gear Tranny (2WD Trucks & Buggies) --BOTTOM (DIFF) GEAR / TOP (INPUT) GEAR. Divide the number of teeth on the larger bottom gear (diff or output) in the tranny by the number of teeth on the smaller top gear (input). Don't bother with the center (idle)
- Belt Drive --DIFF PULLEY / LAYSHAFT PULLEY. Divide the number of teeth on the larger diff pulley by the number of teeth on the smaller layshaft pulley. EXAMPLE: A belt drive model has diff pulley with 50 teeth and a layshaft pulley with 21 teeth - 50 /
- Shaft Drive --DIFF (RING) GEAR / OUTPUT (SHAFT) GEAR. Divide the number of teeth on the larger diff (ring) gear by the number of teeth on the smaller output (shaft) gear. Don't bother with the spider or planetary gears). EXAMPLE: The diff on a shaft dr
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