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Old 01-07-2010, 05:44 AM   #1
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Default Help with Gear Ratios?

Can someone explain gear ratios? I have a TC5 looking to get started with.
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TC5 FT / Spektrum DX3-S / Mamba Max Pro ESC 5700kv
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Old 01-07-2010, 09:13 AM   #2
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gearchart.com is useful, mute your audio before using it though.

Excel is a powerful tool for figuring gearing.

For what you have listed, tc5/mamba 5700/assuming rubber tires, I would start at 6.5 FDR.

FDR = spur/pinion * transmission ratio.

Be prepared to go higher/lower with pinions based on heat/speed needs.
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Old 01-07-2010, 09:26 AM   #3
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So to help you out a little more the TC5 has 2.0 diff ratio so say you running a 120t spur (64p gears) and a 37 pinion. You'll take 120 divided by 37 (spur/pinion) multiply that number by your diff ratio (2.0) and it will give you your FDR (final drive ratio) which in that case would be 6.49
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Old 01-07-2010, 10:27 AM   #4
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Originally Posted by D3878 View Post
Can someone explain gear ratios? I have a TC5 looking to get started with.
Very good reading. Enjoy.
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