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How to match ratio of 48P to new 32P setup

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Old 07-02-2014, 08:30 AM
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DieHarder
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Default How to match ratio of 48P to new 32P setup

I am going to 32P and I'm going to use a 60T spur. I want my car to go the same speed that it used to. My current setup is 87/23 48P. What tooth pinion should I use?

My logic tells me to use this calculator: http://scriptasylum.com/rc_speed/gear_calc.html Using the "Distance between shafts" calculator, I would need a 12T pinion to match my current shaft distance.

Is this correct thinking?
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Old 07-04-2014, 07:21 AM
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I'd say you're certainly in the ballpark, maybe within the diamond. I was going to suggest using the diameter of the gears to match up the ratio.
What gears are you using, Nate? Did you have to make any mods?
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Old 07-06-2014, 05:12 PM
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I don't have the spur yet, but as far as I know I don't need to make any mods except maybe to my gear cover.

Current gears are:

Robinson Racing 87T 48P Spur - http://www.amain.com/product_info.ph...-Spur-Gear-87T

Robinson Racing 23T 48P Pinion - http://www.amain.com/product_info.ph...inion-Gear-23T
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Old 07-07-2014, 11:38 AM
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If you want the same gear ratio you're using the wrong calculator. Using the "distance between shafts" calculator just tells you the distance between the shafts with a particular set of gears, it does not tell you the ratio. Your 23/87 combo has a ratio of 3.78:1 while the 12/60 is 5:1 so your top speed is going to be different. A 16/60 combo gets you a ratio of 3.75:1 which is as close as you are going to get to your existing 3.78:1 ratio. Now if you want to make sure this combination will fit you can enter it into the calculator to find the distance between the shafts with 16/60 and make sure you can achieve that distance between the shafts in your vehicle.

Last edited by Maj_Overdrive; 07-07-2014 at 11:42 AM.
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Old 07-07-2014, 01:07 PM
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Silly me, I missed that whole simple concept! Thanks man! I will get the 16T then and maybe a couple others to change it up for different types of running. Not sure why I didn't think of that simple formula...
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