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RC Gear Ratio

Old 09-11-2022, 11:40 AM
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Default RC Gear Ratio

New Member,
I am building a custom RC car using a Redcat Caldera xb 10e chassis. All electronics are brand new.
Brushless motor and ESC (4370KV).
I am using a metal 17T pinion (from a wltoys 12428) but now I am trying to figure out what spur gear to use. Would a 64T spur gear work fine?
I think the gear ratio would be 3.8...is that too high for the motor?
My goal is speed here but I don't want to kill my motor ?

Much appreciated!

Last edited by slim_seven96; 09-11-2022 at 11:46 AM.
Old 09-11-2022, 03:59 PM
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3.8:1 is only the ratio of the spur/pinion gear.
Rollout Ratio Calc... HERE





Old 09-11-2022, 04:18 PM
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Picture is from the info I filled in Speed Calculator for other Redcat Caldera 10E platform. I just used buggy tire size.
Speed Calculator... HERE
To figure out the internal gear ratio you need diff ring gear tooth count, and diff input pinion gear tooth count.


Last edited by RustyUs; 09-11-2022 at 04:34 PM.

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