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Thread: 21/50 or 23/55

  1. #1
    RC poster
    Join Date
    Aug 2019
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    8

    21/50 or 23/55

    Hi I need to gear down, does it matter if I do 21/50 or 23/55, they work out to pretty much the same ratio but just curious if the large spur make any difference? More torque, lower rpm or something like that

  2. #2
    RC Qualifier
    Join Date
    Dec 2016
    Location
    N Dakota USA
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    476
    Quote Originally Posted by Nic112 View Post
    Hi I need to gear down, does it matter if I do 21/50 or 23/55, they work out to pretty much the same ratio but just curious if the large spur make any difference? More torque, lower rpm or something like that
    All other things being equal they should be the same. Which you choose might be determined by whether you the option to go up or down further in the future.
    The 55 will allow you gear further down is you choose to later .

  3. #3
    RC Racer
    Join Date
    Jan 2019
    Posts
    186
    Gear ratio is almost exactly the same, but if you are crazy about efficiency, the 21/50 will have slightly less rotating mass. Other than that there shouldn't be much if any difference. Remember to use a temp gun.
    Last edited by Is_It_Broken?; 09-08-2019 at 12:33 AM. Reason: More.

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