Newbie question re: sprocket sizes for project scooter motor

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rookie77
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Joined: 04/11/2011
Points: 3

Hello all. I am a newbie here, sorry. My question is I'm working on a little scooter project but I don't know about sprocket sizing; either for the motor shaft or for the rear wheel. Is there a chart or reference to get the right sizes...and quality manufacturers? (I hope this forum was the most relevant to this topic).
Thanks for your time,

-R70.

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colin9876
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Joined: 10/23/2008
Points: 289
Re: Newbie question re: sprocket sizes for project scooter motor

It does depend on the power of the motor and size of wheels etc, but a good place to start is to try and get the lowest gearing possible!
I had a razor 300 scooter (it was 250w DC with 12teeth on motorsprocket and about 50 on back wheel)
It was terrible up hills. Managed to get a 11 tooth sprocket for the motor and this did improve its overall performance.
It didnt seem to reduce its top speed significantly but made it better on any kind of slope

LeftieBiker
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Joined: 07/09/2011
Points: 654
Re: Newbie question re: sprocket sizes for project scooter motor

Basically, keep in mind that front sprockets are usually cheaper and easier to install, but they make much larger changes in gearing, because of the smaller total number of teeth. As for determining the correct gearing for a given setup, you need to know about the motor: how fast it spins, how much torque and 'horsepower' it produces, etc. You also have to factor in the size of the rear wheel, and how fast you want to go, plus whether you want it to have more acceleration or a higher top speed. (Even here it gets complicated, because final gearing that is too high will actually reduce top speed. You want the motor to be able to reach its rated top speed without having to pull too high a load for it to handle.)

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