Standard #40 chain will also fit a bicycle sprocket like the one on these motors. Like bike chain, #40 is 1/2" pitch. #40 chain is wider than bike chain, though, so the reverse is NOT true. Trying to fit bike chain on a #40 sprocket won't work.
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From: "Steve Tyng" <STyng-at-acptrust.com>
Derek wrote:
> I guess I'm still confused about the pitch of the sprocket on the motor. Is it ANSI spec chain or is bicycle chain not ANSI spec?
It is a 1/2" (12.7mm) pitch by 1/8" (3mm) thick sprocket. It is designed to work with the chain on a standard 10 speed type of bicycle. You can scavenge matching sprockets from a bicycle or wait a couple of weeks. I am having matching sprockets machined and will be offering them on the TyngTech site.
The original intent for this motor in China was for electric powered cargo bicycles and tricycles. The motor is all ball bearing construction with a very substantial gear reduction. It is a very robust motor.
Steve Tyng