I bought an Astro 3210 10T at 48V and planning to run it on a 15:1 ratio. I thought of having 8t to 120t but wearing would be really fast and it would we noisy.
I fabricated a #35 120t sprocket but it is too big for 20in tires. I am having problems with the sprocket selection because I want to have a smaller diameter for the sprocket.
From what I have read and recommended by Miles a #219 sprocket set would be the best, the problem is I could not find formulas or calculators for #219 sprocket.
Or can #25 set is another option?
#219 and #35 comparison
Miles wrote:That's the problem. 15:1 is a lot to achieve in one stage.
Using 219 chain would reduce the sizes a bit.
Maybe #25 chain would be enough? It doesn't really matter if it wears quickly, as long as it's ok for the duration of the event.
I think 12t should be your absolute minimum size for the drive sprocket.