[sanddrag]

I am 99% confident that I understand what is meshing with what in your transmission. What I'm not confident in is that you have calculated your ratios correctly.

As I see it, in high gear you have a 12:30 reduction with a 60 tooth gear that just so happens to be idling in the middle connecting the 12 and the 30. If this is not the case, please let me know as I'm curious to find out exactly what I'm not "getting." I think I know what I'm saying, but sometimes I get locked onto an idea only to look at it later and go "oh yeah, huh, I was wrong"

So for now, forget about the low speed side of the transmission. All I want to know is if high gear goes 12:60:30 (: represents mesh)

If this is true than your maximum free speed (no load, theoretical) will be somewhere around 2120 RPM in high gear (at the box, not after sprockets) depending on what free speed number you use for the Chia. With a 10:24 sprocket setup and a 4 inch wheel I calculate this will give you a 15.4 fps theoretical top speed, which might amount to something like 14.5 fps in real life which is good for a top speed. I just wanted to make sure we are both on the same page when it comes to the reduction/rpm calcs.

EDIT: I'd prefer not to work with any fancy spreadsheets for the purposes of my questions to you. I'd just like to see how you came up with the 742 rpm. Thanks.