E-Mountainbike Project

[BL_RV0]

Ok guys, there's been a slight change in plans. Well, first off- I got my batteries! Woot! They're from my old e-scooter, 3 12v 12ah, but they work great. So here's the plan: It's gonna be the same motor and ESC, and still 24v even though I have 36v worth of batteries. I'm gonna ditch the sprocket I bought and the idea of running a chain down to the rear gear cluster. When I grabbed the packs, I also got the rear sprocket and freewheel. It's a 80t #25 sprocket, and a crappy but working freewheel. So what I'm going to do is mount the sprocket/freewheel on my crank, a much better plan IMO. All I need to make is essentially a large washer, a spacer to adapt the crank OD to the freewheel ID- not hard at all. I'm going to order another primary sprocket from mcmaster, as well as some chain. The sprocket is a 1/2" bore #25 14t sprocket. With the gearbox and that reduction, it will match my highest pedaling speed- about 25-30mph. With the planned gearing, and my ratio from my "foot-powered" sprockets, I'm looking at exactly 25.7mph. Perfect. The ratios are 16:1 (GB), 80:14 (primary to secondary sprocket) and 16:40 (pedaling sprockets, gear up)... Some pics for you to clear it up incase my explanation is fuzzy...

Here's the layout (old sprocket not being used still installed)



80t #25 sprocket



Where that sprocket is going