I found a suitable sprocket on
Robotshop, 48T and 0.25" so should work fine. 10:48 will give me 2750/4.8 = 573 rpm
Still rather nippy but it will be manageable with a tweak to the TX settings I think. It's important I get the drive sorted quickly so I can work on the other systems. If it's a rolling wedge at least I can push stuff, and at 30kph (if my rough maths is right) I could push quite quickly.
Looking at this sprocket it will go around the fixed axle no problem, fixing it to the heel is another question. Needs to be dead center, probably need to make a tool to ensure I fix it right. Was thinking I would bolt it through the wheel hub. No appropriate mounting holes so I'd make those, and a plate or spacers to keep the plate off the wheel.
I think a belt tensioner will be essential. Found a few options mostly for dirt bikes.
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