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As you said power Vs weight Lipo's currently win hands down but the trade off is robustness, they have a reputation, not always justified for catching fire. In other other applications (modeling)...

Belt drive looks like a great alternative. I wonder whether Zero uses a roller type swingarm clearence guide as wear might be an issue otherwise.
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Today my charger was delivered. http://ev-power.com.au/webstore/index.php/charging/charger-pfc-for-lfp-batteries-24v-25a-1.html

The other benefit is if I have the room I can add more batteries in the future to make it 72v,

It's all part of the experience of going where few have tread before. I guess I will have to work out the gear ratios to get the best of accelleration Vs distance for my paticular setup.

I ordered the batteries today as I decided to go 48v rather than 72v. luckily the motor and controller will work at both voltages MEO709 motor and Alltrax 7245 controller.
I made the decision so...

Found out today that my 100ah batteries are still 6 weeks away from being delivered. Still there is alot of other work to do.

I am currently converting a Kawasaki GPZ500S (EX500) and it seems to have a good amount of room for batteries, although I am considering making some slimline panniers to increase capacity. I think...