Hi, just a few words of introduction, currently building an electric bike using a stanna stairlift motor running off four 36v 2.6amp lithium batteries, this runs a chain to the middle crank sprocket, ideally the crank should be freewheeling to avoid pedalling when using electrical power but having a job trying to find a freewheeling crank or the parts to make one, I know the parts are all avaliable but have looked on ebay and the internet but drawn a blank so far, can anyone help please, the idea is to use the bike for work to cut down on emissions and save money on fuel, the batterys will be charged by deep cycle batteries I have desulpated through an inverter for the charger, the deep cycle batteries will be charged by recycled garden light solar panels, I have managed to accumulate about 300 so far, will sign off now look forward for any ideas, regards Nigel 
