This would have saved so many of my tights.
https://twitter.com/oyashiro8931_m/status/883913495921676288 …
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http://christinibicycles.com/ - or you can have two chains: http://newatlas.com/tretta-awd-bicycles/25203/ …
O M G never wear tights with this! 
Usual chain. Shaft from pedal axle went up towards handlebars and another down to a front wheel gear like you posted. Will search for it..
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