I'm fairly new to mountain biking (but I'm not new...), and I saw a mountain bike today on a city bike route that appeared to have the crank inside a gray box, rather than what one normally sees as a crank. The rest of the bike was quite normal looking, front shocks, Fox brand, hard tail, good condition, rider looked like he knew what he was doing. Does anyone have any idea what I may have seen, or would this be some kind of a custom job. I did not have a chance to take a picture or ask the rider about the crank cover. It did not appear to be a motor, or motor assist.
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