I'm Propelled to Comment

Sometimes when riding a bike down a rather uphill road, (sometimes it seems uphill both ways) riding can become more tedious than fun.  Sure, some find that a challenge and attack it with zeal, but others find it an obstacle to being more active on their bike.  With electric assisted models becoming more prevalent in bike shops for just such a market, it is no surprise that others would seek to find their own way to profit from the trend.