Quite new to this area and am looking for any info, particularly reliability on this brand of very small (font wheel in this case) motor made by the Zhejiang Chaoji Electric Technology. I rode one and it seems to fit my needs. but I would like to know if anyone has any comments re - well anything. They also make a small and v. cute 33v 6.3ah battery looks just like a drink bottle. The motor is a 33v 250w. I am also trying to find information about the term 'revolutions' as applied to these geared motors. I realise that the smaller the number the more torque, the higher them more top end speed. I am looking for a conversion that will help me with a couple of hills on my regular route, but is it that simple? the lower/torqu=ier the better? they have quite a few options -160/170/185/200/215/235/260, is there a lot of difference between these?