not sure how a added on mid drive would work out. ours was built with a bosch mid drive and it has its quirks with the motor in front. wife can peddle while I don't so nothing lis locked together. it takes a lot of learning to work out how to do it well. but the motor has not caused too many issues with the drive train so far we got about 2000 miles out of the chain. maybe more but we had the chain jam together once and I think that screwed up the link on both chains. the motor cuts out at about 19 and thats where we cruise at. we can climb 16% grades for a couple of blocks.