hello all i just got my kit in from ebay. it was only used for 30 miles or so he said. i just mounted it on my 30 year old ten speed. it was a little hard to get going with no intructions lol. but i got it. .. my bike already had a computer and so far it tops out at 28 miles per hour. i was told it was a 80cc but then i think its a 66c from what i been seeing. its a power king motor from what the piece of paper said. i love it and ride it every chance i get.