mountain to hybrid?
I ride an '88 Trek 820. I pull my two daughters in a trailer with it. We do primarily road and packed trail riding. I was told by the guy at the bike shop that I need new tires. I am looking for suggestions on what type of tire to get. I do not want slicks, as I need to option to ride on trails and suck. I also do not think I need big, fat, knobby tires either, and they slow me down quite a bit. What would you recommend? What brand? Could a person convert a MTN bike to a hybrid type by changing to thinner rims and tires? Thanks for any response.