I agree with everyone else, 210 isn't that much weight to be concerned about damaging bikes. Get some fresh tires and brake pads and ride them like you stole em.
One idea to get some funds for that city bike, if you have the original 4 spoke spinergy wheels and if they are in good shape you can sell them and get a pretty good amount. I sold mine on ebay for 650 which is a bit high but I had all of the original paperwork and mine were in perfect condition. They usually go for around 400.