I have an Optima Stealth Alloy Mountain Bike and I have to be honest, I don't know much about bicycles. Basically, what are my options? I know I should get a pair of slick tires (26 - 1.5"), but is there anything else I should consider? If I changed my wheels to get 700cc, would I have to change the frame and is it costly? I would probably shop at Evan Cycles or Halfords. I look forward to receive resourceful recommendations and suggestions from you.