I have been riding my Diamond Back Hybrid now for a couple of months and I am close to needing new tires. I have a little over 400 miles on this bike and the tires are showing some wear. The tires that came with the bike are 26 X 1.95, and I think I would like to replace them with something like a 26 X 1.5. I would like a little less rolling resistance but, I am not sure if the thinner tires can go on the same wheel. Most of my riding is in Town on sidewalks and roads (for exercise), with a little hard packed trail riding. I usually ride around 20 miles at a time and my longest ride is 30 miles. Any opinions on what tries I should be looking at?