OK, so I'm a retired old guy like many of you. I was never a serious rider and just got back in the saddle last year. Bought a Specialized Hybrid and it's very comfortable for me. Most of my rides now are 25 to 40 miles on MUP's and some on the road. I have increased my average speed from just under 12 mph to around 14 mph now. I ride often with my son and feel sometimes I am holding him back a little so I need to pick up the pace a little. The easy way would be just add another magnet to the front wheel but I think that wouldn't really help. My son rides a Jamis Coda and his ride is a lot lighter and quicker than mine, but mine is a lot better on my sorry old butt. Anyway I was thinking different tires would help and be a lot less expensive than a different ride. My Specialized has Alex DH19 rims (622 x 18) (18mm inner rim width) and Specialized Armadillo 700 x 38C tires that have a pretty aggressive tread. I was wondering what tire I may substitute that would help me pick up the pace. Could I go down to a 28C on the tires and would that help? Is there a specific tire you could recommend to decrease the rolling resistance? Thanks gents and ladies for your input.