I check the air pressure before every ride and often find myself between 5-10 lbs under. Tire gauges are cheap (check out Nashbar.com)...as I reminded my BF this weekend. We were prepping for a 20 mile ride Sat. morning and I was filling my tires. I offered to fill his and of course he said yes (grr...me in my nightgown wondering why I offered). His tires were only at 60lbs! Thank goodness I checked! He had no idea they had gotten that low!

Safe riding to all.