I had the bike out last week for the first time, being that warm weather is starting to come into my area, and I pumped up the tires, went and did a quick check over, and hit the park for a good ride. I just got back in today from another one, and I noticed that my back tire is wearing not poorly, but a little more than I expected. Maybe it's just me, but it looks wore down a good bit. I replaced them last June before a big weekend at a campground, where I rode every day all the time for 3 days straight, and then rode my bike the most last summer than I did the 3 years I have owned it combined. I did a few skid patches and stuff here and there, but mostly took care of the tires pretty good. My front is wearing fine. but my main question is, for those of you who ride alot and ride hard like myself all summer, how often are you replacing your tires? Thanks!