DH, my friend, and I all flatted on our road ride today. It looked like goatheads, or something similar, were the culprit. What do you think of tire liners? Do they negatively impact the quality of the ride? Is there a particular liner that is better than the others? I'm riding a Felt F3C, if that matters at all. The LBS is very anti-tire liner, for some reason.

DH tried a fix-a-flat type thing (the can of goo and air, whatever it's called) on my tire first, and it didn't work. (I should note that he didn't read the directions first and didn't shake it up. ) When he flatted after me, I read the directions and shook the second can up and it worked just fine for him. He rides sew-ups. Does the fix-a-flat stuff work on regular tires if you actually follow the directions, or is it best for sew-ups? We were in a somewhat remote area and, if I were riding alone, I would prefer to use the fix-a-flat stuff because it was much faster than changing the tube.

Thankfully, my friend's tire didn't go flat until she got home!

Thanks.

Alex