Okay, well I was trying to do the cheap way of protecting against flats and I cut up an old inner tube and set it inside the tire, then put my new inner tube in. I only did it in the front tire. Haven't gotten a flat in about three weeks, but it feels as if it's been a bit of a speed reduction. Then I heard about these Mr. Tuffy things. Are those lighter than an inner tube? And are they worth it?