I am a road cyclist and use them on all my bikes. I started using it a year ago. I don't notice any difference in the performance of my tires, but then again I ride my bike as a hobby and I'm not a professional. I haven't had a flat tire since I started using Tuffy cords. In fact, I've ridden without flats for so long that I had to replace the rear pipe due to the valving failing. I was also able to run a cut/cut tire and didn't get a single puncture. I may have tried my luck, but these things worked. They are easy to install and you can do it yourself. I run size 25 Continental 4000 s2 tires on Enve wheels. My friends who ride tubeless or tuff guts always laugh at me and my innards, but I've never been to the side of the road (in the rain) and fixed a flat since I've been using it.
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