Mr Tuffy tire liner, thank goodness Mikes bikes had it
"I use Mr Tuffy in my bike tires. Bought a new TREK Domane, and the bike shop does not like to install tire liners. According to the bike shop tire liners cause wear flats. I've been using Mr Tuffy tire liners for quite some time, and have not had a flat from, thorns, glass, etc, and NEVER a flat from a rub from the liner. Well, I didn't put a liner in my TREK bike, rode it for 6 months or so, got a flat caused by a thorn. Looked all over for Mr Tuffy tire liners, hope they didn't quit making them."