I put Rhinodillos in the wife's bike, she's put about 2,000 miles in the goathead and bottle glass capital of the world without a single flat. Same pair of tubes. Unlike Mr. Tuffy, the Rhinodillos have a little special soft bit at the end of the liner that prevents it from wearing the tube. Prior to installing them, she was averaging two flats a month-- and she only rides weekends.