I've never really had a liner wear a tube out from being chaffed by a Mr. Tuffy. Of course, I'll still swap out tubes for new ones every 2-5 years cuz a few items do get past a Mr. Tuffy so my tubes are somewhat fresh anyways. Remember to clean your tires from time to time, as a piece of glass or whathaveyou can work it's way through the liner if left in the tire.