I too only tighten the tension just enough to prevent the tire from slipping, otherwise the only tire issue I've seen is some rubber transfer from the tire to the roller. Apparently at times after using, the heat from the roller causes the rubber from the tire to deposit onto the roller. I back off the roller when done, I have had the unit so hot you can't keep your hand on it.

There is the mind numbing boredom to contend with.