In the early 2000's I had a blowout on a rear tandem, later in that trip the paired tire blew, probably due to damage/stress when the first one threw rubber. The damage was significant but repairable. Fender, fiberglass, wires, etc. My thought is that even with steel cage guards on the fender the force of the thrown rubber at 65mph would rip the steel from the mounting which could do even more damage. I replace my tires every 6 to 7 years, even with lots of tread. Yes, it is expensive, but like insurance, it is the cost of travel. JMHO
