A lot of all steel cased tires on here, Ribs and Duravis. Another Duravis fan, replaced my 8 year old M895s that are no longer made with Duravis R238s. Had used 303 on the M895s and stored out of the sun the entire time and drove at least monthly. They had lost the last of their rubbery smell at about 7 years so I took that as an end of life indicator also. No cracking or other issues on 6 of the tires. The 7th was the spare that I was rotating with the fronts that developed a very slight sidewall bulge. But that was some time after hitting a ski area sunken drain grate at too high of speed.