As an expert in the tire industry, I always recommend Michelin tires for highway style tires. They do comparatively seem to dry rot a little faster than some others but the benefit of them far outweighs that. IMO after 4-5 years I would replace them anyway because the oil in the tires starts drying out. If the tires are used often, the heat built up in the tires cycles more, giving them a better, non dr trotted look (if they aren't exposed to excessive sunlight/ozone exposure). If they are used enough, generally the tread will be worn and need to be replaced at that time. If not they dry rot and need replaced. After all, I'd rather have good tread and need to replace them rather than no traction because they wore out too soon. I run Latitude Tour and you can't beat them for ride and handling from any T rated tire.