A friend had really bad luck w/ a pair of those bottom dollar Aksiums that come with shady 23mm tires, wore through the braking surface in just about a year. Too much riding in the rain maybe w/ not enough hosing off, but he does wash his bike and I never do. He doesn't commute, just 3-4 weekly club rides ~20-40 miles. At least he never used the tires, replaced them w/ his regular ones.