Well, that's great service from an ST tire. The recently redesigned Carlisle ST tires are getting good feedback and might be a good choice since your last set lasted so long. Carlisle has been bashed to no end on their older ST tires and yet here is a set that lasted nearly a decade. Just goes to show you that any tire manufacturer can have some good and some bad over the years, although our Maxxis ST tires have performed without issue they are prone to the same issues that plague any ST tire when overloaded, under-inflated, or driven at speeds exceeding manufacturer's recommendations. For peace of mind mostly, we normally purchase a new set of ST tires every 5 years or so.