Switched out the tires on my road bike at 4,000 miles, and they were still in great shape. But, we had RAIN (Ride Across INdiana) coming up and didn't want to tempt fate. Michelin Dynamics at less than $15 a tire -- go figure! DH rides more expensive Michelins, but the Dynamics work for me, so I stay with them. The roads here are mostly chip-and-seal (bad chip-and-seal at that) with patches on top of patches on top of patches...