Hi Hogweed. I had similar recent experience - I put new Toyo TR1 on the rear, existing Toyo T1R on the front. After much reading on the forums, decided I had to spoend the money to find out if it was worth it. It was a wrench to get rid of the T1R, there was nothing visibly wrong with them and basically 90% new tread depth. But it was worth it; as soon as I got the TR1 on all four corners that horrible feeling at 65mph+ just disappeared. Go for it.