For those who have worn the original tires down to the point that you replaced them, please post how many miles you had on the OEM tires at the time of replacement. Please indicate If you replaced the tires prematurely. For example, you were going to a track day and you knew that the sponsor would require at least 50 percent tread life and your tires were borderline so you changed them to be safe. I'm just curious how the rubber composition will hold up. And yes, I know the number will vary due to riding stile and personal opinion about when a tire has become unsafe; i.e some will ride tires until the belting shows and some will change tires when considerable tread life remains. You might also indicate what your riding stile is; hard and fast, slow and easy, or in between.