One issue with not replacing tires simultaneously is if you go with a single tire replacement that's got significantly different traction characteristics than the remaining tire. For instance, if you go with a fairly sticky front tire but the rear is the typical rock-hard OEM tire you may have a higher chance of the rear tire losing traction a lot sooner than the front in an aggressive corner, leading to a lowside. I replaced both my DunRocks at 3K because they were dry-rotted (at only 3 years old!) with Kenda touring tires, and since then I replace tires as needed with the same model. If I were to go to a stickier sport tire model I would replace both at the same time, then just replace as needed.
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