Quote Originally Posted by KnottedYet View Post
From a cushion standpoint, there is no need to replace shoes as the cushioning loses its sproinginess.... However, from a distortion standpoint it is very important to replace shoes if they become distorted from wear to the point they are interfering with posture or efficiency. (the heel that is almost completely worn off on the outside, the ripped lateral fabric, the pulled lace-holes, the burst gel bladder, etc.)
Yeah, that's where I'm at. Both pairs have around 400 miles on them, so they'll be hitting the 500-mile mark before race day, but the only visible wear on them is the squashed-down soles. I'm not noticing that they ride any different than they ever did.

Interesting that in the study you linked to, there was enough wear after 200 miles for a measurable change in gait. I always found it annoying that my soles squash visibly after only 100-150 miles. I'm not that heavy, nor that heavy-footed.

I wonder if I can get away with racing flats... I just saw a review of the new Mizuno Wave Universe 3, and they have a SUPER square toe-box. Wonder how the heel width is. I may have to try a pair of those on. Shoe salespeople run when they see me coming.