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* The running surface changes the rate of abrasion if that's the limiting factor. Rough concrete or asphalt will erode the shoe more quickly than a smooth surface or dirt.
* How much wear is too much also depends on the individual runner. Some runners may tolerate very little wear, but I know runners that can continue to run injury free in shoes that most people would consider destroyed.
{| class="wikitable"
|- valign="top"
|[[File:ShoeWear1.JPG|none|thumb|x300px|This picture shoes the compression of the midsole that occurs under the ball of the foot.]]
|[[File:ShoeWear2.JPG|none|thumb|x300px|Here's a cross section through the same shoe, showing how much thinner the foam has become due to wear. (This is from a left shoe, so the ball of the foot is on the right of the slice.)]]
|}
=How Far Can I Run In That Shoe?=
Many shoe reviews talk about "this shoe is good up to half marathon", or some other distance. Such advice is based on the idea that many people find that as the distance increases, they want a little more cushioning to protect their feet from the pounding and to offset a little of the fatigue that sets in over time. However, because different runners want radically different levels of cushioning, generalized advice is unhelpful at best. Some runners may want a [[Minimax]] shoe when they run a 5K, while others will run a 100 mile race barefoot. There is no maximum distance that can be run in any given shoe; it depends on what you want. I compare cushioning levels provided by the shoes I review, but remember a thicker, firmer shoe would have the same cushioning rating as a thinner, softer shoe, but would feel rather different.
=Shoe Gallery=
Images of the shoes reviewed on this site can be found in the [[Shoe Gallery]].