How often do you replace your running shoes? Should it be based on mileage only? My doc told me shoes need replacing long before they start to look like they need it - that the insides wear out much faster than the outsides. But I'm not certain when that is. I'm trying to find that balance between being cheap and smart. Thanks.

Between 300 and 500 miles is what I've read; however, it really varies from person to person. A heavier running will wear out a pair of shoes faster than a lighter runner will.

I have heard the 300 - 500 mile range as well. Pretty big range though - 200 miles is a lot of running. I'll give you the benefit of my (painful) experience though. Tried to make some shoes last a little too long (I loved those shoes) and ended up with a two year bout with plantar fasciitis - not fun. Don't know for sure that it was the shoes but I take no chances now - 300 miles and I get new shoes.

stealthbiker: 2 years dealing with plantar fasciitis - that's terrible! I'm keeping tabs on the miles I have on my shoes and plan to replace them sooner rather than later.

300 miles?! geez....then i'd almost have to buy a new pair every 6-7 weeks!!

i guess that's why they say you should also always use at least 2 pairs at the same time and alternate. i think you can get a little more mileage out of them that way. the other benefit is that your feet are supported slightly differently. this trains the muscles in the feet, making them stronger and less prone to injury.

oh man...i think i need a new pair after reading this thread! i'll wait 3 more weeks and get a pair at the expo at the marathon i'll be running...

Yes - miles
I never go over 350 miles for any of my shoes...also the companies that I test shoes for never have me run more than 300 miles for a test. Also, IMHO I firmly believe you should have at least 2 pairs (from different mfg) in your training rotation. Currently, I have 4-pairs in my rotation, and will go through 9 (or more) pairs for the year. After 350 miles, I wash them and either use them for lawn duty or mall shoes - or for the most part donate them at the end of the year as they still make good casual shoes - but not for running.

As a clydesdale that can only run on pavement living in a downtown area, no more then 400 miles on any of my Saucony Triumph's.