milov, on Jul 27 2007, 05:07 PM, said:
I currently have six pairs of useable road shoes and five pairs of racing flats. I rotate the shoes giving them more time to recover. If a pair of shoes gets used once a week instead of once a day then you get a far greater life expentency from them.
I have multiple pairs of shoes, but that's just so that any biomechanical disagreements I get from one pair of shoes are likely to balance out those of another pair. It sounds silly but since I started rotating different models instead of just a second pair of the same thing, I stopped getting so many niggles.
As for the life expectancy of your shoes... I'm always confused about the implications of this for ultra runners. Say your average runner is doing 10km per day... and changing shoes each day to keep them springy. If the ultra runner does a 50km training run, does he/she need to change shoes every 10km? If the ultra runner alternates shoes daily, after running his/her average of 30km, should the non-ultra runner only alternate shoes every third day? *confuzzled*
In addition to the materials and type of shoe, etc., I think shoe life is very largely related to how perfect the shoe is for you. If it perfectly complements your running and doesn't fight you at all, it will last longer. If you have a few disagreements, it will wear in strange places and grow to be less comfortable, so you will want a new shoe, or you will notice niggles. If you fight it all the time, then you should wear it down quickly - which is probably a good thing!
Since I found my Merrell Overdrives, I no longer change shoes during ultras. I went through three pairs of shoes in 100 miles at Glasshouse last year - fighting them - they were pretty much completely destroyed. I've done three long ultras in these Overdrives without needing to change during the race. I am in love.