I have a pair of the Nike Mayfly and I'm trying to decide when I should replace them. I'm nearing the 100k mark but they seem to be holding up. I am planning on running a marathon in November and don't know if I should try to race in my current pair or to buy a new pair. My concern is that the shoe falls apart in the middle of the marathon and ruins the entire race. I'm a lightweight runner 135 lbs and mostly run on my toes so I'm thinking that these should should last longer than 100k.
Let me know what you think.