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I have a pair of Nike Free Run shoes, which I am very happy with! Since May 2013 I have been using them. I have racked up roughly 400-500 miles since then. When should I upgrade?
I am conscious that I have the Berlin Half-Marathon (30th March) forthcoming so I would rather change them sooner, rather then later. I predict their time is up, even though they still seem suffice.
Also, I read a little about having two pairs of trainers for people who clock up a lot of mileage. As it takes 24 hrs for the shoe to replenish its shape after a long run. What are peoples thoughts on this?