I was very happy with my Gel Nimbus 12 but as they were wearing out, I got a new pair of GN13. Unfortunately the 13s give me some numbness in my feet after I've been running more than 5k. I've tried redoing laces etc to no avail. Switched back to my old 12s and no problem so whatever the miniscule change betweeen 12 and 13 is - it has had a negative impact. I am now looking for 12s that are being sold cheap as a clearance item and I'll just use the 13s for short runs. I would never have imagined that a simple upgrade could cause such a problem.
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M A Bibaud
