I received these shoes after a year with the GT-2130. They fit the same, but after a few months of use I went back to my old 2130s. It seemed like my knees hurt every time I ran the 2140. Yes, my knees aren't great anyway, but I've never had as much pain on the 2130 as I did on the 2140. For some reason, they just transfer more impact to your body. It's hard to understand, but one day I can use my 2130 and feel great, and the next day I can use my 2140 and feel lousy. Also, the outsole seemed to wear out much quicker than the 2130s. So again I looked for 2130s on ebay and bought them.
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