When does the wear on the sole of a running shoe severely compromise its cushioning?
I land very much laterally (but roll in, so I'm not a Supernator) and I think scuff a little on my right side, which wears quicker than other areas. On my older shoes the sole's outer (4mm?) different coloured rubber grip layer part (if you know what I mean?) has worn off completely where I land.
Can't you tell the difference with the older and newer shoes when you run in them?
If the old ones are as comfortable as the newer ones, they are fine.
(Unless the newer ones aren't actually that new, and both have worn out!)
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