Wouldn't think so. They've done 280km running + say 50km walking, mostly on paths / grass, so should still be good for another 200k or so?
Thinking about it, now's a good time to get cracking with a more natural running shoe, and slowly ease it in right in time for the Brooks to pack it in
Thinking about it, now's a good time to get cracking with a more natural running shoe, and slowly ease it in right in time for the Brooks to pack it in