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@Dammit
The ride that I did at the weekend involved a lot of cobbles.
I had 28c Maxxis Refuse tyres, initially at ~90 psi each.
Both of them pinch flatted, and after I changed the tubes they were at ~60 psi, mainly due to my little pump as the accepted wisdom is that low pressure=pinch flat.
However, they were so much more comfortable at this pressure that I left them there even when we hit a check point with track pump, and I did not get another pinch flat so it looks like that choice was vindicated.
However- if I had been running tubs would I have got those pinch flats in the first place?