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@Smallfurry
True.
All of these are pretty constant for the fixed bike as its not a commuter. So I ride mostly in dry conditions. The commuter is in used on and off road, as well as for load carrying/trailer pulling, so the pressures vary quite a lot (use semis slicks, low pressure brings side knobs into play) with regards to conditions and planned load.
Conversly
Planning on running my Weirwolf 2.55 29er tyres at under 30 PSI. This should give me half an acre of traction surface per tyre (if my calculations are correct)