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@GA2G
I should mention that I have normally run the Halo Courier Berlin tyres at a minimum of 120psi to a maximum of 130psi (this was preferred for me). The over-inflation didn't harm performance of those tyres, but enhanced them. I would use 130psi on the rear only. The front I would run at anything from 100psi (dropping to 80-90psi when I forgot to check), to 120psi. I find that the halo Courier Berlin performs very well when slightly over-inflated. However, it is an individual experience, and I'd only recommend this sort of inflation levels for the heavier rider. The sidewalls on the Courier Berlin tyres are massively strong. Though I did have a sidewall blowout, I believe that it was from damage I had caused by taking a corner through glass shards. For a very light person, the Courier Berlin could be ridden when losing air, and nearly flat. The sidewalls are that strong.