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@GA2G
I've recently lopped minutes off my commute from Lower Sydenham to Blackfriars. I realise that its definitely the tyre pressure. I now run 125psi on the rear, and 120psi on the front. Rear tyre is the normally Specialized All Condition at 125psi, but I take 5psi off if on the front. I mix and match with the Continental GP 4000, again at 125psi on the back, and 120psi if on the front.
This is beneficial to me as I'm a heavy guy, and 90psi, for example, means I'm actually riding on the rim. What are your tyre pressure choices?