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  1. Cooper Discoverer AT3 Tyre/Tire Pressure

    I have Cooper Discoverer AT3 tyres fitted to my JL, recently been reading threads about pressures and dealers filling too high. Mine are at 38-39 psi and was wondering if anyone could tell me if that's about right or not for on-road use? My tyres are 275/55/20. Cheers! P.S. Please don't bite...