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Check your owners manual but I have a 01' Disco and it calls for 28psi in the front and 38psi in the rear. I am running the Goodyear Wrangler HP 255/55r16. Hope this helps should be the same in '03.
Hey thanks for some input berg, I had checked my manual and just thought the numbers sounded off. 30 front and 38 in the rear...who am I to question the owners tech manual though?
The manual is correct, the reson for the high pressure at the back is to allow for the extra carry weight. Don't forget your disco is capable of pulling another 3.5 tonnes of trailer behind it.