On bad roads lightweight 19s is the way to go (more sidewall and lower mass).

The Vredestein Ultrac Vorti tires are a best seller in the UK....

Vredestein Ultrac Vorti | the Vredestein Ultrac Vorti reviewed and rated - TyreReviews

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!