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No, having a 4x4 drive drive train gives (or can give, depending on the design) more control - which is why I said what I've underined above. Anyway, going by your comments about truck tyres, and the stuff about tread patterns (if you mentioned wet conditions you'd have a point) I think I'll give up. The info I have comes from Tedley, who was the vehicle dynamasist at Rolls-Royce Motor Cars when I worked there, and Marky-Mark who was tyre technician for a Word Rally Champoinship Team (they won) and is currently preparing to go to Brazil for his current job as tyre technician for a Formula One team, gaining these posts on secondment from Michelin (Stoke) - which specialises in truck and, until recently, 4x4 tyres (of which I have a set development OR's on my 110 at the moment for evaluation).
Richard