Hi Richard, I just checked my sand tyres, they are Dunlop S5 or D16 (not sure which is the type) size is 255/90 (17s I think)
I saw some interesting calculations on the size of the contact patch for road and sand tyres on the Internet (cant remember the site) the example showed a huge increase in the contact area of deflated sand tyres, which got me all excited about buying them. The reality was different, so I can only conclude that either contact area dosent make that much difference, or that the contact area of a stationary tyre, as in the calculation, is different to the contact area of a rolling tyre, as when you're traveling at speed. I'm not saying the sand tyres are not better on the sand, they are, I'm just saying that for me, in a pretty powerful 4x4, the balance of the 'pig on wet grass' handling on the road v. the marginal improvement in the sand meant that I took them off, stored them under a hut, and there they remain!
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