Originally Posted by
gneissdiscosport
Mine are 30" and the front left just starts to rub in reverse at full left lock. It rubs on the vent slats inside the wheel arch at the front. Only in reverse and full lock - which isn't a problem as the wheel rotates with the "grain" of the vents and won't rip the wheel arch lining off.
I feel pretty certain that if you go to 31" (and probably 30.5" as you have mentioned) that the tyre will rub without much lock on and/or under compression in a forward gear - which I think could dismantle your wheel arch lining if you're unlucky.
I'm also not really sure that you need to push the limits of tyre dimensions for sand driving in the DS anyway? If you get some 30" AT tyres on 17/18" rims I think you'll be amazed and the performance difference for the extra sidewall height will become negligible. I have the GG AT3 255/55 R19s and have been flogging my DS, fully loaded with camping gear, all around the SEQ/nNSW beaches at 40psi. I started out lowering to 26psi each time i left the bitumen but i just haven't been able to get the thing stuck yet. Now if i'm just day-tripping and it's mostly foreshore and a bit of backshore i'll often leave it at 40. save the time to re-inflate afterwards.
I will say that the ride is more stable at high speed with the psi dropped, though. So you can definitely feel the difference in grip. Overall, though, I couldn't be happier with the sand driving performance - still weighing up that spring lift though....
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