thanks i also found this on devon 4x4.
Hi XXXXXXX,
Good question, at some stage, I believe, yes, along with any other tyre that is not “S” rated, this will rule out virtually ALL mud tyres, those that get a rating are likely to be cost prohibitive.
There is also the issue of the oil that is used for the manufacture of this type of tyre which is likely to take the cost of manufacturing beyond most people’s means.
I am told by those in the know, that within two years these tyres won’t be available. I don’t believe that it will effect an individual that already owns tyres such as these but they will no longer be legal to sell. I don’t know if there will be a way around these new laws such as sales to forestry workers only time will tell.
These comments are only my thoughts and understanding of the situation and are not necessarily correct, if you want a definitive answer I recommend that you contact the DOT.
best regards
Simon