The relevant classes (ie non slicks) in the South West speed championships allow any road legal tyre except crossplies - 1b is not mandatory. So it's up to you, as it should be.
The trouble with 1a - and this is a point everybody misses - is that it creates problems as mentioned above. If list 1b and crossplies are not in favour, why not allow any road legal tyre except 1b and crossplies???
Point taken about golf balls - but tyres are so fundamental to motorsport - just seems ludicrous
as for more powerful cars favouring 1b you could also make the point that the lesspowerful ones favour 1a
looks like i'm in a minority on this one
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