Only the rear axle is controlled, you need either Schumacher mini spikes or Ballistic mini Spikes, any compound for both. Run what you like on the front axle. Basically it's the same as the nationals.
Usually it's Schumacher yellows in the dry and greens (schumacher or Ballistic) in the wet.
here's the official wording from the National entry form.
Control Tyres
: The 2013 National Championship permits only two types
of tyre for the rear axle at each venue.
Compound and quantity used is not restricted. Front tyres are a free choice.
The permitted rear tyres at all venues in the 2013 BRCA Off-Road National Championship are :-
Schumacher Mini-Spike
(Original & Mk.2) and Ballistic Buggy Mini-Spike.
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