Losi Eclipse tyres work well on both in the dry, haven't tried them in damp or wet conditions.
on dry tracks Astro Fastrax bullseyes are easier to drive than Kourse Kings as they are softer and flex without snappy grip roll issues.
with damp/wet astro then its kourse kings... although found proline calibers work quite well on rear of 2WD if its mildy moist!
Its all down to preference and opinion plus of course driving style and budget.
I have sworn by Kourse Kings as my favourite for a while but they can become too much on some astro tracks without lots of trimming spikes... as Jimmy will agree after the SCT National last weekend... would assume that they are no good for dirt tracks as they are too stiff and will dig holes rather than grip
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