the DB2 and the Team C TM2 and Xray XB4 2wd are also well suited to stupidly high grip as they are all forward motor or what ever it is.
as others have said the tracks chosen for the nats stand up well in our great british weather, they are also the tracks that offer the best tunning ability for the driver in terms of tire choices
RHR dirt must run on holeshots which over here are expensive. so it seems a bit silly to make everybody buy a set of tires for one race.
Astro is also the standard in the UK due to the weather so i'd imagine many drivers would complain that they didnt have enough track time to practice on dirt.
but with many of the americans now sugaring the dirt tracks it gives similar grip levels to our astro
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