Having ran a supastox 1s 13.5 and a 2s 21.5 at the Chippenham winter series, I can say the 2s 21.5 is a lot faster. However, at our club nights(and chippenhams), the difference is a lot noticeable as the track size is that much smaller. Generally I'd say 21.5 but I believe thus isn't the default brca racing preference out of the 2.
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