There light as a packet of fag's and usually plenty of grunt id say up to 60 be ok but after that the drag coefficenty of the brick erm i mean R would kick in :sad:
luckily they are not great in the handling department, also if you race long enough they will break down....or bits will fall off. Better make the most of them as it looks as if they are going bust soon.
Cheers
Phil
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