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Having run a FR in F4 and occasionally mono for a couple of seasons they seem to handle fine at 40mm, but they do tend to be rather different as you tend to have to run them with much softer springs. The quickest my car has gone round BH is high 49's where as I read Ian Pearson was down in the 46's, I would imagine with a young,slim quick driver at 40mm they should still be capable of low 48's.
I suspect that the quality of drivers at the sharp end of BARC are somwhat quicker that the FR racers in Mono/F4, which tends to increase the gap. I remember a few seasons ago one of the very quick lads in BARC came 2nd or 3rd in his FR in the Mono race at Combe on standard Michelins, which I can say dont work so well at 40mm.
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