Can't comment for a 75 kg intermediate but for my 65 kg, the difference between F158 (+70 stock fin) and iSonic 133W85 (+Select RS7 55 cm fin) is less than 1 knot for getting planing in the low wind range with a Code Red2 11.0 m2 : 6-7 knots versus 7 knots. Pointing upwind or running deep downwind is of course not the same...
Cheers !
JM
Last edited by Jean-Marc; 18th April 2008 at 01:43 AM.
Reason: typo
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