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Fin Groups Front Fins Back Fins Function G3 side G3 side Positive drive: crisp reaction:shortboard:Original standard: mid weight. G3 side G3 centre Smoother turn transition:shortboard & gun:mid weight . G3 side GM4 side Reduced area tail fin:looser tail:shortboard: light-mid weight . GM4 side GM4 side Reduced area McKee designed fin for lighter riders or smaller waves. GM4 side GM4 centre Reduced area with double foiled tail fins:lighter riders:smooth G3 side G5 side Mega-drive with flexed propulsion:shortboard to mini gun:mid-heavy weight G3 side G5 Centre Mega-drive with smoother transitions:shortboard to mini gun:mid-heavy weight G3 side G3000 side Solid front-fin + tail-fin flex provide easy turn initiation drive and hold:mid weight G3 side G3000 centre Softer feel: less drive but instant turn initiation:mid weight TC White-line side TC White-line centre Positive drive:crisp reaction:pivotal:shortboard to mini-gun: mid weight YU side YU centre Excellent gun mix:very pivotal:drive with fluidity:all board types:mid-heavy weight G3000 side G3000 centre Flex providing drive in smaller conditions:smooth: light to mid weight riders G3000 carbon side G3000 carbon side Very crisp feel:light:drive and balance:shortboard to semi-gun:mid weight G3000 carbon side G3000 carbon centre Smoother turn transition:shortboard & gun:light-mid weight G5 carbon side G5 carbon centre Mega hold and drive:smooth:needs strong surfer or heavy weight G5 carbon side G3 carbon centre Pivotal:drive but smooth:mid-heavy weight K2.1 side K2.1 centre Maximum size recomended for strong surfer or heavy weight:pivotal Notes :: Stiff side fins give drive if on front.When on back can provide drive but less predictable hold depending on flex :: Central or fully-foiled tail fins provide less drive than flat-faced side fins but allow easier & more fluid turn initiation :: Bigger front fins than back fins provide a more pivotal feel: Bigger back fins than front a more directional feel :: Remember that 3 fins plus one equals more combined area and not less: If a tracking feel occurs, reduce area :: The fins named GM4 are a reduced area version of the G3000 and are the missing size for light-weight riders :: There are many fin mixes possible, the versions provided should be treated as a base for exploration :: The names M4-McKee Quattro and M5-McKee Multisystem are registered trade marks belonging to B.C.McKee