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McKee M4 Quattro & McKee M5 Multisystem for Longboards Standard Rounded Square Tail Positons Note::For pintails add 2.0 cm (13/16") to both front and back side fin distances ::M5 Multisystem is recomended for all tail types if fin box is used ::A Thruster style longboard is not possible with the M4 or M5 longboard formula ::Recomended distance between trailing edges of back fins is 6-1/8" or 15.5 cm ::The positions given between 8' 0" and 9' 0" are estimates pending confirmation ::The positions given for 9' 0" are reliable due to extensive testing ::The positions provided will be updated as further testing is pursued: stay tuned :: Fins for M4 are M4 or G3000 (reduced size) on front with G1000 tail fins. ::The names M4-McKee Quattro and M5-McKee Multisystem are registered trade marks belonging to B.C.McKee ::The Mckee M4 Quattro and McKee M5 Multisystem fin formula are subject to copywrite laws ::Contact McKee for information on comercial publication and product manufacture