Interesting discussion. Iíve gone through specs for major brands slalom/race 7,5-ish sails and just about all manufacturers recommend 4,60 masts and long extensions for these sails. Except for my Gaasta gtx 7,5 which have a 4,90 mast specified as ideal. What do you think about running a 4,60 with long extension in my gtx instead? Reason for asking is that Iíve read a couple of post from people arguing that slalom / race 7,5ís will be not rig ok on stiff 4.90 masts. Which in turns contradicts to Gaastraís specifications.