i run a 14.75 X 15.5 on my 08 xstar with L18. if you only moderately ballast an L18 you should go with the 14.75 X 17.5. these suggestions came directly from eric johnson at OJ props. still the best thing to do is contact eric and tell him your boat, engine, prop, altitude, transmission, and primary/secondary use for the boat. he will steer you straight and he doesn't care if you buy the prop directly from him or from an OJ dealer. he is terrific to deal with. getting the correct prop is the single biggest improvement you can make to your boat. it changes everything for the better.
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