my 05 xstar with mcx came with 13.7 X 17. way underpropped for anything but cruising and casual wakeboarding. rpm was 3,050 @ 21 1/2 mph. erci johnson at oj told me to get the 14.25 X 14.0 with 110 cup. unbelievable difference in hole shot, holding speed and steady pull. however, the rpm went up to 3,400. that's a lot more wear on the engine and a LOT more gas consumption. eric just advised me to change to a 14.25 X 14.5. he said that would drop the rpm 200-300. i will have a Little less ability to heavily load the boat but just as good of a hole-shot and steady pull without the gas-guzzling. IF i am going to put 3000-4000 lbs of ballast in the boat then i will stick with the 14.24 X 14.0. however, i have never done that but i want to someday just for a goof. good luck, but the answer lies in your application and how you will weight the boat.
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