What would be the ideal X dimension for a 21 Superboat with SBC/Bravo for all-round lake use? The boat is actually a Challenger but finding current info on these few I/O boats is very difficult. Often they seem to be running their original deep setups because of limited transom height. A Blackhawk or Alpha SS are not being considered but increased transom height is available to mount the Bravo higher.
Phil

I/O 21's are pretty rare.

you would be safe at 18.5

Thanks