Bridgestone can't recommend it for the Rocket because it's not the stock size. Simple as that. Don't go reading anything more into it. They make it for the C109, jut as heavy and almost as much torque.
edit: And by the way, that is not a "I use it so it must be OK" opinion. I asked the Bridgestone tyre rep when he was in the shop. He said he'd been asked before about the 240 Max on a Rocket. They're happy to supply them to anyone and very happy to see them going on Rockets as well as the big Boulies. They just can't recommend it.