I believe the new official tire for the 2.5 Rockets is the Cruistec, was Avons. They used to promote Castrol with their bikes, them Mobil 1, and now.... I don't even know.
These official brands are business relationships between various companies and Triumph. Not sure if you came to the 2.5 from the 2.3 models, but we modified the he11 out of those bikes and not for the worse. Also, with both, the stock tunes suck. If you haven't tried the Penner Tune you are missing the near full potential of the stock bike. The engineers dumbed it down so as not to frighten previous Harley riders

.
Seriously, there are a lot of things you can do that veer away from stock that will not only not hurt your bike, but make it perform and handle much better.