13.5s are still relevant. It just made me think of the 13.5/17.5 confusion that sometimes exists, didn't know if it applied here, just thought a friendly reminder wouldn't hurt.
But then again I forgot about Super Stock. So I was right about some being confused, but unfortunately I'm the schmuck! Good news, I bought a 13.5 before the rules came out, so either way I'm ready. Lets RACE!
Cheers!