I changed out to the 18 sometime back (great on the highway), but am thinking of putting the 16 back on after the 904 gets broken in, just for fun. And maybe warm up the tire a bit.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter