I got to an indicated 255 km/hr (158 mph) and still not at the end. Had a tankbag in front of me which made it impossible to tuck in behind the small screen: very hard work at that speed!
Was able to keep up with ... a '98 CBR600R ... just to put things into perspective...
Ordered the Wunderlich doublebubble; they actually claim it will lead to a higher top speed due to better aerodynamics!? I'll give it try some time and let you know...
Fastest mine has hit was on the mountain.
Wasa bit busy to look very closely, but it was just under 160, 158 or 159 indicated and wasnt picking up anymore, however it's slightly uphill on the mountain mile.