Originally Posted by reconsmr
Its hard to believe based on more powerful bikes not able to go much faster is all. Indicated 90+ is not necessarilly 90+ in real speed.
RPMs at 80 in 6th?
Kawasaki's Ninja 250 only puts out 27 hp and it just went 92 mph for Cycle World's road test. (June 2008)
By my calculations [RPM= ((Final Gear Ratio * 168) * MPH) / Radius] the WRR would be turning 8,074 rpm at 80 in sixth, but possibly the radius of the rear tire isn't a full 13.5", in which case it would be turning slightly higher, possibly a few hundred rpm higher.
Anyway, if you were going for a top speed run, you would probably rev it all the way to 10,000 rpm in 5th, so you'd be going approximately 88 mph before you shifted into 6th.