And the reason cruisers rev lower is because v-twins have longer strokes. Japanese-designed vtwins are built differently and rev higher than american-designed v-twins.its ALL about gearing..
my guess is that the manufacturers know that most racers will change sprockets for each track, so they picked an "all around" gearing ratio to work everywhere..
That applies to Supersports mind you.. the cruisers will rev much lower at freeway speeds.
I mean, there's a ton of other variables like valvetrain, gearing, crankpins, etc. But this is the reason that an american v-8 redlines at 6k whereas an Italian V8 can redline at 12k. They generally have shorter stroke and the valvetrain can spin faster because of it. If I'm recalling correctly.
As for your question, my EX runs at 140 kph (88mph) at 7k with stock gearing (16/41). In 6th each 1000rpm = 20 kph.
My friend's CBR600f4 ran at 140/7000rpm as well. But he has way more revs than the EX.