For a 6 speed, that drop in RPM would be less, because there are more number of gears, hence the spacing is smaller. In a 5 speed, its comparatively larger.
All the benefits of a 6 speed will show up on a race track where you are looking forward to keep the RPM in the powerband all the time. Being in the powerband ensures best possible acceleration all the time. Also the motorcycle picks speed rapidly as long as the rider is capable of shifting swiftly.
On streets however, its better to have a torquee engine and lesser gears.
R15 V3 & FZ25 has similar power figures but the torque figures are different.
And HP is a product of Torque and RPM (Torque*RPM / 5252).




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