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Originally Posted by rat_rod_rui
well looks like this post went dead 5 years ago but im hoping to get a response, i know this is an eco forum but its the only place that seems to have exactly what im looking for. my little vt500c ratbike needs a lot more top speed, its been heavily modified for more power but that just gets me to the factory top speed quicker. what would you say was your final result of top speed if you wind it out all the way to redline in 6th gear?
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Sounds like you need taller gearing, and max speed will be reached at max power, not highest RPMs unless max power coincides with max RPMs. Specification sites seem to indicate max power happens at 9000 RPM. Since your bike is heavily modified, it may shift the max power higher in the RPMs. You could get a dyno run done to figure out where your bike now makes max power and make sure your tachometer agrees with the actual RPM, as they are often inaccurate on motorcycles. After that, figure out what RPM your bike is at during top speed, if it is higher or lower than max power, you are giving away speed. Adjust your gearing accordingly.
If you didn't know about it yet, gearingcommander.com is an awesome site for this purpose.
EDIT: Looks like the VT500 is shaft driven, not much you can do about that, other than put a different sized tire on the rear.