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How to work out speed and rpm?

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hey guys is there a way to work out how many rpms your engine will be doing at a particular speed and gear?

i have a 2000 ktm 520 exc with 6 gears and a final ratio of 14:48

so if someone can help thanks. also, what is the red line (danger point) of this engine? and when does it make its most power?

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You need primary drive ratio, transmission ratios and rear tire diameter as well as final drive ratio to calculate speed from engine RPM or engine RPM from speed in each gear. Can't answer the other two questions for you...

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william1 thanks but isnt this a general question that doesnt have to do with a particular bike?

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