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shift drum location clutch hub ring gear output shaft transmission gear crankshaft and primary drive gear input shaft transmission gear shift fork shift drum shift fork shift fork shaft nested between transmission shafts output shaft transmission gear upside down view newer sportbikes stack the transmission shafts on top of one another allows engine to be more compact crankshaft clutch hub ringer gear transmission input shaft shift drum transmission output shaft counter-shaft shift fork shaft gears crudely drawn for illustration purposes pins interface with shift drum shift fork shaft shift fork each shift fork is capable of selecting two gear ratios they can slide left or right on the shift fork shaft therefore a six speed transmission requires three shift forks a five speed transmission also requires three shift forks although there are only five gear ratios