Why can’t vehicle manufacturers add an extra gear to increase top speed?

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Say for example a 125cc motorcycle with 6 gears has a top speed of about 75mph, why can’t they make it with 7 gears and surely that’d increase the top speed?

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Anonymous 0 Comments

It is possible to change the sprockets on motorcycles to increase the top speed while reducing the low-end power by changing the sprockets to having more (or fewer) teeth

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