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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So from high school physics, power = force multiplied by velocity. If you make a higher gear to go faster, but have the same amount of power, the force you’ll apply in this gear will be less. And, the faster you go, the greater force you need to apply to overcome wind resistance.
In fact in most cars, you can’t go top speed in the highest gear… the higher gears are only added for fuel economy. You’ll go fastest in the 2nd or 3rd highest gear.
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