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A smaller number as a gear ratio means more speed. Higher ratios have higher torque and less speed. The size of the engine just determines hp and tq for that engine unless it is upgraded. The gear ratio and engine determine the vehicles top speed and acceleration. More torque means more power therefore more acceleration.

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Q: How the speed of a vehicle is related to engine speed and how tha vehicle speed is affected by the engine torque and gear ratio?
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