Horespower is a unit that is used to measure the power of engines and motors. One unit of horsepower is equal to the power needed to lift 550 pounds one foot in one second. This unit has been widely replaced by the watt in scientific usage; one horsepower is equal to 745.7 watts.
Torque is defined as the engines rotational force. You may notice that torque - like horsepower - is always expressed at a certain engine speed. Generally speaking, a motorcycle will feel more responsive when peak torque is developed low down in the rev range, but plenty of people enjoy high-strung engines that need to be revved hard before they develop peak torque.
Now that you know that, how does this relate to you and your motorcycle. If you have a heavier motorcycle or if you are heavier in weight, you may want a motorcycle that produces higher torque in the low rpm range. This will make it easier to leave, especially on hills, without having to rev the engine high or slide your clutch. Constant clutch sliding can lead to premature wear on your clutch plates and burning. Now once your motorcycle is moving horsepower comes into play. The more horsepower you have the quicker your motorcycle will accelerate over distance.
This is the simple definition. Torque gets you moving, horsepower helps you to accelerate. Now that you know this it can help you to decide which motorcycle is best suited for your needs.
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