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No other final drive design has the gearing flexibility of a chain-drive system. Racers routinely change gear ratios to maximize speed and performance for each particular track. For the rest of us, a gearing change can enhance specific performance characteristics, like acceleration or fuel economy—and even subduing an annoying engine vibration. To determine the ratio, simply divide the number of teeth on the rear sprocket by the number of teeth on the countershaft sprocket.
What does that mean? Adding teeth to the front and rear sprockets have opposite effects. Installing a larger countershaft sprocket creates higher gearing, while a larger rear sprocket lowers gearing. Similarly, a smaller front sprocket lowers the gearing while a smaller rear sprocket makes gearing higher. This entry was posted in News on March 16, by Admin.
E: support sunstar-braking. Sign in Or Register. With torque in foot pounds:. For the rider, torque is the all-important factor. The torque peak is the point at which the bike has maximum acceleration, either side of this peak it is less. For a given torque at the rear wheel, the acceleration of the bike is the same, irrespective of the engine speed. Horsepower increases with the engine speed until well after the torque peak, and only peaks when the decreasing torque compensates for the increasing rpm.
The acceleration at the torque peak is greater than that at the power peak. So why do we talk about horsepower so much?
Consider a large waterwheel. While it's obvious that the water wheel generate a large torque, its rotational speed is very slow and hence its power the ability to do work over time is low. A waterwheel is therefore not generally very powerful. A powerful engine with lots of horsepower is one which produces high torque at high rpm. Theoretically, producing torque at high rpm is better than producing torque low rpm, as at high rpm you can use gearing. A powerful engine is useful because it can then be geared down - you don't want the rear wheel of your bike doing rpm anyway!
Gearing down reduces the speed at the rear wheel with a corresponding increase in torque. This does not affect the power of the engine apart from frictional losses. Incidentally a properly lubricated chain drive is Want to increase fuel mileage and decrease engine wear on long highway runs?
Just reverse that advice. The purpose of changing sprocket sizes is to alter the relationship between engine speed on your tachometer and road speed on your speedometer. The ratio is 43 divided by 18, which equals 2. Switch to a tooth front sprocket and a tooth rear. Now the ratio is 2.
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