What do rear sprockets do

This entry was posted on March 16, by Admin. 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. Forgot your password? Registration is free and easy! In other words, if you previously ran 5, rpm at 65 mph in fifth gear, expect the engine speed to increase Once you have a new ratio in mind, take a look at your bike.

Your dealer can probably tell you which sprocket combinations will work on your bike without other modifications. Remember, the engineers who designed your bike had a pretty good idea of what gear ratios work well with your bike at street speeds. Note that changes made to the countershaft sprocket have a greater effect on overall gearing than changes to the rear sprocket. In the example above, reducing the countershaft sprocket by one tooth changes your gearing by about 6 percent, while adding one tooth to your rear sprocket changes your gearing only 2 percent.

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 For road racing, this theory closely matches reality, but for offroad the above is not the only consideration.

The stock gearing of your bike is likely to have been determined by choosing a compromise ratio based on what worked best for test riders in "average" conditions. As soon as the bike is taken out of average conditions - by engine tune, terrain, track design or rider style the stock gearing might no longer be the optimum solution - a different setup might get you round the track faster.

Maximum speed occurs when the driving force is exactly counterbalanced by the air and rolling resistances. At this point the acceleration has fallen to zero. Gearing a bike up to produce higher top speed with less acceleration is done using a larger countershaft gearbox sprocket or a smaller rear sprocket. Gearing a bike down giving it more acceleration with lower top speed is done using a smaller countershaft gearbox sprocket or a larger rear sprocket.

The ratio chart shows the gearing ratios for different numbers of teeth on the gearbox and rear sprockets. The numbers given are the number of revolutions of the gearbox sprocket required to cause one complete revolution of the back wheel.