Why do Motorcycles/Four Wheelers/Go-Karts use 2 different sprockets?

I mena theres the one on the motor thats really small and then one on the wheel which is huge What if both sprockets were the same size as the one on the wheels would you not move at all???|||It's all about using the engine's power to move the vehicle efficiently. If you have a multi-gear bike, experiment with it:


A small gear on the engine (or pedals), with a large gear on the drive wheel = quick acceleration and lots of low-end power, but not much speed.





Large gear on the engine and small gear on the drive wheel = slower acceleration, but more top speed.





The manufacturers try to find a happy medium, with 4-wheelers/go-karts having more acceleration and less speed (because they're mainly built for off-road use), while street motorcycles have sprockets designed for them to travel at high speeds.|||If both were the same size as the one on the back wheel (and the engine and internal gearing wasn't modded at all), you'd go like a bat out of hell - if you could get going at all. It would very likely stall.





On a stunt sportbike, a common modification is to use a very large sprocket on the back wheel - this allows finer control, and reduced speed (as it isn't necessary in stunting).|||this is calle d'fear ratios', and it has to do w/ the torque the engin puts out and the transfere to the wheel. ever look at a bicycle and see the range of gears? larger in the rear and smaller in the front give more torque/power and reverse give more speed/ less torque.|||Its all about gear ratios. If you made the countershaft sprocket large and the drive sprocket small, the bike would take forever to get up to speed, but would have a top speed of 250mph+.





If they were the same size...you would still move, its just that the wheel would be moving at the same revolutions as the engine ...|||w/ a name like isaac, you should know math, it is a mathematical formula, of how many turns of the motor to turn the wheel one revolution, then the gear box gives you another ratio of turns if both were the same it would be a one to one ratio