Go Kart Drive System Enigma: Tire Size Versus Sprocket Size: What Is The Best Combination?

Question:"I've this go kart and I wish to create the back tires larger. If I alter the diameter of back sprocket so it increases correspondingly with the back tire, will the functioning of the go kart endure? In other words would be the go kart go slower than previously and will the move kart have poor off the line stride?"

Great question, I've frequently thought about myself. I've frequently said that the guideline to get a go kart to possess optimal performance is to get the back sprocket be almost 85 percent of the back wheel diameter. The issue is, does this use only for 12 inch diameter brakes or does this use to 16 inch back wheels also?
The response to this question may surprise you. It amazed me. When I ran through the calculations that a humorous pattern arose:
- A 12 inch diameter bicycle with a 12 inch diameter rear sprocket afforded a rate of 22 mph at 7.3 ft per second squared of speed.
- A 16 inch diameter bicycle with a 16 inch diameter rear sprocket afforded a rate of 22 mph at 7.3 ft per second squared of speed.
I believed that was incorrect so I conducted an entire slew of tires dimensions with corresponding sprocket dimensions and came up with exactly the very same numbers.
So the solution is no. No, your operation won't suffer if you boost your sprocket size with the wheel dimensions.
What is going to happen if you don't boost your sprocket size is the clutch will probably become more loaded and smoke. The go kart will need pushing to begin and may have horrible low end functionality.
But should you increase the width of the sprocket so it is 85 percent of the trunk diameter, then the operation should remain almost constant.
That's an unexpected result, however, one you can rely on in the event that you're designing a go kart from scratch. The rule of thumb stands out:"The back sprocket should be almost 85 percent of their back tire size for optimal speed and acceleration functionality."
The belt drive system by way of instance is very dependent on this connection. The main reason is that the drive pedal to get a belt drive can be very big, 1.75 inches in diameter, and demands the back pulley be as big as you can.
In the instance of the timber go kart which I made, so as to maintain the ratio an easy one to a system (versus including a jack-shaft) the back pulley needed to be the exact same size as the back tire. I managed to make it through this issue by creating a timber pulley that was durable enough to manage street circumstances, inexpensive enough to create myself and finest of all gave the functionality that was required for great acceleration and total speed performance.