How do you calculate the final drive ratio on a motorcycle?
To determine the final drive ratio, divide the rear sprocket size, say 49 teeth, by the front or countershaft sprocket size, say 13 teeth (like a new Yamaha YZ250F). In this case, the Final Drive Ratio is 3.77 – the front sprocket revolves 3.77 times to make one complete revolution of the rear sprocket.
How do you find the final gear ratio?
By simply dividing the ring gear tooth count by the pinion gear tooth count, the ratio is determined. For example, if we divide a ring gear with 41 teeth by a pinion gear with 10 teeth we find that the gear ratio is 4.10:1 (41/10 = 4.10). Tire diameter will also have an effect on a vehicle’s final drive ratio.
What is the formula for gear ratio using number of teeth?
The gear ratio is calculated by dividing the output speed by the input speed (i= Ws/ We) or by dividing the number of teeth of the driving gear by the number of teeth of the driven gear (i= Ze/ Zs).
How do you calculate sprocket ratio?
Calculating the Sprocket Ratio The sprocket ratio is simply the number of teeth on the driving sprocket (T1) divided by the number of teeth on the driven sprocket (T2). If the front sprocket on a bicycle has 20 teeth and the rear sprocket has 80, the sprocket ratio is 20/80 = 1/4 = 1:4 or simply 4.
How do you determine the number of teeth in gear?
The number of teeth (z). This value is: z = d/m. Module (m). Ratio between the pitch circle in millimeters and the number of teeth.
How to calculate gear ratios on a motorcycle?
Enter gear ratios, primary ratio, sprocket sizes and tire diameter, then drag RPM slider to calculate speed from RPM. Drag Max RPM slider to adjust the range of the RPM and Speedometer Gauges. Check Compare Sprockets and enter alternate sprockets for comparison.
How does gearing affect the final drive of a motorcycle?
The Gearbox – Each gear in the gearbox will have its own ratio, and changing what gear is selected changes the ratio that goes through to the final drive. Final Drive – The ratio between the number of teeth on the front sprocket (the small one) and the rear wheel sprocket.
What is the gear ratio for a 5 tooth sprocket?
This ratio in written form is 2:1. Now let’s assume that you have a 5 tooth front sprocket and a 15 tooth rear sprocket. Now the front sprocket has to rotate three times in order to rotate the rear sprocket once. The gear ratio of this arrangement would be 3:1. To bring it to more familiar ground, here’s a more typical gearing arrangement.
How are gears rated on a motorcycle sprocket?
These gears have a certain number of teeth on them giving them the tooth rating. So you can find the gears with rating on them such as 15T, 18T, 28T, 36T, 48T, etc. This number actually is nothing much the teeth count on that sprocket.
How is the gear ratio on a motorcycle determined?
When we talk about gearing, we’re referring to the final-drive ratio, which you get by dividing the number of teeth on the rear sprocket by the number of teeth on the front, or countershaft sprocket.
What are the gear ratios for a sprocket?
FRONT SPROCKET TEETH <<< FASTER ACCELERATION <<<<<< >>>>>>MORE TOP END SPEED >>> 10 11 12 13 14 15 16 17 18 19 303.00 2.73 2.50 2.31 2.14 2.00 1.88 1.76 1.67 1.58 313.10 2.82 2.58 2.38 2.21 2.07 1.94 1.82 1.72 1.63 323.20 2.91 2.67 2.46 2.29 2.13 2.00 1.88 1.78 1.68 333.30 3.00 2.75 2.54 2.36 2.20 2.06 1.94 1.83 1.74
What is the final drive ratio on a motorcycle?
In our example the Final Drive ratio is the ratio of the final part of the gearing, the ratio between Rear and Front sprocket. This is also referred to as ‘Secondary Ratio’. Below a table containing the possible final drive gearing changes and their results on Speed and Torque.
Can a gear box change the drive ratio?
But if you do, also change the Primary Drive Ratio field in the GC accordingly. The gear box is the only gearing part that can change its ratio very easily and that is by you changing the gear while you drive. Normally a gear box is dedicated for an engine or bike so you do not have to change gear ratio in the gearbox itself.