How do you calculate bicycle gear ratios?
Table of Contents
How do you calculate bicycle gear ratios?
To find this: divide the number of teeth on the chainring by the number of teeth on the sprocket; multiply by the wheel diameter (as with gear inches); then multiply this figure by pi (3.14) and convert to metric.
What is the formula for calculating gear ratio?
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 gear ratio with rpm and speed?
To convert from gear rpm to gear speed in rad/s: multiply gear rpm by π/30.
How do you multiply gear ratios?
For example, for the gear at left the blue gears are 7 and 21 teeth, while the green gears are 9 and 30 teeth. Thus, the first gear ratio is 7:21 and the second is 9:30. Multiplying the two together gives (7×9):(21×30) = 63 : 630, which is 1:10.
What is velocity ratio formula?
The velocity ratio (V.R.) of a machine is the ratio of distance moved by the effort to distance moved by the load. Formula – Velocity Ratio = Distance moved by the effort / Distance moved by the load = y/x. The velocity of given machine can also be determined by assuming the machine to be ideal.
What is the best first gear ratio?
For most street performance applications, a 10:1 final First gear ratio is usually considered optimal. The disadvantage of operating a 4.10:1 axle ratio on the street with a 1:1 high gear is excessive freeway engine speed.
How do you calculate RPM on a bike?
Reduce your counting time and count the number of times your right foot reaches the bottom of the stroke within 15 seconds. Multiply that number by four to calculate your RPM.
Is velocity ratio same as gear ratio?
The reason bicycles are easier to cycle up a hill when the gears are changed is due to what is called Gear Ratio (velocity ratio). Gear ratio can be worked out in the form of numbers and examples are shown below.
How do I choose the best gear ratio?
To find the ideal selection, multiply the final drive ratio by the redline speed in fourth gear (152 mph) and divide that by the top track speed (140 mph). This would yield a theoretical 3.33—which is close enough to the nearest available final drive ratio of 3.36:1.
