Who can do math

[Juicyjayocean]

32 tooth sprocket 26 inch wheels 8,101 rpm

 

[Chainlube]

32 tooth sprocket 26 inch wheels 8,101 rpm

All you need to know is the engine sprocket size, use 20 for engine sprocket and 82 for jack shaft in.

Motor and Gear Ratio Guide and Calculator for Vehicles with a Jackshaft - ElectricScooterParts.com

Electric scooter with jackshaft motor and gear ratio guide with gear ratio calculator.

electricscooterparts.com

 

[Juicyjayocean]

I think it's 9 tooth maybe 10

 

[ImpulseRocket]

Most engine side sprockets are 10 tooth. Gear clutch reduction of most new engines is 4.1:1. Your chain drive to the rear wheel is a 3.2:1 reduction. 4.1 x 3.2 = 13.12:1 total gear reduction.

Now you can translate engine rpm to rear axle rpm by dividing the engine rpm by the total gear reduction.

8101/13.13= 617.45 Rpm

From here you need to calculate the tire circumference. Multiply that times the number of revolutions per minute. This will give you a distance covered every minute. From there you just need to do the math to convert whatever distance for every minute into miles per hour.

 

[noah9988]

Speed/Ratio Calculator

* Enter Parameters Below * Motor Speed RPM (example: 8000) * Motor Sprocket Teeth (example: 10) * Wheel Sprocket Teeth (example: 36) * Tire Diameter Inches (example: 26) Speed and Gear Ratio Calculation Results Top Speed: MPH Gear Ratio: :1 Rollout 75% Speed

smolikperformance.com

 

[Nickt919]

Speed is 47.8 if that’s what you’re looking for…
On a 10T countersprocket

 

[Street Ryderz]

32 tooth sprocket 26 inch wheels 8,101 rpm

it's 47.8 mph

 

[Sidewinder Jerry]

(RPM × Wheel Diameter × π)÷(1056 × Total Reduction) = MPH

Engine reduction x Drive reduction = Total Reduction

(82÷20)×(32÷10)=13.12

(8,101×26×π)
÷(1,056×13.12)
=47.7599759688 mph

 

[darwin]

YO pilgrims! Is the wheel diameter 26" including the tire? That is the ?. I say it doesn't so stated math is incorrect. Tires also are different from tire to tire. Air pressure and weight depressing the tire must also be considered to accurately calculate speed.

 

[Sidewinder Jerry]

YO pilgrims! Is the wheel diameter 26" including the tire? That is the ?. I say it doesn't so stated math is incorrect. Tires also are different from tire to tire. Air pressure and weight depressing the tire must also be considered to accurately calculate speed.

My Kendra 838's is 26.25" when fully inflated in my top gear at 7000 rpm the difference in speed between 26" and 26.25" is only about 1/3 mph. So the difference is not significant enough to really matter.