What speedometer gears do I need?
What gears should I get?
- Count the teeth on the speedometer drive gear.
- Find the gear ratio for the drive axle.
- Calculate tire revolutions per mile.
- Calculate the required tooth count for the driven gear.
- Get the Driven Gear (for your transmission) with the closest tooth count to your calculations.
How do you calculate Speedo gear?
How to calculate the number of teeth on speedometer drive gear?
- Divide the number 20168 by the diameter of the tire to find the number of revolutions per mile.
- Multiply the revolutions with axle ratio, A .
- Divide the product with 1001 .
- Multiply the gear ratio with the number of teeth on the driven gear, N .
How far off is my speedometer with bigger tires?
You might ask: do bigger tires make your speedometer faster? The answer is no. Tire size and speedometer accuracy are directly linked to each other. Up-sizing, or installing a taller tire, will lead to a speedometer reading that is slower than your actual speed.
How do I slow down my speedometer?
“If you need to slow down the speedometer, you need more teeth on the driven gear.” For example, if your speedometer is showing 60 mph and it should be showing 52 mph, you will need to use a driven gear with more teeth to spin the speedometer cable slower. In this case, you need to add three teeth.
How do you recalibrate a speedometer for larger tires?
Press and hold the calibration button located on the speedometer, start the vehicle, and then release the button. Press that button again and then take the test drive. Once you have driven the distance needed, press the button once more and the speedometer will calibrate itself to accommodate the new tire size.
Do bigger tires make your speedometer faster or slower?
Does bigger wheels affect speedometer?
Problems With Tire and Wheel Size Changes One of the most common problems a change in your tire and wheel size can cause is an inaccurate speedometer. A larger tire has a higher circumference and fewer rotations as you roll along the highway. Because the tires rotate slower, the speedometer reads this as a lower speed.
How do you calibrate a speedometer after changing gear ratio?
Can a motorcycle speedometer be calibrated?
And some bikes can have the speedometer recalibrated by an ECU re-flash. Your CBR1000RR C-ABS is a bit of an anomaly, however, as it retains the countershaft speed sensor of the standard model to measure speed. Here you could install a SpeedoHealer or similar device with no worries of affecting the bike’s ABS.
Do bigger tires affect gear ratio?
When changing gears for taller tires, you are heading to a numerically higher gear ratio. The higher the gear ratio, the smaller the pinion gear.
How do you calibrate a speedometer after changing gears?
Will changing wheel size affect speedometer?
Do oversized tires change speedometer?
How far off will my speedometer with bigger tires?