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Key Concepts. 1. Circumference of a Wheel. The circumference of a wheel is the distance around the wheel. It can be calculated using the formula: C = 2\pi r C =2πr. where C C is the circumference and r r is the radius of the wheel. If you know the diameter (d d) of the wheel, you can also use: C = \pi d C =πd.
So the distance from the center of the wheel to the outside edge of the tire, times 2, times pi (3.14159). Do this calculation for both the old and the new tire. To get the percentage change in the speedometer, take the difference between the old and new distance, divide by the original distance, and multiply the result by 100.
- Overview
- Finding the Center Line
- Calculating the Offset
The wheel offset is simply the distance from a tire’s center line to the hub’s mounting surface. It’s very easy to calculate a vehicle’s wheel offset, but you will need to remove the tire to do it. Knowing the wheel offset is important for ensuring that you purchase compatible tires whenever you want to replace or upgrade them. Whether you’re looking to
for functional or stylistic reasons, it’s crucial to check the wheel offset first.
Place the wheel on the ground with the back side facing up.
If the tire is still on your vehicle, then you will need to
remove the lug nuts and tire
from the vehicle first. First, use a jack or hydraulic lift to get the vehicle off the ground and into a safe position. Then, remove the lug nuts and pull off the tire. Place the tire on the ground with the back of the tire facing upwards.
Make sure to follow general safety precautions for removing a tire from your car. Turn off the car, wear safety glasses, and disable any automatic start features on the vehicle before you begin.
Lay a straight edge ruler across the center of the tire.
Measure from the hub to the bottom of the straight edge.
Next, reposition the ruler or measuring tape so that 1 end is against the hub in the center of the wheel). Position the other end against the straight edge laying flat across the tire.
For example, the distance from the straight edge to the hub might be 172 mm (6.8 in).
Subtract the center line from the hub distance measurement.
The resulting number is your offset. Record or remember this number for future reference.
For example, if you got 172 mm (6.8 in) for the hub and 122 mm (4.8 in) for the center line, then your final number would be 50 mm (2.0 in).
Browse wheel & tire setups here:http://bit.ly/2Imgo9BOn this episode of Wheel School, We go over how to properly measure your wheels. We show you how to meas...
- 4 min
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- Fitment Industries
If the two wheels are front and rear wheel, both distances should be equal. Revolutions specifies, how often the wheel turns around at the covered distance. Radius of a wheel is the span between center and edge, diameter ist twice the radius, the span from edge to opposite edge. Circumference is the distance a wheel covers at one revolution.
Jun 20, 2024 · 2. Lay the tire down on its side to measure wheel diameter manually. If you cannot find a wheel diameter number on your tire's sidewall, measure it yourself. Take the wheel out of your car, then lay it on a flat, smooth surface. A table or an area of ground with no incline works well for measuring tire diameter.
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Apr 14, 2023 · Measure the total width of the wheel, including the tire. Divide that number by 2 to find the centerline. For example, if your wheel and tire together are 10 inches wide, the centerline would be at 5 inches. Subtract the tire protrusion (step 3) from the centerline (step 4) to get your rim offset.
