Measuring wheel offset using a tape measure requires a precise and methodical approach. Here's how to do it:
Steps to Measure Wheel Offset
To accurately measure wheel offset, you'll need to follow these steps, as outlined in the reference:
- Remove the Wheel: Start by taking the wheel completely off your vehicle. This allows for easier access and more accurate measurements.
- Measure the Wheel Width: Use the tape measure to determine the total width of the wheel. Ensure you're measuring from the outside edge of one bead to the outside edge of the other bead where the tire sits, not just the rim itself. Record this measurement.
- Find the Centerline: Divide the wheel width by two to determine the exact centerline of the wheel. This is the imaginary line that runs directly through the middle of the wheel's width.
- Measure to the Mounting Hub: Place the end of your tape measure on the wheel's centerline, and then measure the distance from this point to the mounting hub (the flat surface that makes contact with the brake rotor). Record this measurement in millimeters.
Understanding Offset
The measurement obtained from the centerline to the mounting hub is your wheel offset. Here’s what it means:
- Positive Offset: If the mounting hub is located towards the outside of the wheel, then you have a positive offset. This is the most common type of wheel offset, causing the wheel to sit tucked in closer to the vehicle.
- Zero Offset: If the mounting hub is located exactly at the wheel's centerline, then you have zero offset.
- Negative Offset: If the mounting hub is located towards the inside of the wheel, you have a negative offset. This causes the wheel to sit further out from the vehicle.
Example
Let's say you measure your wheel's width to be 200mm, making the centerline 100mm from each bead. When you measure from the centerline to the mounting hub, you find it’s 60mm. This wheel would have a positive offset of 60mm.
Why is Measuring Offset Important?
Accurately measuring wheel offset is crucial for:
- Ensuring proper fitment of new wheels
- Avoiding clearance issues with suspension components or fenders
- Maintaining desired handling characteristics
By carefully following the steps outlined using a tape measure, you can accurately determine the offset of your wheel and make informed decisions when selecting new wheels.
