How do you measure a bearing
Measuring a skateboard bearing involves determining its inner diameter, outer diameter, and width. Here’s how you can measure a bearing:
1. Width: Measure the thickness of the bearing from one side to the other. This measurement determines the bearing’s profile and how it fits within the wheel hub. Measure in millimeters using a caliper or ruler.
2. Inner Diameter (ID): Use a caliper or ruler to measure the diameter of the central hole in the bearing, which fits onto the skateboard axle. This measurement is typically expressed in millimeters (mm) and is commonly 8mm for skateboard bearings.
3. Outer Diameter (OD): Measure the diameter of the outer edge of the bearing. This measurement indicates the size of the bearing housing within the skateboard wheel. Again, use a caliper or ruler to measure in millimeters.
4. Recording the Measurements:
– Note down the measurements for the inner diameter, outer diameter, and width in millimeters (mm).
– Record the measurements accurately to avoid any errors when searching for replacement bearings.
5. Using a Caliper:
– Open the caliper jaws and place the inner edges around the bearing’s inner ring to measure the inner diameter. Make sure the caliper is snug against the inner ring for an accurate measurement.
– Repeat the process for the outer diameter by placing the caliper jaws around the outer edge of the bearing.
– Finally, measure the width of the bearing by placing the caliper jaws across the bearing’s width, ensuring that they are parallel to each other.
6. Verifying Compatibility:
– Before purchasing replacement bearings, double-check the compatibility of the measured dimensions with your skateboard’s wheels and axles.
– Ensure that the inner diameter matches the size of your skateboard axles, and the outer diameter fits within the wheel hubs without any issues.
– Confirm that the width of the bearing is suitable for the wheel hubs and does not protrude excessively.
7. Comparing with Standard Sizes:
– Compare the recorded measurements with standard skateboard bearing sizes (e.g., 8mm inner diameter, 22mm outer diameter, 7mm width).
– If the measurements closely match the standard sizes, you can be confident that the bearing is compatible with most skateboard wheels and axles.
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By following these steps, you can accurately measure skateboard bearings to ensure compatibility when replacing or upgrading them. Proper measurements are essential for maintaining optimal performance and safety while skateboarding.