![]() The last method is to remove the bearings from your old hub. Use this measurement and the table shown to determine the bearing sizes required for your axle spindle. The resulting number is the circumference of the spindle. This method involves wrapping the tape around the spindle at the bearing locations. The next method is the use of a flexible tape. Once the diameters are obtained, the table shown can be used to determine the bearing sizes required by your axle spindle. The resulting number is the diameter of the spindle and in turn, the inner diameter of the bearings used in the hub. ![]() Place the caliper at the bearing locations on the spindle. The first method is the use of a digital caliper. Today, we will review three methods of determining the size of axle spindles and in turn, the size of hubs that are used on your trailer. Straight spindles have the same diameter at the bearing locations. You may also have a spindle that looks like this. Tapered spindles require hubs that contain two different-sized bearings. If it looks like this, you have a tapered spindle. After removing the wheel and existing hub, look at the spindle. ![]() Hub sizes are determined by the size and shape of the spindles on your trailer's axle. If you are still not sure of the hub size you need, we will walk you through three methods of determining the spindle type and size on your axle and in turn, the size of hub you will need. Most hubs in use today on marine and recreation trailers fall into one of four capacity sizes: 1250 pounds, one-inch straight spindles, four and five lug or holes 1350 pounds, one and one-sixteenth inch straight spindles, four and five lug or holes 1750 pounds, one and three-eighths inch by one and one-sixteenth inch tapered spindles, five lugs and 3000 pounds, one and three quarters inch by one and one-quarter inch tapered spindles, six lugs. Before buying replacement hubs for your trailer, take some time to ensure you are getting the correct size.
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