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Trailer bearings need to be inspected (Flat spots on bearing rollers, broken cages, or rust and pitting) once a year for wear or damage and a lack of lubrication. It is recommended if the [trailer bearings] are worn to replace the bearings races at the same time the bearings are replaced. Trailers that subjected to extended periods of non-use or submerged in water should have bearings inspected and packed with grease more frequently.

The first specification to determine is the number of studs/bolts and the ‘bolt circle’ diameter. Most 4 lug hubs have a 4” bolt circle and most 5 lug boat trailer hubs have a 4-1/2” bolt circle diameter. Cargo and utility trailers with 5 lug hubs are commonly found bearings with a 5” bolt circle. To correctly measure the bolt circle of a hub, measure from the center of the hub to the center of a stud and multiple that measurement by two.

You can't see these towing components without dismantling your trailer's wheel assembly, but nsk bearings are in there doing you a world of good. They help to provide a smooth towing ride and prevent friction from slowing you down and unnecessarily wearing out your trailer's parts. Without them, heavy loads could grind wheel movement down to a standstill.

First, completely remove the lug nuts and tire, followed by the dust cap or, if you're using one, the bearing protector. You can remove the dust cap by prying it off with the screwdriver, but a protector may require a few light taps with a hammer. To gain access to the bearings, you'll next need to straighten out and remove the cotter pin that holds the castle nut in place. Then remove the castle nut and washer.

Many trailers made by Alko and other manufacuers now use the extra wide series bearings, these have a split inner ring and two rows of ball ntn bearings. One of the most common sizes being 34mm inside X 64mm outside x 37mm wide. If you don\'t have a bearing reference try entering the dimensions in the search box.

KTR 201 45x75

KTR 201 50x80

KTR 201 70x110