Table of Contents
How are trailer hubs measured?
Cargo and utility trailers with 5 lug hubs are commonly found 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. The second specification to determine is the Inner and Outer bearing size.
How do I know what size my hub is?
Place a tape measure across the face of the exposed wheel hub, which it protrudes out from the center of the drum brake assembly. Take the measurement across the front of the hub, which is the diameter of the hub. Make sure your tape measure intersects the center of the hub. Write your measurement down.
How do you match a trailer hub?
The numbers on the back of a trailer bearing correspond to a certain spindle size, and this is the easiest way to determine the correct hub. If a number is not legible on the bearing then you will need a micrometer to measure the inside dimension of the bearing.
How do I know what size bearing I need for my trailer?
What Size are My Trailer Wheel Bearings? Support your trailer with a jack. Take off the wheel and tire. Remove the grease cap, cotter pin, and washer. Remove the spindle nut. Take out the hub itself. Look for the part numbers on the inner and outer bearings to determine the correct trailer wheel bearing sizes.
What size bearing does a 3500 lb axle?
3500 lb axles have the most common and most consistent spindle sizes. They are typically 1.73 inches at the seal, 1.38 inches at the inner bearing and 1.06 inches at the outer bearing like # TRU24FR.
How do you measure a wheel for a hub?
On a thru-axle hub, measure from end cap to end cap. Enter the width on the worksheet. Divide overall hub width by two to find the center of the hub. Now, measure from the middle of the right flange to the face of the right side locknut.
What is the hub bore size?
The outer diameter is the hub bore, while the inner diameter is the diameter of the vehicle hub itself. For example: a hub-centric ring size of 73-67.1 would mean that the wheel center bore is 73 mm wide and the vehicle hub is 67.1 mm wide.
How do I know what size bearings I need?
It is sometimes necessary to measure bearings to determine the correct bearing type. You can measure the dimensions of a bearing by using a vernier calliper like the one below or measuring accurately with a ruler. All bearings will have a width, an inner diameter and an outside diameter.
How much play should a trailer wheel bearing have?
For adequate trailer wheel bearing maintenance, you need to check your bearings on a regular basis. Jack up the trailer and secure it on adequate capacity jack stands. Check wheels for side-to-side looseness – There should be a very slight amount of play in the wheel, typically 1/8-inch or less.
How do you measure bearing buddies?
What is a Bearing Buddy® Bra? Remove the dust cap and measure it’s outside diameter. Measure the inside diameter of the HUB. We recommend using a caliper or a micrometer to get a precise measurement. Using our Size Gauge Card: The card can be used to select a Bearing Buddy® model based on the size of your dust cap.
What does Hubface mean?
Hub face is measured from the base of one wheel stud to the base of the wheel stud on the opposite side of the axle. The spring center is the approximate width of your trailer. It is measured from the center of the spring seat on one side of axle to the center of the spring seat on the other side of the axle.
How much weight can a 5 lug axle carry?
Technically, a trailer rated for 10,000 lbs can have 5 lug hubs. They are most common on 3,500 lb axles but can be used on the rare 4,000 lb axles as well. You could have a gooseneck or 5th wheel trailer with the 10,000 lb capacity and tandem axle 5 lug axles because the tongue weight can carry the rest.
Are all 3500 lb axle bearings the same?
Expert Reply: In almost all cases 3,500 lb axles will all use the same bearings.
Does spoke length have to be exact?
In essence, you will want to be pretty precise. 2mm too long might just be ok, 2mm short might be too short. Be sure to measure the ERD yourself (!) and as precise as you are able to.
Is hub bore and center bore the same?
Bolt patterns can be 4-, 5-, 6-, or 8-lug holes. A bolt circle of 4×100 means the lug pattern is 4 on a circle with a diameter of 100mm. Center bore is the hole at the middle of the wheel on the hub of the car. Hub rings ensures that there are no fitment issues between wheels and hubs when fitting with each other.
