How To Determine Your Replacement Trailer Hub Size

Trailer Wheel Hubs - Technical Data

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Trailer Parts Superstore® carries a wide selection of high quality cast iron trailer hubs. Whether y'all are replacing your entire hub or re-edifice the old ane, it is very important to apply the proper size replacement parts.

The start specification to make up one's mind is the number of studs/bolts and the 'bolt circle' diameter. About 4 lug hubs have a iv" bolt circle and virtually 5 lug gunkhole trailer hubs accept a 4 ½" bolt circle bore. Cargo and utility trailers with 5 lug hubs are commonly found with a 5" bolt circumvolve. To correctly measure out the bolt circle of a hub, measure from the center of the hub to the center of a stud and multiple that measurement past two.

HUB Just
INNER Begetting
OUTER BEARING
INNER RACE
OUTER RACE
GREASE SEAL
GREASE CAP
STUD
Wheel NUT

The second specification to determine is the Inner and Outer bearing size. Nigh bearings are stamped with a reference number that tin exist used to easily identify its inside diameter (see chart in our bike bearing section).
If the number is not available, the most accurate way to measure the bearing I.D. is with a micrometer. Be certain to check both the inner and outer begetting measurements before ordering. Hub length or bearing distance should likewise exist considered. Some trailer manufacturers, such equally LoadRite, utilise a 'brusk hub' on their 1" & one-1/16" straight axles. The overall hub length is therefore shorter than about other standard boat trailer hubs.

When rebuilding the hub trunk with a new begetting kit remember to supercede the inner and outer races or cups. Even if the cups don't show sign of wearable they should be replaced to maintain proper begetting tolerance. Thoroughly grease the bearings past working grease around rollers then pack the hub interior earlier installing a new grease seal in the back of hub.

Bearing grease quality and compatibility is some other important consideration, especially for boat trailers that are commonly submerged in h2o after a long road haul. Marine trailer bearing grease provides outstanding h2o washout and excellent corrosion protection caused by common salt h2o. It is important to determine compatibility prior to mixing greases of dissimilar base types. Incompatible greases can cause agin chemic reactions, resulting in rust, pitting, scoring of metal, and breakdown of the greases ability to lubricate. The post-obit chart displays compatibility characteristics of various grease types.