How to Select Replacement Hubs to Fit on Existing Spindles  

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A new hub can be fitted to an axle's spindles if the new hub uses the same set of bearings as the original hub. In the popular 5-on-4-1/2 trailer wheel bolt pattern we have both idler hubs, and hub/drums for brake-equipped trailers, shown on the linked page. The new hubs also must be rated to match the axle's weight capacity, so for example, a 2000-lb trailer axle will use hubs that are each rated for 1000-lbs.

I recommend replacing your entire axle with a new trailer-specific axle and hub kit. This will eliminate any doubts about weight capacity and compatibility. It also means you should not have to worry about parts wearing out any time soon. The other link provided displays all complete axle kits, some of which include hubs and/or brakes.

We also offer Timbren axle-less suspension kits that are ideal for trailer fabricators since they bolt (or weld) directly to the trailer frame. These eliminate the axle beam completely and this can give you improved ground clearance. For instance, Timbren kit # A35RS545 is rated for 3500-lbs (in other words it handles the same trailer load as a beam axle rated for 3500-lbs). This includes 5-on-4-1/2 idler hubs that comes with bearings, races and grease seals.

Trailer axles and wheels do differ from car axles and wheels. The main difference in wheels is the offset; trailer wheels usually have no offset. Positive offset means the tire tread center is closer to the trailer; negative offset means it is further away from the trailer. Trailer wheels are also designed to handle vertical loads more than they are designed for cornering turns.

expert reply by: Adam R

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