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Difference Between an Idler Hub and a Hub/Drum  

Question:

What is an idler hub and how does it differ from the hubs you describe? Do all trailer hubs have an idler? If not, what is the advantage?

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Expert Reply:

The Dexter Trailer Hub Assembly you referenced, part # AKIHUB-440-2-1K is known as an idler hub. An idler is a hub that is no provisions for trailer brakes. It has no brake drum.

Part # 8-276-5 is an example of a hub/ drum that has a brake drum that can be used with a brake assembly like part # 23-47.

The # AKIHUB-440-2-1K would be an acceptable replacement for an idler hub with a 4-on-4 bolt pattern that uses # L44643 inner and outer wheel bearings.

expert reply by:
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Mike L
Kendra T. profile picture

Kendra T.

2/18/2020

Need drum electric brake kit with L 68149 inner bearing LM12749 outer bearing

ChrisR profile picture
Etrailer Expert

Chris R.

2/19/2020

The LM12749 outer bearing is a bit of an odd duck (0.8656" inner diameter) and unfortunately we don't have a hub assembly that uses it. The best solution I can offer is to simply replace your existing axle(s) with new ones that use a more standard spindle size. This will make replacement parts like hubs and bearings much easier to find. I have copied a link that will take you directly to our full selection.

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