I wasn't quite sure the exact measurement you were referring to in regards to "diameter of the rim alignment ledge" for the Trailer Idler Hub Assembly for 2,000-lb Axles # AKIHUB-440-2-2K so I took a number of measurements of this hub.
If you take a look at the accompanying photo I made you can see each of the measurements. I have also added a link to a video review of this hub for you to take a look at as well. view full answer...
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