Early 1928 AR wheels

The area that bolts it to the brake drum is not as deep as the non AR. There were no emergency brake bands on the AR so the wheel was not as deep. Hope that helps.
 
The drums for the AR wheels are also different; the AR drums are the same front and back, only the hubs are different.

If you install the AR wheel on a B wheel it is only supported by the lug nuts, if you install a B wheel on a AR drum it will not seat on the face on the drum. There is a article in the Service Bulletins telling you not to mix AR & B wheels.

Ron
 
Pg 328 Service bulletins
 

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Here are some photos I took. The black wheels are early 28, the red wheels are 29.
 

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Notice the center hub area right behind the hub cap and outer spokes.
The 29 has a smooth rounded transition, while the AR wheel has a distinct line.
 
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