How wide is the tract of the wheel?

A quick learner says:
The 23-155 looks like what I need but I need to know how wide the tract of the wheel is. That dimension is not given. We need it to be 1/4 or 5/16 across where the rail fits into the wheel.
Profile picture of Paul
Paul from SWISCO responded:

The 23-155 closet door roller features a 9/32" thick wheel with an inside dimension of 5/32". Take a look at the attached picture so that it is clear exactly what the two dimensions are measuring.

Alternate view of 23-155
Alternate view of 23-155

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