What Dan said. Rim width measurement is between the bead seats, not overall. Confirm that's where you're measuring the width. 15x5.5 rims were optional on a '53-55.2 3100's. Standard rims on '56 3100's were 15x5. Later years used the same rim dimensions, but the hubcaps fit over the bumps on the inner ring like Dan mentioned. The 6x5.5 bolt pattern was used pretty much throughout the 1/2 tons into the 70's.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.