here is the link below.
I was replying to a 2019 query by Philippe Junneau about "backspace" on 16" Chevrolet wheels.
Photo in question is a 1943 Kelsey 16" wheel from a Ford CMP.
Recently on Facebook a question was asked about wheel offset on CMP trucks and I used the same photo and dimensions to obtain the offset.
As we all measure things differently, here is how I measured the PCD of the wheel mounting studs:
Put the ruler exactly on 10" on the edge of the hole on the centre line to get a sharp starting point. corresponding position on opposite hole is at 20-13/16" -10" = 10-13/16" Even allowing for minor discrepancies it is neither 10-3/4" nor 10-7/8" Holes are not flogged out of round either to affect the measurement.
Hope this clears the confusion.
http://www.mapleleafup.net/forums/sh...ad.php?t=29968
Cheers,