CORRECTION: my mistake, this is a BBP 7&1/4 going to SBP 8&3/4 and unfortunately spacers ain't allowed in the class. I will measure the SBP 15 x 7 wheels that I have, the backspace & post it later but it is deep. RR
The SBP 8 3/4 should still be wider, but not by much. The BBP 7 1/4 should be 56.75” from wheel mounting surface to wheel mounting surface, the SBP 8 3/4 will be 57 1/8” WMS-WMS.
