Whats factory backspacing on an 15" rim? 4x1/4 or 4x1/2

Discussion in 'The Bench' started by 72buicklark, Apr 3, 2007.

  1. 72buicklark

    72buicklark AKA 68GS383

    my ralleye 14's have seen better days, so im just bumping it up to 15's but wantto run the EXACT same BS as the original cars that came with the 15's...

    its either 4 1/4 or 4 1/2 just dont know which..
     

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