Gn Wheel Backspacing

[marred4life]

IM LOOKING ON GETTING MY STOCK WHEELS WIDER UP TO 9" ID WOULD LIKE TO KNOW THE CORRECT BACKSPACING FOR THE WHEELS, IM RUNNING 275/50R15 BFG RADIALS.

 

[MIB]

I have one set of 8's on my GN and the backspacing is 4 1/8 with steel drums. I am using a 275/50 BFG Drag without any clearance problems. I know you are asking for the backspacing of 9's but this should give you an idea.