looking to switch out stock wheels for 235/75-15 Goodyear Duratracs on  Black Rock Rim (blade series 975). Would like to go with 15x7 with a 4 inch backspace.  We do have a 2 inch lift. Anybody have any experience with Black Rock? And more importantly will there be any issue with tire rub especially with the 4 inch backspace?

 I have Rock Crawler Series 52 wheels with 2.5 back spacing if you have 4" back spacing you will most likely need spacers if you are buying wheels new it is cheaper to just get the correct back spacing than adding spacers. JMO

Thanks for the info........ Our current stock setup is 3.25 and Black Rock does have it in a 3.75 backspace. Do you think we would need spacers with that setup? What would be the maximum backspace allowable without spacers and tire interference? We definitely want to stay with the 235/75-15 duratracs which work best with a 7 inch rim. Finding a wheel in black with correct backspace and in black/ FLAT finish and 7 inch rims is a bit of a challenge.