What kind of issues can I run into running a wheel set with 5.29 backspacing. Got a nice set that are 17x8 ET20. When I plug it into the calculator it tells me 5.29 backspacing.

 

I have no idea what calculator you are using, but 5.29 backspace (I assume that's inches) on an 8" wide wheel is about one inch of positive offset. That pushes the tires to the inboard side of the wheel well by an inch. On a RWD Olds, you typically want close to zero offset. For an 8" wide wheel, zero offset translates to 4.25" to 4.5" of backspace, depending on the specific contour of the lip of the wheel.

 

I having been researching this for a few weeks and a lot of threads that go over what I am doing in the Chevelle forums call for 5.5". I found a couple threads on here calling for 5.5". I used the tiresize.com calculator to compare what was on the car to what is going on the car.

Before I get flamed, I wanted a set of CCW LM20 wheels but I cant afford those right now so these BBS wheels will do for now. I am going to change the tire sizes but these are the tires that came with the 2-piece wheelset I picked up. I am tired of the 275/6015 on the rears which required me to get air shocks to stop rubbing..they are just too tall. I am going to just put these 2 piece wheels on and go with Blistein all around. I want to go with a 275/40 all around

The specs on these wheels are as follows:

F: 5x120 ET20 17x8



R: 5x120 ET20 17x9




FRONT




REAR