I'm sorry another 2gen Trans Am wheel fitment question

[Dogman691]

I have a 75 Trans Am that I have DSE 2" front and rear drop springs on the car. I plan on putting 18x8.5 f and 18x9.5r on my car. My question is I found a set a wheels I like but the fronts are listed +17offset w 5.6 bs and the rears are listed as +20 offset with 6.04 bs. I'll be running a 245/40r18f and a 275/35r18 in the rear. Does this sound like I'm going to have rubbing issues with the springs or fenders? Any and all help is appreciated... I know the 1st and 2nd gen are little different so I'd like to get it right.

[astroracer]

These are 8.5" and 9.5" wheels? If so, zero offset on the fronts would be a 4.75" BS. Adding the 17mm (.67") offset adds up to a 5.42 BS.
Zero offset for the rears would be 5.25". Adding the 20mm (.79") offset makes a BS of 6.04". Have them check their numbers on the fronts.
You should do some measuring on your car to make sure these will fit. The 275's will have an approximate cross-section of 11.0". With these wheels you should have at least 6.75" at the closest point from the spring to the wheel mouting face. For the outside drop a plumb from the inner lip and measure to the wheel mounting face. You will want at least 5.50" there.
These are considered negative offset wheels as they move the wheel/tire toward the center of vehicle, away from the out fender.
Mark

[Dogman691]

Thanks Mark for the info. So I'm taking its not the best fitment for my car. And you where correct on you measurements I did double check with the suppliers. Thanks for your help I appreciate it.

[astroracer]

Thanks Mark for the info. So I'm taking its not the best fitment for my car. And you where correct on you measurements I did double check with the suppliers. Thanks for your help I appreciate it.

I can't say whether they will fit okay or not. You need to do some measuring to verify.
Mark

[Dogman691]

Ok I'll get it on the lift and do some measurements today and hope for the best.

[astroracer]

Having it on a lift may sway your numbers. If this is a stock '75 pay attention to the seal belt bulge in the inner wheel well. This will be your closest point. Not the leaf spring.