Hi,have a 1969 deville calipers and drums, i want to put 18" wheels. Any one know off hand what offset/backspacing i'll need .I know 5x5 bolt. I heard -6. any help thank:)s pat:)

It depends on the width of the wheel. The numbers below are for 90s B bodys, but should get you close. Of course, you probably can't go super wide in the rear.

Front:
18X8 / 4.5BS
18X8.5 / 5.0BS
18X9.0 / 5.5BS
18X9.5 / 6.0BS

Rear:
18X8 / 4.0 BS
18X8.5 / 4.5 BS
18X9 / 5.0 BS
18X9.5 / 5.5BS
18X10 / 6.0BS
18X10.5 / 6.5BS

On my 95 SS, I run 18x8.5 in front, and 18x10 in the rear. With 275 40 and 295 35 tires. For your car, an 18x9 all the way around would probably be a good choice. What are you thinking about for tires?

I'm going to put 245/50r/18. thanks for reply. Tryed search for hours. thanks pat

Just as Jayo posted!

What style were you looking at?

Just make sure they clear the rear fenderskirts :thumbsup:

With the 245, use a 8.5 wheel. You will have no problem fitting that in. It will be shorter than the stock tire by a bit...

235/50/18 gives you a nice sidewall.