[chadls76]

I am having adapters made for the bolt pattern but what about the width??? The width of the rim is 8.5". The tire is 245/40r18. The adapters are 3/4 inch thick.

 

[MoistCabbage]

Those tires would be 1.5 inches too small in overall diameter.

As far as I can tell, offset requirement is the same between the two cars, meaning the adapters would make the wheels stick too far out. But don't quote me on that, I'm going off of offset listing I found with a Google search.

 

[chadls76]

So I won't be able to do it then?

 

[MoistCabbage]

Someone will have to confirm the offset for the CTS rims. The Devilles original rims are +40. Most high positive offset rims will work.

If the rims fit, you'll need tires.

 

[cadilaker]

I agree its smaller, surely it will fit. But why do such thing?

 

[Submariner409]

For the same reasons I put Buick Rallye wheels on my '65 Chevelle, Cragars on a Cougar, Baby Moons on a '49 Merc and black lug nuts and center caps on my STS - it's his car and he wants it to be a tad "different".

BUT, there are a lot better GM wheels, not requiring adapters, that will bolt right on. Some of the later Deville and "DTS" 18s, for example.

www.wheelcollision.com - click the small pictures for a zoom. His wheel is a "high positive offset" type, about 45 - 47 mm.

The reason to keep the same (within 0.25") original outside diameter of the tires is to prevent speedo and engine management errors. Original size on the driver's door sticker, wheel specs in www.tirerack.com.

 

[Submariner409]

chadls76,Your question on the HVAC blower motor was moved to Deville.