A tire shop will be the best one to answer there are many aspects offset, tire size etc
18 gallons (approx.) per Buick
The size of rims for a 1998 Buick car is 15x6 inches on the front and rear tires. The spare tire is a 15x4 inch rim, because of the compact size and temporary use.
225/60/17 seems to be the commonly accepted size.
Im the one who asked the question
The biggest rim size that can fit on a Saturn sc is size 22 inch
I would say the biggest size rims you should put on a 1994 Chrysler Fifth Avenue or a New Yorker would be 20 inch rims.
get a tape or look at your tire ,the last # is your wheel side in inch
34 mm (or 1 5/16")
18's are the biggest
40" was the biggest. Now it's 50" - see here http://www.examiner.com/x-4824-Tampa-Sports-Car-Examiner~y2010m1d27-Biggest-rims-in-the-world-Cutlass-on-50s
You have to buy the rims from GM and the biggest size is 22'' rims more then that you will damage your Avalanches' chassis.
They have a deville on YouTube with 28s on it