Question about 1997 Mercury Grand Marquis
Hello, I can tell you about my 2002 Gran Marquis LSE wheels and tires. On my car which had the 16" Wheels, Mercury wanted a low rider style for all chassis, including Police cars. They used "60" Series tires and when parking mine, the front concrete curb stops would consistently allow the front bumper cover or the air dam underneath the car to hit. ( Partially from the settling of the Air Suspension.) Even snow covered roads would scrap the car bottom. I bumped my tires up to a 65 Series which seemed a good compromise and it helped. A 75 Series may do you good on 15" rims.
I started looking for taller tires to raise the body. I found a good Website in DiscountTires.com, which when you plug in different tires OR rim sizes will give you the Speedo error for a few preset speeds. The site also lists Alternative tire sizes normally used for YOUR car and Level 1, Level 2, wheel upgrades which is tire jargon known to some.
You can get some Speedos Electronically recalculated for the different tires or wheel sizes. Just make sure the new wheels need the same thickness of studs as are on your car. You need to watch the clearance at the front tires' back wheel lip and the inside of the tire by the frame.
You can ask a tire store to pull 1 tire in your size and roll out a few other sizes and stand them side by side to see the difference in height. I hope you have found my solution very helpful in making your choice.
Posted on Mar 25, 2011
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Posted on Jan 02, 2017
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