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The scrapping is common problem with W-body GM cars. Read complaints on Impala board, and somewhere else.
My Regal also is scrapping sidewalks. I am trying to entering / leaving driveways slow, and at about 45 degree angle to road. Not always possible, but in 90% of cases this helps.
Though, it looks as this does not hurt the cars. Read that the "crapping" part is to deflect the air from under the car nose to engine intake. Made from a durable plastic. And, in the worse case, it does not costs much to replace.
Though, I did not verify the information myself.
The 215/70-R15 tires would be more tall than the original ones. 215/65-R15 lower and more close to the original diameter. I would rather prefer the last ones.
As the rough approximation you can use the chart:
but better to do your own calculations, as explained here:
The OEM 205/70-R15 tires have diameter (15*25.4=381) + (2*0.7*205=287) = 668 mm.
The diameter for 215/70-R15 is 381+(2*0.7*215=301) = 682mm. 2% taller.
With 215/65-R15 it would be 381+(2*0.65*215=279) = 660 mm. 1.1% lower.
Last year replaced tires (with 98 Malibu, not Century) by Firehawk SH-30. Generally, Firestone have not the best reputation, but the SH-30 are real gems!
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