When we first bought the 98 SL for our son it originally had it's standard 14" steel rims along with 2 different sizes of tires made by 3 different manufacturers mounted on them meaning it handled like crud. I went to the salvage yard and picked up a set of factory aluminum 15" rims off another Saturn, had a matched set of new tires mounted on them which made an improvement but still handled poorly. Eventually I installed new KYB struts on all 4 corners and sent it in for a 4 wheel alignment however almost a year had passed from the time I mounted new tires to the time I replaced the struts and had a 4 wheel alignment and by that time the new tires were pretty much junk due to uneven wear. The alignment technician told me the alignment of the front end and back end were not only a mile off but also opposite of each other which explained why the new tires wore out so quickly.
So my question is this. Before we invest in another set of new tires for the 15" rims, is the alignment specs different when using 15" rims when the car originally was equiped with 14" rims or does it remain the same? I really don't want to invest in a new set of tires and have them wear out quickly again due to alignment issues.