Will 15 inch rims fit onto a 2000 GMC Sierra?
They will usually not fit. They will not fit around the front
brake caliper. However, I have 15" rims mounted on my 2000 GMC
Sierra. I had to add a wheel spacer and I got away with it by using
the following rims:
Cragar Soft 8 397 Series
Wheel Diameter 15 in.
Wheel Width (in) 8.000 in.
Backspacing (in) 4.000 in.
Offset -12.00mm
You may also want to grind away part of your caliper. Just don't
go too crazy, for obvious reasons.
Here's a link to the rims I used from Summitracing: