I was not aware that the GS-D3 came in a non-F1 desigination. Every GS-D3 that I have purchased since 1/05, 2 fronts & 4 rears, have had the F1 desigination on them, F1 GS-D3.
Don't ask why twice as many rears as fronts.
There was nothing wrong with the tires a in mfging defects.
Tom