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Back when I was exploring the g35 forums I saw many g35 owners with SF Challenge. Do they not fit the g37 anymore? Sorry, I don't know too much about the wheels and offset of the sf challenge and g37.
i think the bolt patterns are the same for the 35 and 37. the only thing is the offset. if they make an offset of like 40 or something, it should fit. do not take my word for it, tho. our stock offset is like 35, if i remember correctly.
Biggest size for the SF is 19. With the fender setup on the G37's being so much different than the G35, I don't see a lot of G37's looking good with 19's in the future.