Wheel/Caliper clearance

I just got some new wheels and i test fit one and the caliper clearance is even less than the stock rims, which isnt much. If i had to give a number id say no more than 3mm tops. Is this a problem? Should i get wheel spacers? thanks guys

I believe I've heard that 3mm is fine. But I'm not 100% sure. I'd check out the 3si section on wheels and tires and ask around there, and do a search for your specific rims. Hopefully that will help.