Need help on rear wheel noise

I recently lowered my 2003 base acura and put some aftermarket 18"wheels on it. I'm relatively new to this but the front tires are 205/40 and ride great but my back tires are 225/40 and they make a sound like rubbing when I hit bumps at higher speeds and they make the same noise turning wide. It looks like there's room to me but I don't know if I need spacers or if they just won't fit. Any help? Thanks
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