This is good info. Thanks. I am bebating on 17s or 18s for my 95 Accord. I've hesistated due to the issue with loss of performance going to 18s. I am considering Axis Mod for 18s but they weight 20.8lbs per wheel, compared to 17.1 for OEM 15s on my car. But the 2x calculations means I am increasing total weight by about 60lbs, for performance comparison. No biggee so I might go 18s. I am also considering Kyowa Racing. Their 18inch KR228 is only 17.4 lbs per wheel.