I have a doubt. Since I am not good with the calculation stuff I thought I will clarify from the experts. I used to drive on 205/55/15 from the stock 195/60/15. I lost 5 mm of GC. I now run on 215/45/17. How much have I gained in mm from 205/55/15. What would be the height increase in mm. Just cos I'm planning to lower my car by 35mm So was in doubt to know how much I gained by the 17 inch and how much I can afford to lower.