One of my co-workers got a PT cruiser but got aftermaket rims and is willing to sell me the stock tires. I need new tires for the winter when i take off the 17"s and put the steelies back on. But here's the deal, the tires are 195/65/15. Stock is 205/60/15. I checked the tire size calculator and it said if the speedo says 60 I'm actually goin 60.7. Is this a big deal? Do I need to be concerned about anything else?