With all the wealth of information on this site, I have questions about tires. I have about 10,000 miles on my set of Bridgestones. I'm going to visit my son in North Carolina soon. Should I consider replacing the tires before I go? They front still looks great, the back has begun to flatten a little. They both show good thread depth. I've also looked at tire pricing and cost of replacement from dealers in the area. They seem to be on the extreme side on pricing. Any one from the Baton Rouge, La. area have any good references or suggestions?