Hi all, for some reason my 2007 Corolla CE came stock with 195-65-15 tires (I bought the car used, so i dont know if it was 195 or 185 from new... the car had 195's on when i bought it) I always just bought 195-65-15 tires and never thought twice. The 2007 Corolla CE was also sold with 185-65-15 tires and I got to thinking about possibly buying a new set of winter tires and I know that a smaller contact patch may provide better winter performance (more weight per square inch). It will result in my speedometer in being 2% faster than speedometer amount or will it? I guess what I am saying is.. if the car came stock with 185 on some and 195 on others, how would I be able to tell what mine is stock with? What do I need to look for? If my car came stock with 185's than 185's should have no impact on the speedo? Stock options were: 195/65/15 89S 6X15 or 185/65/15 86S 5X15 Does anyone know what is meant by 6X15 and 5X15? I know 86 is a lower load rating though. Thoughts and advice please! A) How do I tell what my car came with originally B) Is it worth running narrower tires in winter or should i just go with 195's again?