I need a person better at this to double check my math. I have the 98 Ranger XLT extcab 2.5L and its stock tires were 205/75/R14. The last owners put the Explorer sport wheels on, Which I like, but the tires are all wrong and throws my speedo off by a lot. They are 245/50/R16. So I did the math to keep these wheels and I came to 205/65/R16 being the closet to which makes my speedo about 1.7% over? Double check this somebody? Thanks!!