I just bought a new tj, and the first thing i did before i even bought it was look at the build sheet. And saw on there it was optioned with 30” tires stock. And i was excited and it has 30” tires on it. But after a couple weeks of driving, i realize the speedometer is 3-4 mph off, and the little sticker in the doorjam says the tire size is 225/75r/15. So did jeep just not change anything not even the speedo gear and just throw bigger tires on it? Im just confused, is this the case with anyone else?