JerseyBoy201 wrote:BamaCoupe wrote:Hope you're mistaken or typed it wrong; you need to be running 235/45/18 tires. Now your speedometer will be wrong, and worse your odometer will be rolling thorough the miles faster. As in your trip may have been 90 miles, but your odometer rolled over 100 miles. For resale purposes that's very bad.
Never heard of that before please explain more lol everyone runs with a lower sidewall mostly 40 or 35 whats the problem with that how does mess up ur speedometer
Sorry for the late response; your odometer and speedometer are calculations made from the count of revolutions your wheel/tire make. Per the OEM setup the tire O.D. (outside diameter) is 26.3" and a 235/40-18 O.D. is 25.4"; that means that in a mile the OEM size should make 767 revolutions, but a 235/40-18 will make 794 revolutions. 767x100=76,700 is the revolutions made on OEM in a 100 mile trip; 794x100=79,400 on 235/40-18's. 79,400-76,700=2,700 additional rev's; 2,700/767=3.52021 additional miles that rolled over onto your odometer. That doesn't sound like much, but say you own the car for 40,000-60,000 miles that will add up. You can go lower in sidewall but you better go higher in wheel diameter too; increasing wheel diameter is how "everyone runs with a lower sidewall mostly 40 or 35, but on 18" wheels you need to stick with 235/45-18's"