Here's why:
* Speedometer Inaccuracy: The larger diameter of the 15-inch setup means your speedometer will read slower than your actual speed. This is because the speedometer relies on the wheel rotation to calculate speed.
* Odometer Inaccuracy: Similarly, your odometer will under-report the distance traveled.
* Potential Transmission Strain (Long-Term): The change in tire diameter alters the gear ratios effectively. The engine might be revving higher than intended at a given speed, potentially leading to increased wear and tear on the transmission over time. This is particularly true if the difference in diameter is significant. In this case (1 inch difference), it may not be a huge issue, but it's still a factor.
* Possible rubbing: The larger diameter might cause the tires to rub against the wheel wells, suspension components, or bodywork, especially during turning or when the suspension compresses.
* ABS and Traction Control Issues: The change in wheel speed can affect the functionality of your ABS and traction control systems, as they rely on accurate wheel speed information.
In short: While it probably won't instantly break your transmission, using 15-inch wheels on a car designed for 14-inch wheels is not recommended. The long-term effects on your transmission, speedometer accuracy, and other vehicle systems can be significant. It's best to stick with the manufacturer's recommended wheel and tire sizes.
