Can you replace a tire size 21575r15 with tire size 20565r15?

No, you cannot directly replace a tire size 215/75R15 with 205/65R15 because they have different dimensions. The 215/75R15 tire is wider and has a taller sidewall compared to the 205/65R15, which can affect the vehicle's handling, speedometer accuracy, and overall performance. It's essential to consult your vehicle's specifications or a tire professional to ensure compatibility and safety when changing tire sizes.