Is it possible to only need to replace one rotor?

Yes, it is possible to only replace one rotor, especially if the other rotor is still in good condition and has sufficient thickness or is not exhibiting signs of wear. However, it's generally recommended to replace both rotors at the same time to ensure even braking performance and to avoid uneven wear, which can lead to issues down the line. Additionally, replacing both can help maintain balance and improve overall vehicle safety.