I upgrade my rotors to the Z1 two piece set about 1-2k miles ago, and today I noticed there is a groove being cut into the rotor on the driver side only.
I've attached some pictures of both sides to compare.
I was hoping someone might have an idea what's causing this, and if I should address it, and how?
Thanks in advance for any help you guys can provide.
Driver side:
Passenger Side:
