When you say scrubbing are you speaking of scrubbing on something with the car itself? If yes then no this is not normal. I'm on my second Treg and have never had this issue with factory size tires. If you mean tire noise on the road then yes depending on tire rubber compound being "harder" should make a little squealing noise at low speed. Remember this is a very heavy vehicle. But when I was running the factory softer rubber I could not hear anything but tires only lasted 30k.