OEM vs Aftermarket Pilot Sport 4S- R vs ZR?

Off-Ramp
1

Question for the tire junkies- I just got Pilot Sport 4s’s on my 2020 M340i. Love how they feel, but noticed that the front’s are R19’s and the rear ZR19’s. My receipt says I bought the R19. As far as I can tell, the R is OEM and ZR aftermarket. Is that worth having America’s Tire swap out the rear’s for the R’s? The ZR’s are more expensive and have a higher tread warranty.

I’m not tracking my car at all if that matters.

2

The ‘R’ means nothing other than it’s a radial tire like basically every tire in modern times

The ‘Z’ is just your speed rating.

Sometimes the speed rating is before the R and sometimes it’s after the wheel diameter and load rating.

3

I thought that originally, but the front and back both have Y speed ratings.