i guess is good for occasionally spirited drive.
even the V12 and BF G Force is rated ZR
Let's go further into this speed rating as now you have mentioned ZR and may have confused bro. andrew.
Have posted before in another post.
Q = 99 MPH, 160km/h
S = 112 MPH, 180km/h
T = 118 MPH, 190km/h
U = 124 MPH, 200km/h
H = 130 MPH, 210km/h
V = 149 MPH, 240km/h
Z = 149 MPH, 240km/h and over
W = 168 MPH, 270km/h
Y = 186 MPH, 300km/h
The letters denotes the maximum speed of the tyres. We do have S & T rating for the smaller sizes.
Common speed rating that we have are H and V.
In the past the maximum speed rating was Z, and that was over 240km/h, but as cars can go faster and faster new speed rating was required. But having gone to the last letter Z, they have to go backwards but may confuse the whole rating system, therefore after V which is written as 215/65/R15 96V, for those above V rating, like W and Y it is written as 215/45/ZR17 91W or 215/45/ZR17 91Y.
The Z will be added to the R and followed by W or Y with the load number.