Hello All,

What is the difference between 235/45WR17 and 235/45ZR17?. I ordered Avon Tech M550 A/S 'WR' on tirerack and they sent 'ZR'.

Are they both the same or do I have to sent them back? I ordered for all season and the tirerack sticker says on the tires I got as all seasons

thanks,
RCil

 

Thats the speed rating for the tire.The following is the top speed rating for various types of tire. On an A4 the VR is perfect as long as you keep it under 149mph which should be no problem right? i.e. i got WR's because my S4 isnt limited till 155. But A4's are limited at 135 i believe

M 81 mph 130 km/h
N 87 mph 140km/h Temporary Spare Tires
P 93 mph 150 km/h
Q 99 mph 160 km/h Studless & Studdable Winter Tires
R 106 mph 170 km/h H.D. Light Truck Tires
S 112 mph 180 km/h Family Sedans & Vans
T 118 mph 190 km/h Family Sedans & Vans
U 124 mph 200 km/h
H 130 mph 210 km/h Sport Sedans & Coupes
V 149 mph 240 km/h Sport Sedans, Coupes & Sports Cars
W 168 mph 270 km/h Exotic Sports Cars
Y 186 mph 300 km/h Exotic Sports Cars