i recently blew a rear tire on my g37, when i bought a new one i bought the 245/40/19 94Y i noticed that the oem one is 94W , is this a concern mixing rear speed rating? since iam not downgrading the speed rating? btw the tires are exactly the same except for the different speed rating

THanks for the help

 

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

I dont know about mixing speed rating, but was your tire pressure ok?