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These ratings

Speed Rating Miles/Hour Kilometers/Hour
N 87 140
P 93 150
Q 99 160
R 106 170
S 112 180
T 118 190
U 124 200
H 130 210
V 149 240
Z 150+ 240+
W 168 270
Y 186 300
Clarified some info:

TireRack said:
While a Z-speed rating still often appears in the tire size designation of these tires, such as 225/50ZR16 91W, the Z in the size signifies a maximum speed capability in excess of 149 mph, 240 km/h; the W in the service description indicates the tire's 168 mph, 270 km/h maximum speed.

225/50ZR16 in excess of 149 mph, 240 km/h
205/45ZR17 88W 168 mph, 270 km/h
285/35ZR19 99Y
For example, the Eagle F1 tires we have on the SRT4 are 225/45ZR19 92W.

Meaning, those tires can reach "168 mph, 270 km/h" (W) with more load (1389lbs/wheel) than is required by the car.

In other words, those tires a f-in bitch-in'. :D

TireRack has a fine description that should be bookmarked by all.
 

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Toyo Proxies baby....z rated lol 150 + mph... h yeah! whoo hoo lol
 

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These ratings

Speed Rating Miles/Hour Kilometers/Hour
N 87 140
P 93 150
Q 99 160
R 106 170
S 112 180
T 118 190
U 124 200
H 130 210
V 149 240
Z 150+ 240+
W 168 270
Y 186 300
Wow i can rock out 150+ outstanding... now to get my car to be able to reach those speeds.... *looks at Turbo R/T* time to get to work on my daRk/T
 

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Wow i can rock out 150+ outstanding... now to get my car to be able to reach those speeds.... *looks at Turbo R/T* time to get to work on my daRk/T
lol....why you looking at me..lol ive only been to 148 haha
 

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lol....why you looking at me..lol ive only been to 148 haha
cause i need you to turbo my car and then i'll do the rest of the tweeking =)
 

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yay new top speed from VA to KY... some mad long stretches of PoPoless highway...

granite i know someone is going to say it... yes its connected and was in my car when i hit that speed, no i'm not going to hold a video camera dodging traffic at 121mph lol but you all can tll thats my gps from previous pics in my car =)

was all excited when i toped my last one... hahah take care and be safe out there..
 

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Sweet deal dude
Now i need to convert that to KM/h LOL

thats around 194.72 km/h according to google
 

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I hit 165 when my camaro was stock. I raced my girl's dad's C6 vette up to 175.

New build in progress. Hoping to be able to be capable of 200. . .
 

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After the engine is broken in, our black SE achieves roughly 200 km/h (125 mph). Not astonishing but OK for a bulky car of this size and weight.
 
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