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Old 04-10-2013, 02:16 AM   #1
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Tire speed ratings

So I have stock 245/45 19 Z rated pirellis and hope to add pirelli 275s on the rear but the tires sold on AM are H rated. Will this negatively affect my handling,nvh? Does speed rating use different compounds?
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Old 04-10-2013, 08:19 AM   #2
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"Z" rated tires mean they are good for 186+ mph. Technically Z is not a rating. They're probably "Y" rated, maybe even "W". These higher rates tires are good for certain speeds and generally are made of stickier compounds and have stuffer sidewalls. An "H" rated tire is good for up to 130 mph. Usually made of slightly harder compounds for longer tread life and will have slightly softer sidewalls, meaning more sidewall flex.

H rated tires will have less NVH. I just reread your post and saw that you have stock pirellis which are W rated I believe (168 mph). Choose tires on how fast you plan on driving the car, then look into NVH. Safety over comfort.
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Old 04-10-2013, 08:33 AM   #3
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Quote:
Originally Posted by JayblesStang
So I have stock 245/45 19 Z rated pirellis and hope to add pirelli 275s on the rear but the tires sold on AM are H rated. Will this negatively affect my handling,nvh? Does speed rating use different compounds?
I don't think u should mix different speed rated tires. I'd stay with w's.
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Old 04-10-2013, 11:23 AM   #4
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Let me clarify,

The stock pzero neros say 245/45 ZR 19. So thats what sort or rating?
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Old 04-10-2013, 11:31 AM   #5
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Question two, i see two different p zeros in sizes of 275.
One has the markings of
275 40 R 19 105 H
The other is
275 40 ZR 19 101W M+S

which one is the moneymaker?
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Old 04-10-2013, 11:44 AM   #6
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The 3 digit code is the load rating and the letter is the speed rating, "Z" doesn't really mean anything. Mixing speed ratings may cause your car to handle slightly awkwardly at the limits but it won't really hurt much. I would recommend keeping the same load ratings on all tires but you will be fine (assuming you do not surpass the speed rating of the lower rates tire)
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Old 04-10-2013, 12:22 PM   #7
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Thanks all, will post them up when they are installed
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Old 04-10-2013, 12:45 PM   #8
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A heads up: keep your stockers around if you still have a warranty. Ford can void your warranty with bigger sz tires.
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Old 04-10-2013, 02:40 PM   #9
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Quote:
Originally Posted by GrabberBlue5.0 View Post
"Z" rated tires mean they are good for 186+ mph. Technically Z is not a rating. They're probably "Y" rated, maybe even "W". These higher rates tires are good for certain speeds and generally are made of stickier compounds and have stuffer sidewalls. An "H" rated tire is good for up to 130 mph. Usually made of slightly harder compounds for longer tread life and will have slightly softer sidewalls, meaning more sidewall flex.

H rated tires will have less NVH. I just reread your post and saw that you have stock pirellis which are W rated I believe (168 mph). Choose tires on how fast you plan on driving the car, then look into NVH. Safety over comfort.
Hmmm. My stock pirellies the a/s were hella louder than my Y rated Mickey Thompsons are. They are insanely quiet. Far more bouncy than the pirellies tho. Couple bumps I hit throw me really hard now vs with the pirellies they only threw me a little. My pirellies had almost zero tread tho!
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Old 04-10-2013, 04:11 PM   #10
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A heads up: keep your stockers around if you still have a warranty. Ford can void your warranty with bigger sz tires.
I have never heard that. Can anyone confirm?
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Old 04-10-2013, 06:44 PM   #11
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Quote:
Originally Posted by JayblesStang

I have never heard that. Can anyone confirm?
I was reading it today on s197 fourm about guys dealership approved a new clutch. Ford rep seen 305 tires an different lca's and denied the claim.
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Old 04-10-2013, 06:47 PM   #12
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I was reading it today on s197 fourm about guys dealership approved a new clutch. Ford rep seen 305 tires an different lca's and denied the claim.
Yeah I can believe it. They are going to say you are "abusing" the car.

Why do we buy mustangs if we are not ment to drive them like we stole them.
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Old 04-10-2013, 07:08 PM   #13
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Originally Posted by nosympathy View Post

Hmmm. My stock pirellies the a/s were hella louder than my Y rated Mickey Thompsons are. They are insanely quiet. Far more bouncy than the pirellies tho. Couple bumps I hit throw me really hard now vs with the pirellies they only threw me a little. My pirellies had almost zero tread tho!
Nvh between tire speed ratings is really only comparable within a manufacturers own tires
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Old 04-10-2013, 07:11 PM   #14
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Originally Posted by GrabberBlue5.0 View Post

Nvh between tire speed ratings is really only comparable within a manufacturers own tires
Fair enough! Thanks.
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