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C7 Z51 Tires, difference between 89Y and 93Y

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Old 07-28-2015, 02:39 PM
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alsalves1
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Default C7 Z51 Tires, difference between 89Y and 93Y

Hey guys, i don't know much about tires. I am getting new tires for my 2015 C7 Z51 and the stock ones i have are 89Y and the new ones i am getting are 93Y, i know the Y stands for 186mph but will it impact the way it drive, will it driver differently? i wanted non Run-Flats and they only come 93Y
Old 07-28-2015, 03:29 PM
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Zymurgy
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The numbers 89 and 93 are the load index. Higher number means it is rated to carry a higher load. Read more here: http://www.tirerack.com/tires/tirete....jsp?techid=35
Old 07-28-2015, 03:42 PM
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Originally Posted by alsalves1
Hey guys, i don't know much about tires. I am getting new tires for my 2015 C7 Z51 and the stock ones i have are 89Y and the new ones i am getting are 93Y, i know the Y stands for 186mph but will it impact the way it drive, will it driver differently? i wanted non Run-Flats and they only come 93Y
Odd. I had a rear replaced today on a Z51 and I'm almost certain it was 95Y. I'll look later to confirm.
Old 07-28-2015, 03:59 PM
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Originally Posted by FLS2K
Odd. I had a rear replaced today on a Z51 and I'm almost certain it was 95Y. I'll look later to confirm.
Michelin OEMs for Z51 are 89Y front, 95Y rear.
Old 07-29-2015, 10:31 PM
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Originally Posted by Zymurgy
Michelin OEMs for Z51 are 89Y front, 95Y rear.
Ha, just returned from my garage and was about to post that.
Old 07-29-2015, 11:42 PM
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Thanks for the explanation on how to read the info on tires.
Old 07-29-2015, 11:52 PM
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Originally Posted by alsalves1
Hey guys, i don't know much about tires. I am getting new tires for my 2015 C7 Z51 and the stock ones i have are 89Y and the new ones i am getting are 93Y, i know the Y stands for 186mph but will it impact the way it drive, will it driver differently? i wanted non Run-Flats and they only come 93Y
The OEM tires are (Y) rated at 186+ MPH, not Y rated at 186 MPH.
Old 10-10-2018, 11:20 AM
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maf01
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Hey guys,

I have to replace my tires for the first time.

Going with 93Y for the front wont affect the ride at all? Looking online I see that 89Y are significantly more expensive than the 93Ys.

Any help would be very much appreciated as I want to stick with Michelin Pilot Super Sports and I don't want to buy the wrong kind!

Thanks
Old 10-10-2018, 11:27 AM
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Michelin engineered a PSS ZP specifically for the C7 with a particular rubber compound. I'd stick with w/ OEM, which is 89Y in front and 95Y in the rear because that tells you it's the C7 version of the PSS ZP. It's not so much the load-rating that's a consideration, it's that I'd rather have the tire designed specifically for the car. Other versions of the PSS were either manufactured as OEM for other vehicles or are generic.

You'll see on some tire charts designations for the manufacturer, indicating it's OEM to a particular vehicle or manufacturer. The same tire in the same size often comes without a manufacturer name tagged to it.

Last edited by Foosh; 10-10-2018 at 11:28 AM.
Old 10-10-2018, 05:59 PM
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Gearhead Jim
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Originally Posted by Foosh
Michelin engineered a PSS ZP specifically for the C7 with a particular rubber compound. I'd stick with w/ OEM, which is 89Y in front and 95Y in the rear because that tells you it's the C7 version of the PSS ZP. It's not so much the load-rating that's a consideration, it's that I'd rather have the tire designed specifically for the car. Other versions of the PSS were either manufactured as OEM for other vehicles or are generic.

You'll see on some tire charts designations for the manufacturer, indicating it's OEM to a particular vehicle or manufacturer. The same tire in the same size often comes without a manufacturer name tagged to it.
There is indeed a GM code on the sidewalls of the factory C7 tires.
IIRC, the code is three letters with the middle letter being larger than the other two. I posted the codes from mine (front & rear are different) in a thread here within the last year.
It's unlikely that Michelin is making a PSS ZP in the C7 sizes that's not identical to the factory tires, but I believe in "trust but verify".

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