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Old 07-18-2017, 01:22 PM   #1
Kainzo
 
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Had a blow out... tire replacement doesnt match up?

2011 2SS Camaro

I blew out the back right tire and they replaced it with this
245/45R20
https://drive.google.com/open?id=1BM...3SuD93lPbksa1g

This is the back left tire
245/45ZR20
https://drive.google.com/open?id=11w...Sns5Jj3U3NhP1w

For some reason my camaro had 245/45ZR20's on all 4 tires (guessing the dealership went cheap?)
Am I nitpicking here? it seems like a big difference, did they put it on wrong? maybe the tire doesnt fit?
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Old 07-18-2017, 02:14 PM   #2
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was that an OEM tire that GM installed? it was Z rated but new one isn't. quite cheap!
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Old 07-18-2017, 02:17 PM   #3
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Originally Posted by DvKillar View Post
was that an OEM tire that GM installed? it was Z rated but new one isn't. quite cheap!
What exactly is the difference between ZR and R in the 245/45 ?
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Old 07-18-2017, 02:21 PM   #4
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Z speed rated means it can handle higher speeds. R is common to all "R"adial tires. just how the tire is built.
Z rated tires can handle speeds over 149mph. standard tires from factory are S rated to 112 mph.
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Old 07-18-2017, 02:23 PM   #5
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essentially, traction, rubber compound is the difference.
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Old 07-18-2017, 02:35 PM   #6
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Either way, your SS came with 275s on the rear. Speed ratings explained here.
https://www.tirerack.com/tires/tiret....jsp?techid=35
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Old 07-18-2017, 03:24 PM   #7
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I was under the impression that they stopped using the 'Z' rating a while back?

EDIT; according to Tire Rack:

"When Z-speed rated tires were first introduced, they were thought to reflect the highest tire speed rating that would ever be required, in excess of 240 km/h or 149 mph. While Z-speed rated tires are capable of speeds in excess of 149 mph, how far above 149 mph was not identified. That ultimately caused the automotive industry to add W- and Y-speed ratings to identify the tires that meet the needs of vehicles that have extremely high top-speed capabilities."

"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."
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Old 07-18-2017, 03:32 PM   #8
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I guess the issue here is... the used car dealership I bought this from put on 245's all around and I should be using 275/40s on the back.
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Old 07-18-2017, 04:28 PM   #9
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Quote:
Originally Posted by Kainzo View Post
I guess the issue here is... the used car dealership I bought this from put on 245's all around and I should be using 275/40s on the back.
That's right, the 245's are too narrow for the rear rims and that could have contributed to your blowout.

You should be going after them.
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Old 07-18-2017, 04:56 PM   #10
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Quote:
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I guess the issue here is... the used car dealership I bought this from put on 245's all around and I should be using 275/40s on the back.


Yup, I bought a 2SS off a used dealer, it needed tires for the provincial safety, they put 245's on all around, I laughed and said hell no. 275s, or I walk from the deal.

Got a brand new set of staggered tires, Pirellis to boot
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Old 07-18-2017, 05:02 PM   #11
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neither one of those tires look right... angle of picture? rims? maybe its just me...
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Old 07-18-2017, 05:48 PM   #12
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Originally Posted by kmarshall2121 View Post
neither one of those tires look right... angle of picture? rims? maybe its just me...
I agree. Needs more rubber.
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Old 07-18-2017, 05:50 PM   #13
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Just so you know. The rear rims are wider than the fronts, and too wide for 245 tires.

You was robbed.
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Old 07-18-2017, 06:24 PM   #14
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Quote:
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neither one of those tires look right... angle of picture? rims? maybe its just me...
It's because the 9" wide rear wheels are the max-recommended width for 245/45-20 tires, making the fitment a mild 'stretch' up from the measuring width (which is only 8").

There's nothing technically wrong with a max-recommended fitment, and it does offer some advantages (cornering and steering response/precision) to go with the disadvantages. Chief among the disadvantages is that it does not have a "conventional" appearance and it doesn't provide as much scuff protection for the wheel (for many people, in that order of importance).


Keep in mind that at 11" wide, the 5th gen 1LE rear wheels are also a max-recommended width for the tire size fitted (285/35-20's). For a reason . . .


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Last edited by Norm Peterson; 07-19-2017 at 05:47 AM. Reason: bad speling
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