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Tire Pressure and Aftermarket Tires

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Old Feb 25, 2010 | 05:39 PM
  #101  
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Spike100
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Originally Posted by AznSky
Although Spike has been very knowledgable when it comes to stuff like this and has given very valuable information in the past.

I'd have to agree with bdblackz since once you change your tires (size, manufacturer, etc.) you'd have to rely on the tire manufacturer's specs instead of Nissan's. Especially since it's the tire pressure labels on the door jam are probably provided by the OE tire manfacturer's themselves.

PS ~ Ross get back to work!
Please understand that I do NOT recommend buying tires intended for street use for the Z that do not meet the car’s manufacturer’s specifications.

For example, if you are considering a tire that requires jacking its recommended pressure to 42 psi for the Z, you are buying the WRONG tire for your car if it’s meant for street use. It’s OK for the track, but all wrong for the street.

--Spike
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Old Feb 25, 2010 | 08:13 PM
  #102  
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Originally Posted by Spike100
Please understand that I do NOT recommend buying tires intended for street use for the Z that do not meet the car’s manufacturer’s specifications.

For example, if you are considering a tire that requires jacking its recommended pressure to 42 psi for the Z, you are buying the WRONG tire for your car if it’s meant for street use. It’s OK for the track, but all wrong for the street.

--Spike
I think it depends on what you are talking about. Load carrying capacity simple indicates whether the tire will safely handle the gross weight on the wheel at the speed it will be operating. If you just consider this, using an XL tire and having to increase pressure to 42psi to match the OE tire load carrying capacity, isn't a problem.

Now, that says nothing about ride comfort and handling. Just because a tire meets the load carrying requirements doesn't mean it would be an "optimal" tire for the car. I certainly wouldn't use an XL tire with a lower load index on my Z, even if I knew I could jack the pressure up.

So, I agree with you in general but for the OP who had an XL tire in the front, he really did need to run it at higher psi to maintain the proper load capacity. But as he admitted, he picked the wrong tire to begin with.
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Old Feb 26, 2010 | 06:35 PM
  #103  
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^^ You are correct. I believe bdblackz makes the same point.

I’ll stay with my message/advice… that you should equip the Z with appropriate tires with the car’s approved load rating. Unless you are carrying a bag of heavy concrete in the hatch, go with the right tires for your Z (instead of some renegade tire that isn’t the right choice).

The discussion about load rating is more appropriately directed towards SUV’s, and not rear wheel drive two-seat sports cars.

--Spike
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Old Feb 27, 2010 | 05:50 AM
  #104  
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Originally Posted by Spike100
^^ You are correct. I believe bdblackz makes the same point.

I’ll stay with my message/advice… that you should equip the Z with appropriate tires with the car’s approved load rating. Unless you are carrying a bag of heavy concrete in the hatch, go with the right tires for your Z (instead of some renegade tire that isn’t the right choice).

The discussion about load rating is more appropriately directed towards SUV’s, and not rear wheel drive two-seat sports cars.

--Spike
Load ratings are totally applicable to two-seat sports cars, and any car with tires. I gave the example earlier of fitting snow tires to the Z and the different pressures required there, and the Michelin PS2s which required a different pressure also.
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Old Feb 28, 2010 | 05:48 PM
  #105  
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i got the same question, but with differnt specs R: 295/35/18 F: 265/35/18
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