Quote:
Originally Posted by ZDan
Having a "higher max pressure rating" has zilch to do with what appropriate pressure is for these cars. Higher max doesn't mean you should run higher pressures, it just means that you can pump them up to carry more load.
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Didnt say anything like this. But a lower pressure rating needs be taken care of, not only if you load your car.
The pressure rating does not necessarily correlate to the load Index. Even if this is true in some cases, its not true in all. In case of the RS-R the pressure rating is very low. Sure, this doesnt necessarily mean that it needs less pressure then a identically sized tire with a higher pressure rating, but is an indicator that the tires construction is made to work with lower pressure. If this is realy the case of course needs to be tested as perfect pressure settings needs to be tested for any new type of tire used.
Again, I didnt say the pressure rating directly correlates to the pressure to be used for a tire. But to implicate this to my post would also mean to implacte to your post that each tire of a specific size on a specific car, but from different manufacturers and/or different types, will work perfect with one and the same pressure setting, no matter what load Index or pressure rating. And I think you will agree that this also isnt true.
An example: A Michelin PSS in 245 35 18 works great at pressures around 2.4 to 2.6 bar on the 86. Thats at least the pressure for best grip and optimal temperature distribution. For the RS-R this is somewhere between 1.8 and 2.0 Bar. The PSS has a max rating of 3.4bar, the RS-R of 3.0bar. If you set a cold pressure of 2.6 bar, which works good on a PSS, to a RS-R you are risking to exceed the max pressure rating for this tire when warm.
Again, I dont say that this is a always-true rule, but the pressure rating is a indicator for the type of tire constrution and at least needs to be considered.
To keep with the example above, the RS-R has a way stiffer construction then the PSS. It follows complete different attempt of tire design. If you run a RS-R with the pressure you would run a PSS and you call both good, you're at least wrong once. ��