Re: My analysis of the cupping issue is... - Saab 9-5 Bulletin Board - Saabnet.com
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Re: My analysis of the cupping issue is...
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Posted by CrNiFe [Email] (#408) [Profile/Gallery] (more from CrNiFe) on Tue, 8 Nov 2005 06:52:16 Share Post by Email
In Reply to: Re: My analysis of the cupping issue is..., 8AA2YM, Mon, 7 Nov 2005 21:23:30
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I used 37 to 39 psi on 93H rated tires (Ovation by National) on 16 inch aluminum rims, 5 large spoke style. These tires have a maximum of 35 psi, so that was not really a great idea. I checked with my local reliable tire supplier about getting some tires with a higher load rating, but it didn`t make a lot of sense - I was thinking about the sidewall stiffness factor.

It is the squidging (great word, describes it exactly!) of the tread element as the rubber hits the road, with a slight rotation at an angle, on the leading edge, that creates the symmetrical wear pattern around the inside.

Another dimension to the problem is that I had 4500 km plus on the tires since the previous rotation, and I should have rotated before the holiday run of 5000 km. I admit that some of this is my fault - and I know better.

Because my vehicle is older, and was bought second hand, I have no idea if the previous owner used the cargo area to move patio stones around. But during the holiday, the car was sitting slightly lower as time progressed. I probably ran with the full load about 8 days out of 18, because we unpacked the car a few times.

I don`t have the figures in front of me, but I did look at the GVRW numbers and I remember being about 150 below the maximum.

I will post any new findings on the TSN BB.

Cheers,
CrNiFe


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