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Type_LT · 10-31-2009, 04:38 PM

Macster,

Looking at the area where the sidewall meets the tread I see no runout axial or radial (~< 1 mm).

If i look at the interface between the rim and tire I also see no axial or radial runout (~< 1mm).

Where I do see a discrepancy is when I put a reference marker in the middle of the tread. As you rotate the tire it's almost as if you see a flat spot. The car was driven about 12 hours ago so there shouldn't have been time for a flat spot to develop. I would say the difference is about 2-3 mm compared to the rest of the tire. The flat spot occupies about 10-20 degrees arc. Both tires have this flat spot, so, I guess it could be from sitting for 12 hours.

Tires are exactly at the correct PSI as stated on the drivers side panel. I also looked at the tires a lot without any pointers, rotating them by hand for a few minutes and simply didn't see anything obvious.

Is ~< 1mm axial or radial runout going to cause a problem?

I wish I could take it out the track and just melt them down a bit

. Sometimes I feel a good thrashing on the track could smack the tires into shape. Or, at least cause them to fail quickly to get it over with!

I sure miss my 18" Z rated summer tires, they were smooth as butter.

Thanks again for all the help. I'll report back when the new front's are put on next week.

10-31-2009, 04:38 PM	#5
Type_LT Addict Rennlist Member Join Date: Nov 2001 Location: Tax Me To Death CT Posts: 1,035	Macster, Looking at the area where the sidewall meets the tread I see no runout axial or radial (~< 1 mm). If i look at the interface between the rim and tire I also see no axial or radial runout (~< 1mm). Where I do see a discrepancy is when I put a reference marker in the middle of the tread. As you rotate the tire it's almost as if you see a flat spot. The car was driven about 12 hours ago so there shouldn't have been time for a flat spot to develop. I would say the difference is about 2-3 mm compared to the rest of the tire. The flat spot occupies about 10-20 degrees arc. Both tires have this flat spot, so, I guess it could be from sitting for 12 hours. Tires are exactly at the correct PSI as stated on the drivers side panel. I also looked at the tires a lot without any pointers, rotating them by hand for a few minutes and simply didn't see anything obvious. Is ~< 1mm axial or radial runout going to cause a problem? I wish I could take it out the track and just melt them down a bit . Sometimes I feel a good thrashing on the track could smack the tires into shape. Or, at least cause them to fail quickly to get it over with! I sure miss my 18" Z rated summer tires, they were smooth as butter. Thanks again for all the help. I'll report back when the new front's are put on next week. __________________ 2005 Boxster 2004 A4 1.8T w/slushbox 1986 944 Turbo 160k, SOLD (8 years of reliable daily driver service!)