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· ///Multiple
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Discussion Starter · #1 ·
I just bought a 2006 Z4 M Roadster with only 31,700 miles on it from a BMW dealer in Northern California. I ran across the original owner on ZPost.com and he said that he put 19" wheels and tires on the car within a few weeks of buying the car new in July 2007 with 98 miles on it and just put the original tires and wheels back on when he traded it in for a new 135i in June. The tires probably had only a few hundred miles on them.

The good news is that the original wheels are in perfect condition. The bad news is so are the tires! The production date on the tires are the 1st, 2nd, and 7th week of 2006. The tires probably spent the last five years in his garage so there aren't any cracks, probably no UV deterioration, and they haven't had any weight on them. The question is do they need to be replaced because of their age?

I'd like to put Michelin Pilot Super Sports on the car but I'd like to wait until at least next year. I'll probably do 3-4 autocrosses on them this year to hasten the wear.

Stock size is 225/45-18 on 8" wheels in the front and 255/40-18 on 9" wheels on the rear. Can I go wider with a lower profile? What's the recommended size? The car has H&R Sport springs on it with a 1" drop. Some people are running 235/40-18 or 245/40-18 in the front and 265/35-18, 275/35-18, or 285/35-18 in the rear for replacements.

I'd appreciate some advice from the pros!
 

· East Coast Commuter
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4,734 Posts
Tom...my advice is not expert, but I think I am correct. The biggest problem with age deterioration on tires is that they spend time holding the car and exposed to the weather. This is what causes cracks, ect. These tires were removed from the car and stored inside. I am willing to be they are just fine despite the age and can be driven until needed replacement. I ll ask Gary to confirm, but I think you are good to go. BTW...nice M roady....very nice indeed.
 

· Registered
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4,492 Posts
Tom...my advice is not expert, but I think I am correct. The biggest problem with age deterioration on tires is that they spend time holding the car and exposed to the weather. This is what causes cracks, ect. These tires were removed from the car and stored inside. I am willing to be they are just fine despite the age and can be driven until needed replacement. I ll ask Gary to confirm, but I think you are good to go. BTW...nice M roady....very nice indeed.
I agree with you.

Tires deteriorate very little when not exposed to UV, large swings in temperature and constant heat cycling/flexing from daily driving.
 

· ///Multiple
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4,586 Posts
Discussion Starter · #4 ·
Great! This was my gut feeling but I thought it was worth double-checking. It's good to know that I can still drive on them until next spring without worry.

Alpine300ZHP: Thanks! I think it was a really good find!
 

· <- Bailey
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45,761 Posts
Yeah. i first went Uh OH. Then I heard they were in the garage, no UV, and no huge temp variations.

That is why cars should be in the garage when not on the road. It makes such a big difference in the rubber and other parts too.

Keep a close eye on air seepage. If you get that, you might need to replace anyway, as that could indicate deterioration.
 
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