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YOUR RESEARCHPossible dry rot on front tires
Leading reported evidence
Use much more frequently usually
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Rv's offer a good window into old tire problems that cars usually do not because cars get used much more frequently usually using up the tread way before tire ages out.......
Leading evidence: 'Use much more frequently usually' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check dot code' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
Don't know about you guys, but I've had my fill on trying to control vehicle at 150mph with blowout in the middle of a high speed sweeper onm a desolate highway in west Texas...
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Suggestion
While some may last up to 10 years if perfectly stored, 6 years is the recommended threshold for inspection, with mandatory replacement by 10 years.
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Replace because you'll love how the car will respond to steering input and how the new tyres will suck up ridges, expansion joints and repair patches.
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Don't know about you guys, but I've had my fill on trying to control vehicle at 150mph with blowout in the middle of a high speed sweeper onm a desolate highway in west Texas...
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Rv's offer a good window into old tire problems that cars usually do not because cars get used much more frequently usually using up the tread way before tire ages out.......
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The 2 front tire images are from my 2000 Porsche 911 996. Michelin Pilot Sports dated 2018. Car drives fine. Daily driver 60 miles round trip 5 days a week on smooth asphalt in Georgia. Do I need to replace them due to possible dry rot and age? Please advise.
Here's a direct quote from Michelin's official website, you're fine, unless you're tracking, IMO:
What is the expected service life of tires?
While most tires will need replacement before they achieve 10 years, it is recommended that any tires in service 10 years or more from the date of manufacture, including spare tires, be replaced with new tires as a simple precaution even if such tires appear serviceable and even if they have not reached the legal wear limit.
I would. Those are about 8 years old. I'd replace them just because of the age.
Michelin 4S 225/40 18 are about $240 at tire rack.
Michelin Pilot Sport 4S | 225/40ZR18 - diameter Front | 265/35ZR18 - diameter Rear | Tire Rack
Quick google search:
Porsche 911 tires should generally be replaced
every 6 years
, regardless of tread depth, to avoid safety risks from rubber degradation. While some may last up to 10 years if perfectly stored, 6 years is the recommended threshold for inspection, with mandatory replacement by 10 years.
Key Considerations for 911 Tire Age:
Safety Threshold:
Tires over 6 years old often lose elasticity and can develop cracks or dry rot.
Performance Impact:
Older rubber can make the car feel "floaty" and reduce grip, negatively affecting the driving experience.
Inspection Signs:
Look for color fading, brittleness, and cracks.
Check DOT Code:
The manufacturing date is found in the DOT code on the sidewall (e.g., "1222" means the 12th week of 2022).
Usage Factors:
Frequent heat cycles (track use) or long-term storage can accelerate aging.
Either way, you will love the feel of new 4s tires on there.
Replace because you'll love how the car will respond to steering input and how the new tyres will suck up ridges, expansion joints and repair patches.
The biggest issue with such old tyres is their loss of grip when roads are damp and wet.
Aquaplaning is solely down to too little thread depth (for the given height of standing water and driven speed) so not affected by age as much as wet (non-standing water) grip is.
You can see cracking too and while it will not lead to a blown tyre (too little pressure or worn down to the cords inner shoulder will, however) it definitely is a sign that the rubber has reached the end of its service life.
What's the age and tread depth, especially on the inside of the rear tyres?
Depending on those you could consider replacing all 4.
I would only temporarily mix different tyre brands and/or product lines in case I wanted to change over.
Porsche recommends replacement after six years.
I've seen dry rot like that after less time, depending on how they're stored.
For driving around town, they're fine. For any sort of backroad or highway driving, they need to be replaced.
This is one place I can share my over half century experience of driving cross country in many different type vehicles. I stopped counting after a million miles....
Those of us familiar with RV's know all to well the pitfalls of old tires that look great. Rv's offer a good window into old tire problems that cars usually do not because cars get used much more frequently usually using up the tread way before tire ages out.......
Its common that RVs get used so infrequently the tire will still have plenty of tread left but are over 5 years old. Some, if in the sun, start to show checker cracks on sidewalls, or cracks in tread. Doesn't matter, if tire is over 5-6 years old its a blow out candidate for sure. Some with cracks can last for a long time after noticing the cracks, some with no cracks still fail in a catastrophic way.
On cars/trucks the driver usually gets a warning. A thump thump thump noise, maybe vibrations that get worse and worse. Sometimes rapidly, so on the highway in a 5-10 minute period, tire goes from feeling perfect to thumping vibrating and blowing out in a spectacular way. Or at very high speeds, no warning, just bang blowout. Hard to feel/hear that warning towing a trailer.
Driving in areas out west frequented by RV'ers, I've seen many times others on the road and my on own, a old almost full tread tire that looks good, maybe a few cracks, blow out and its steel belts wrap so tightly around the axle its almost impossible to unwind the steel wires when changing to the spare. Seen RV wheel well/side of RV get totally destroyed from old tire blowouts. Even busting/taking out propane lines near the wheel well and lots of damage to RV...
Point is, old tires come apart form the inside. Not sure if its the rubber giving out and belts separating or what. Old tires looking perfect 'failures' happens often.
On a passenger vehicle you probably could get away with using them at moderate/low speeds knowing the possibilities and being aware of new vibration/noise that's the harbinger of things to come...
If you do want to try and 'get your monys worth' out of an old good looking tire, would not suggest high speed runs with old tires on your 996. That could expedite things to an instant blowout. Don't know about you guys, but I've had my fill on trying to control vehicle at 150mph with blowout in the middle of a high speed sweeper onm a desolate highway in west Texas...
So you're not alone in wanting to use your plenty of thread left expensive OLD tire till the tread is worn out. Just be forewarned if you choose to....
This thread reminded me that my current Michelins with tons of tread left are waaay overdue for replacement.
I'm thinking about maybe going with Toyos this time around since the price is about the same...
The spare in the e39 is the original Michelin with zero miles on it but it will be 26yo this April.
For the price, you may want to consider the Bridgestone RE71RS or the new RE71RZ.
I had a couple of sets of the Toyos that i used on both the street and track as well as a couple of sets of the Bridgestone RE71RS. I was blown away by the Bridgestones. Great on the street and track. Very sticky, much more quiet than the Toyos which were very loud. Good in light rain where the Toyos were not. As well as the Bridgestones were still grippy in 40 degree temps which surprised me. Toyos were OK in the lower temps if you were careful.
Supposedly the new RE71RZ are even better in the rain amd more durable with the new tread design and compounds. I wont get a chance to test them until may since I have one more track day left in my RE71RS tires.
I run them from April thru November on my car then switch to Michelin PS All Season 4s for the lousy weather months.
Best of luck.
Those tires are abused. 8 years and look how much tread is left. Are you trailoring that car 60 miles a day?
Yes, get new tires, but get some wear out of those tires.
