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2010 2011 BMW 5 Series Forum F10 Replace both tires after just 4000 km? |
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04-29-2014, 02:04 PM | #1 |
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Replace both tires after just 4000 km?
I have been very happy after I sold my 18" summer wheel set with Conti RFTs and replaced them with 19" Michelin Pilot Super Sport tires on the 351M wheels. The grip, the handling and everything else improved considerably.
Lately, I hit a pothole with my left front tire and even though no bulge appeared, and nothing changed in the overall feel on the steering wheel, I asked my dealer (who have just got the latest and greatest Hunter machine of which they're very proud) to inspect for any damages. The wheel didn't suffer at all, but - basing on the excessive road force of 110 N (some 24.73 Pounds) reading - they said the tire was damaged inside, and as such needs to be replaced. I didn't have the wheels road-force-balanced from the beginning, so cannot be sure how this tire was before the impact - all I know is that absolutely nothing has changed in the car's ride; no vibration or anything. Now my question to you guys: - if I wanted to stay on the safe side (I drive rather fast), and buy a new tire - considering the tread wear on the other front tire after 4000 km - should I absolutely be replacing both tires, or would it be an overkill and only replacing the one with excessive road force would be enough? TIA!
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04-29-2014, 05:28 PM | #2 |
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I'm not a tire expert at all so my comments may be worthless. IMO, if there is no bulge and the tire feels the same as before I wouldn't replace anything. With the current state of the world's roads there isn't a tire out there that hasn't hit a major pothole.
If you have no doubts that the tire is damaged then I would only replace the 'damaged' one. Four thousand km is nothing. I replaced only one winter run-flat after complete failure where the other three had 15,000 km. After two winters, I have detected no problems or vibrations. Get a second option from a Michelin dealer and slow down.
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04-29-2014, 11:37 PM | #3 |
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If it doesn't feel any different and you can't find external damage there is nothing wrong with the tire - it is just rubber after all. (However the rim, or other suspension parts could have sustained damage.
Just have it rebalanced which takes 5mins. |
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04-30-2014, 01:54 AM | #4 |
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Thanks for your opinions, guys - they are sweet to my ears However, it's not like @grimlock said "just a rubber", and the internal nylon (or whatever material Michelin uses) reinforcement might have indeed suffered. I guess I will "slow down" for now (as another of you advises), take a second opinion and only then - should it be the same as my dealers', or should a bulge appear in the meantime - replace just the one tire. The only drawback of this approach is that by keeping driving, I will be wearing the other tire's tread
PS. I found a pic of the PSS cross-section: As can be seen, it IS possible that the reinforcing belt got damaged without causing any bulge on the tire side. Now - will I have the guts to drive as fast and confidently as usually with the dealer's opinion in the back of my head? Can anyone advise how to make sure (less replacing the tire)? Specifically - assuming there is some damage - how will it develop: by spreading out to the extent of actually bulge appearing, or exploding at high speed?!!
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previous: 2003 E46 330i SMG
just sold: 2013 F10 528i xDrive my AWD beater: 2015 Golf R mk7 DSG my RWD pirate & long-distance cruiser: 2015 M235i AT8, LSD Last edited by moldcad; 04-30-2014 at 02:42 AM.. |
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04-30-2014, 08:11 AM | #5 |
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OK - so I asked a second opinion from independent tire shop (also with a Hunter machine; the same who mounted and balanced those wheels for me the first time after I got them new). Their measurement of the complete "damaged" wheel is 7 kg (some 15 pounds, so I'm now 50% above the limit on that hit tire).
What's your opinion - keep it (I feel no vibration), or replace with a new one? The guy says that when new, all my tires/wheels were up to 4 kg...
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previous: 2003 E46 330i SMG
just sold: 2013 F10 528i xDrive my AWD beater: 2015 Golf R mk7 DSG my RWD pirate & long-distance cruiser: 2015 M235i AT8, LSD Last edited by moldcad; 04-30-2014 at 08:45 AM.. |
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05-01-2014, 01:37 PM | #6 |
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moldcad-regarding your question about bulges. I have had two bulges on my tires. One was severe and the tire was replaced. The second one was a slight change to the sidewall which I have not replaced. In fact, it seems to have completely disappeared over the past year.
However, to your question, sidewall bulges only appear when the pothole is hit. To my knowledge, they do NOT spontaneously appear after the fact. I'll stick with my original opinion and not replace anything.
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Retired: 78 300D, 81 300SD, 87 190E, 88 Porsche 924, 89 260E, 93 300E, 97 Volvo 850, 98 E320, 03 BMW 325iT, 02 C230 Sport Coupe, 08 BMW 535i, 12 BMW 535i X-drive |
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05-01-2014, 02:54 PM | #7 |
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Look at the inner sidewall for any issues as well. If you notice a bulge, it's time to replace that tire. Even if the bulge is small/minimal, it is essentially a ticking time bomb, and the tire is compromised structurally. If you don't notice any issues with the tires after carefully inspecting them, they are likely to be fine. The Road Force numbers don't seem too excessive either, and that just suggests that it might not have been Road Forced from the beginning.
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05-02-2014, 10:50 AM | #8 |
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Yep - a ticking bomb, that's what I'm afraid of. Simply because I only travel outside towns, and when roads allow with rather high speeds (up to the limiter at autobahns). And to think that I visited 2 shops (one of them being BMW and as such biased towards selling me a new tire), and none of them was diligent enough to actually remove the tire and inspect the inside!
But on the other hand, common sense dictates me a faulty tire is something very common, and - as I can't feel anything unusual in my car's ride or any vibs on the steering wheel, I might as well continue using the tire...
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previous: 2003 E46 330i SMG
just sold: 2013 F10 528i xDrive my AWD beater: 2015 Golf R mk7 DSG my RWD pirate & long-distance cruiser: 2015 M235i AT8, LSD Last edited by moldcad; 05-02-2014 at 03:02 PM.. |
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