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#11
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(275/40-20 front, 315/35-20 rear) |
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#12
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Hmm, I've always been under the impression that they were but I guess my service advisor was blowing smoke up my tailpipe.
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#13
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Michelin would put a "ZP" for zero pressure capability on the sidewall of a runflat. For your model, runflats were not an option based on our info from BMW. You do have a low pressure sensor on the car so it can tell you if a tire is going flat, but you'd have no ability to drive on the flat.
Last edited by doc@tirerack; 02-14-2008 at 12:25 PM. |
#14
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I have the stock 20's with stock size tires on my X5. It's my mistake that I didn't do my own homework and took my BMW's service advisors word for it. Also I live in a developing neighborhood and as a result have had plenty of nails, screws, etc. resulting in lots of flat tires and the TPMS tells me on the MID. The only reason I believed my service advisor about the Diamaris being runflats is that I could visually check my tires and can't tell which one was flat. Come to find out that when checking with a gauge that the one has only 5 psi sometimes less, meaning not enough to move the gauge at all. Still visually I can barely tell that it is the one with the leak.
I totally believe you Doc but can anyone say that they have ever had a flat tire with the 20's Diamaris to where it was visually obvious and undriveable and had to use the spare? I wonder if the sidewalls on the Diamaris for the 20's are strong enough to not appear to be flat when in fact it is? Had me fooled! |
#15
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Diamaris run Flat
I would definitely say the Diamaris are run Flats from experience. Left my house one morning in NY and the Temp was about 4 Degrees. I got on the highway late for a meeting and looked down and saw the Tire Pressure light on. Figured because of the cold, one of the tires pressure dropped and the heat into the tire would bring it back up but I would stop at a certain gas station on my route to double check. Station was about 20 miles away. Ran down the Highway at 65+. Pulled into the gas station to check the pressure and sure enough. NO AIR! Bead was broken as well and the tire drove fine. Had to jack the car to re set the bead and put air in. Went on my way. So I would say yes....Diamrais are Run Flats.
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#16
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They are 100% NOT runflats.
Everyone should be happy they aren't also, because it saves weight, rides better, and its less $$$ to replace. I personally hate runflats.
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#17
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See I have had this same type of experience more than once too which prompted me to think that these were in fact run flats. When I went to install my new set of tires I had them remove all the centers of the valve stems to fully deflate the Diamaris before lifting up and removing them from the car but my X5 still sat normally as if they were runflats! Now he did verify that they didn't have the runflat rating and when he dismounted the tire from the wheel he said it was easier to remove than a runflat would have been. I guess the side walls must be strong enough to hold up our heavy X5 when fully deflated. But wouldn't that make it a run flat? I mean I should have took a picture of it, you couldn't tell by looking at it that the tire had no air pressure in it!
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#18
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Again, has anyone with 20" Diamaris ever have to use their spare due to lack of air pressure (flat)?
At this point I'm not challenging that the Diamaris are runflats but rather that maybe they could have been and at least serves as such for me and my application with the 20's and my X5. What constitutes a runflat anyways? My hats off to the Diamaris for saving me having to change out to my spare numerous times. I guess that partially makes up for such a short life span. |
#19
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On the same note, which tires are the quietest? Is there a matrix/list somewhere of the brands and there features and benefits. I've read through this forum, and i got confused about the various brands and sizes people were talking about. For example, it seems like folks love the 20' Pirellis and Yokos, but like the Michelins for winter - only to find out that they are 18" wheels.
We recently test drove 3 used X5s (all 4.8is) - almost decided not to get one because of road noise. The 3 vehicles had Michelin, Yokohama and Toyos. The Michelin's were really really bad - with only 20K miles. The Yoko's and Toyos were not bad - still a bit loud compared to a new 2007 4.8i or 2006 4.4i with 20K miles. Not sure where i stand, but the next X5 4.8is i drive better be quiet or my wife will push for the newer X5 and maybe the 3.0 (and i obviously don't want that!). |
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