11-25-2014, 08:46 PM | #1 |
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Am going away from Run Flats
2011 X3 35i Sport came with the staggered set up but I'm going out on a limb here and moving to non run flats, all the same size. Anyone have experience with this?
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11-25-2014, 09:24 PM | #2 |
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Yep. Ditched mine about a year ago and went with Conti Extreme DWS and love them. Don't miss the run flats at all.
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11-26-2014, 12:12 AM | #5 |
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I keep an air compressor and can of slime in the car. They now sell slime that does not mess up the TPMS so I went with that.
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11-26-2014, 12:55 AM | #6 |
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I got 20" non-rft and they are more plush than my 19" rft winter Tires. So I definitely prefer the non-rft. Not sure what to think about running non-staggered: my 19" are all same size (245/45).... When accelerating in corners I can feel them losing grip in the back. My 275 grip better, so if you drive aggressively, then I'd suggest staying staggered.... Especially with a 35i (I drive a 28d). I however don't bother about having a tire repair kit. Have been driving for 20years and - knock on wood - never had a flat:-)
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11-27-2014, 09:42 AM | #7 |
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I switched to non-run flat Michelins about a year ago and I love them. They ride better over small sharp bumps like highway expansion joints. They're quieter. I expect they'll wear longer. And they cost about half as much as my old run flat Pirellis. They're 7 lbs lighter per tire than the run flats, and 7 lbs less unsprung weight at each corner is a big handling advantage. Basically, they do everything better except run when flat. I carry a Continental compressor with a slime sealant cartridge built in, but I haven't had any need to use it yet.
I noticed a compact spare is an option on the new X5. Is BMW finally admitting they made a mistake betting heavily on run flat tires? |
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11-27-2014, 10:01 AM | #8 | |
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Slime and compressor...in a nice bag with matching gloves. |
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11-27-2014, 10:13 AM | #9 |
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I doubt the lighter tires make that much of a difference on the street handling wise, I am guessing you replace your runflats with higher performance conventional tires hence the performance improvement. If you track your X3 lighter tires' biggest advantage is acceleration, lighter tires means less mass for the engine to rotate. The difference might be 0.1 or 0.2 seconds off a 1/4 mile run, but I doubt most owners of X3 cares about that. The gas mileage and the ride comfort will also improve a tiny bit, the cost is also a bit cheaper. I guess its up to the individual owner to decide rather they are willing to the added safety of runflat tires for those improvements.
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11-27-2014, 12:13 PM | #10 |
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I once read that rotating mass has factor of six compared to static mass. If that is really true, then the additional weight of rft needs to be multiplied by 6. So 7lbs per Tire is equal to 42lbs static weight. Multiply that for every wheel..... That means as far as the engine and brakes are concerned, the rotating mass is like having 168lbs more in your car. So if weight is an issue, then stay away from rft and put the wife on diet;-)
Personally I will replace my winter rft with non-rft sooner or later because they are so much more comfortable and lighter... Already running non-rft in the summer and I love them. Why carry the additional weight if you don't need to? |
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11-27-2014, 08:24 PM | #11 |
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Reducing unsprung weight (the total weight of components not supported by the springs, like wheels, tires, brakes, etc.) enhances the suspension's ability to keep the tires in contact with the road. Less unsprung weight = more grip, better handling, and more driving enjoyment.
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11-27-2014, 10:05 PM | #12 |
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So with the slime, similar to a mountain bike, ie get non RFT, put the slime, top up every few months? What brand does not affect tpms?
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11-28-2014, 01:34 AM | #13 |
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11-28-2014, 04:30 AM | #15 | |
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To be honest from a cost factor I haven't seen a huge difference between non run flats and run flats, unless you are happy to go to a cheaper brand of tyre. The only reason I would change is to assist in ride quality, but again I don't find the X3 that bad, especially compared to my 3 series. |
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11-28-2014, 12:32 PM | #16 |
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I was asking in a tyre dealer about changing to non run flats and he said be careful, because he had a customer with a M5 and BMW had refused his warranty claim because he had changed to non run flats. Can't really see why, but I will check with BMW before changing. Has anyone else heard this
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BMW X3 (F25) xDrive20d SE . . Deep Sea Blue. . Oyster Leather . . 8 Speed Servotronic. .RFTs. . High Beam Assist. .Pro Nav . . DAB Radio. .USB/Bluetooth
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11-28-2014, 12:58 PM | #17 |
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Yup. The slime (a kinda rubber glue) seals the hole in the tire just enough for you to drive to a service station.
Example of the BMW M mobility kit Last edited by Scandic24; 11-29-2014 at 04:02 AM.. |
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11-28-2014, 02:46 PM | #18 | |
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For the record, I've been running non-runflats for 3 years. I have a full size spare permanently tied down in the back. Yes it does take up a bit of room but in our situation (there's only the two of us now with the kids long since moved out) its never been a issue. Having said that, in those 3 years I've never had to use the spare despite the amount of long distance country driving we've done on less than perfect roads. Tony |
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11-28-2014, 09:44 PM | #19 | |
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11-29-2014, 04:32 AM | #20 |
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my 2013 X3 was ordered with 17" non runflats and the car comes complete with bmw slime and compressor. I have had one puncture so far and was a slow puncture so didn't use the kit. The tyre pressure warning on the dash came up and I had to measure the pressures to determine which tyre was at fault ( 3 psi down). The tyre had a small screw in the centre of the tread and this was repaired. So I am happy so far, but would prefer to have a spare and would like this to be stored out of sight.
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11-29-2014, 06:44 AM | #21 | |
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