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#31
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Cross toe of 0.16" is fine with BMW and you will get 5k miles. Cross toe set at 0.01-0.02 and you get 25k miles. And you are visually estimating toe and camber?!?! Why so complicated? Adaptive drive, etc, etc. Like asking to diagnose a patient yet refusing to have a blood test. Take it to any alignment store for a $99 alignment- BMW is absolute BS for alignments. Finally, tell the BMW SA you'll pay for the alignment check only if they are within certain limits- so he needs to put his money where his mouth is. (And how could you initially post the alignment is spot on?) Last edited by ard; 08-18-2011 at 12:58 AM. |
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#32
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... which is why I don't get all this argument for why summer tires are the only way to go on a "truck" like this. You can say BMW R&D spent all this time and effort to make the most optimally performing car, but then they gave it "inferior" RFTs for our convenience. Shouldn't they have gone summer non-RFT for the 20" wheel upgrade package if that was their intention?
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'08 X5 3.0si - Alpine White / Saddle Brown interior Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights Coded: Digital speedo, windows/sunroof/tailgate close via keyfob X5 pics at Flickr |
#33
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2008 X5 4.8 Jet Black/Black Nevada/Dark Burl Walnut Adaptive Drive Premium Pack Tech Pack Climate Pack Sport Pack 20" Wheel Option Premium Sound Sirius Satellite Rear DVD Entertainment Multi-Contour Seats Comfort Access 3rd Row Seat Heated Front Seats Running Boards 3M VentureShield Paint Protection Film |
#34
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All design involves trade offs. Handling, noise, harshness, cost/mile, manufacturing cost, owner convenience, safety, etc. BMW engineers just found their own best balance across those items with RFTs, not necessarily the best in any one category. Biggest reasons for run flats are packaging, convenience, and safety. Cost is actually higher, partly due to the need for a tire monitoring system. Packaging is obvious. Convenience: how many owners change their own flat tires any more? Now they don't have to. Safety relates to blow outs at speed. Not a common occurence these days IMO, but BMW can point out that the car will be more likely to stay in the lane. Most drivers of modern BMWs are not performance drivers, IMO. And as someone who does tend to critically evaluate my own tires, from the performance viewpoint, I didn't mind my run flats at all. I predict that one day before too long, all tires will be run flats, just as it is very difficult to find non-radials these day. When radials first came out some didn't like them, as when they broke loose, they were less predictable, and less progressive. They gripped more, to a higher limit, and then let go more abruptly. We all got used to it. Look for the day when jacks and lug wrenches will be in the museum with the spark-advance cables and distributor caps.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#35
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To further JCL's point, the Corvette ZR1 has run-flats, and it is not at a loss for performance.
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#36
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RFTs on a ZR1 are perfect for the waxer crowd. which last time i checked is about 90%. |
#37
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Way OT...but so is the thread, and the MIA OP.
Our '02 Vette came with the normal RFTs, as do all Corvettes of recent vintage, and also any car that does not literally the 'room' for a spare, or in the interior pkging, the space. Add in the Biffy & Buff factor, and I agree with JCL that any car one buys near the end of this decade will have RFTs. It is the way of the future, tire-wise for some good reasons, and some 'mkting'/bs not so good reasons, imo. The Vette ran fine with the oe GY RFTs, and handled well with the Z51 suspension, though it is no Z06, but runs around these Mtn roads like a go cart. The oe RFTs lasted ~30k miles, though they were very noisy at the end. I replaced them with the foo foo GY Eagle SuperCar F1s, non RFT, and these tires are ok. Stick like glue, though turn in was decidedly 'different' when new/newish. 20k miles later, hauling our azzes around the country on a 13k mile road trip, I came to like and trust them, though at their current mileage, there is not huge tread left...and, I do Zaino my Vette 3-4 times a year, but I guess that puts me in the garage queen slot. As for running non-RFTs, I was seldom worried; I had a plug kit and compressor in trunk, and a cell phone and a couple big CCs...and, currently, getting a largeish RFT of any size/brand replaced, at the local tar joint, in much of North America, may be a 2 day wait. But, it's 'progress', and it is the way tire apps are going. Do I run it on a track? No...the track runners of any brand, are a handful, and gluttons for annual new brake pads/rotors and that catchy new set of track tars. Losing my point, other than this thread is typical of what the OP starts, and seldom if ever finishes: no further responses/follow-up, or resolve. Meanwhile, a half a dozen of us are posting on which tire does the 'best' on cloudy days in some situ... RFTs are here to stay. I will try and replace my 3 cars sets with non-RFTs, 'next time' again, if I can. Either way does not really bother me, though I would have a slighty higher level of comfort with RFTs back on the Vette. But, no biggie either way. Could not care less about his/the OP's situ, at this point... GL, mD
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Ol'UncleMotor From the Home Base of Pro Bono Punditry and 50 Cent Opins... Our Mtn Scenes, Car Pics, and Road Trip Pics on Flickr: http://www.flickr.com/photos/4527537...7627297418250/ http://www.flickr.com/photos/4527537...7627332480833/ http://www.flickr.com/photos/45275375@N00/ My X Page Last edited by motordavid; 08-18-2011 at 08:33 PM. |
#38
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try Michelin PS2s next time on the Plastic Fantastic MD. much better wet traction.
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#39
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GL, mD |
#40
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I am running Toyo Proxes STs on my X5M and they are much better than the stock Bridgestone runflats. The lighter weight is noticeable. I ran these same tires on my previous 4.8 when I lived in Reno/Tahoe, where I used them year-round (to many ski trips and through many snow/blizzard days) and then in Florida. I got a total of around 35,000 miles on the last set and I'm not gentle on them by any stretch of the imagination...throwing the 4.8 around corners and through off ramps.
The first day I had them on the M, which had just over 1200 miles on it at the time, I ran a VBox measured 0-60 in 4.5 and 1/4 in 12.9@108 without launch control...in the rain.
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2017 Nissan GTR Red/black - Tune/midpipe 2013 BMW X5 50i M-sport Alpine white/black - Dinan stage 1 2016 Jaguar F-Type R Gray/red |
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