09-30-2018, 08:59 PM | #67 |
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Can't find the article, but a BMW product manager based in Bavaria made that idiotic statement, and I for one was idiotic enough not to think it through. The editors were also idiotic for not questioning him further. It was quite a diatribe on "don't change from your OEM RFTs." And he specifically mentioned the car being "set up" for them, not just the "safety" factor of not getting stranded.
Still, I would love to see one of the mags who have professional drivers on call do a real test on a track, skidpad, etc. and put the issue to rest, if possible. Obviously, a dedicated summer tire will always handle better than a RFT or A/S. Whether it's a world of difference is what we want to know. The consensus here seems to suggest a "marked" difference. For me, that is not the ability to go from 8/10th to 10/10th, as I don't track. But steering feel, wet traction, general grip, that gets my attention. |
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09-30-2018, 10:31 PM | #68 |
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Direct quantitative comparisons don’t seem to be available from my brief search, but I did find Tirerack tests of the Michelin Pilot Sport PS2 in ZP (run-flat) and standard (non run-flat) form performed at the same time of year on the same car (E92 328i) and the same size (225/45-17), with the following results:
Dry braking: RFT - 89.4’; non-RFT - 86.7’ (3% difference) Wet braking: RFT - 112.1’; non-RFT - 111.8’ (0.3% difference) Dry cornering: RFT - 0.89g; non-RFT - 0.98g (10% difference) Wet cornering: RFT - 0.73g; non-RFT - 0.74g (1.4% difference) The biggest difference is when the dry tread has to comply to the surface the most, under hard cornering. |
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09-30-2018, 11:51 PM | #69 |
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Still, pretty interesting. My 1998 Camaro Z28 (non-SS) did 0.88g in the dry using 245/50/16 Goodyears. That's 20-year-old tech and far from phenomenal. Yet that's the figure for MPSS RFTs on the E92. Upping that by almost 1.0g with non-RFTs seems quite significant to me. Of course, there's more than dry grip to take into consideration; maybe - noise, responsiveness, following road imperfections, etc.
The 2018(?) M240i RWD Car & Driver tested for its 10BEST got 0.94g, obviously on non-RFTs. That's all I can find on my particular model. |
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10-01-2018, 08:10 AM | #70 | |
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Also, one must take into account some cultural issues when listening to folks from Munich. I recall the old story - perhaps true, perhaps not - in the early days when BMW received complaints about not having a tilt steering column, the supposed response from Bavaria was, "We spent all this time finding the perfect angle for a steering column and you want to change it?!?!?!?"
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10-01-2018, 09:42 AM | #71 |
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Interesting article in October C&D (or maybe R&T, I'm not home in the john to check) suggesting that people often buy too much tire. Part of the argument is the couple of hundred bucks per tire, of course, but they also point to the fact that if you're not tracking the car or driving like an idiot (don't drive like me), you'll get more fun from a lesser tire that can start generating a bit of slip and feel at speeds within your competence.
Worth thinking about, IMO. |
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10-01-2018, 05:24 PM | #72 |
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I have the wheel and tire package included on the lease and have used it so many times I got my money's worth out of the program. They're crap tires. I would have preferred a spare...but the added weight would be contradictory to the performance.
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12-04-2018, 12:55 AM | #73 |
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Apologies if I've overlooked a post on this already, but I'd like an opinion from someone who has switched from RFT Bridgestone Driveguards (which were on my 2015 M235xi when I bought it CPO) to the Michelin A/S 3+. Was it worth the switch? To put my query in context, I romp occasionally in the mountains but mostly commute in Seattle. Switching from RFTs to Conti A/S Extremes on my E90 was night and day in my experience. Or have the Driveguards advanced to the point where the Michelins offer little extra for my application?
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12-04-2018, 10:52 PM | #74 | |
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Just sort by low price first, then check for A/AA traction, W speed, and 40k warranties. Sure, it's not recommended for hyperspace but you should have a second set for shredding on track days. I hope this helps. |
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12-06-2018, 03:36 AM | #75 |
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Has anyone tried the MPS4S yet ? They are a few bucks more but supposed to be replacing the MPSS.
I was a bit too liberal today with the gas in a corner in 48F weather. The MPSS really doesn't like anthing less than 60F it seems. I can imagine they are useless close to freezing. |
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12-06-2018, 10:45 AM | #76 |
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I have nothing but love for my MPS4's. They get more interesting in the cold but at 40F still have some grip. Tomorrow the winter wheels with AS's go back on.
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12-06-2018, 11:09 AM | #77 | |
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Highly recommend! |
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12-07-2018, 09:28 AM | #79 |
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It's really funny that runflats by far have the highest potential for blowouts with total failures. You constantly read on this forum and the 3/4 series forum about runflat blowouts. A bit ironic considering their purpose.
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12-07-2018, 09:42 AM | #80 | |
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Their utility is dubious, there is more than one way to skin a cat, and RFTs can only account for some of those ways.
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12-15-2018, 09:12 AM | #83 |
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