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2010 2011 BMW 5 Series Forum F10 'Definitive' Winter Tyre Info F10/F11 (with no changing wheels) |
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11-30-2012, 03:13 AM | #45 | |
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As a side note the winter run-flats are softer than the summer tyres at colder temperatures so a better ride as well. I run 18" wheels in the summer, 17" in the winter. HighlandPete |
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11-30-2012, 03:18 AM | #46 | |
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Not often on here because err... I haven't got a 5er.
But keeping in mind the title of this thread particularly "(with no changing wheels)"... Quote:
He had no motive for telling me this other than being helpful and I also heard this from another fitter at another tyre outlet. |
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11-30-2012, 03:57 AM | #48 |
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I'm no expert on tyre construction but from what I understood the inside of the stiffened sidewall can be gouged by the machine as the tyre is removed. Normal tyres give but run flats don't.
It makes sense as the official line on run flats is that if it's punctured you get to where you need to be and then throw it away. |
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11-30-2012, 06:21 AM | #49 | |
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It is a pretty brutal procedure, even with the correct equipment and training. The problem, like running on the tires when flat, and getting a repair, you can't necessarily see the damage. Removal and remounting could do damage and you won't know if the structure has been compromised. The risk factor is increased for future tire failure. I'd certainly not be tempted to remount run-flat tires on a seasonal basis. I wouldn't even do it with normal tires, let alone with run-flats. Plus with dedicated wheels you have the chance to have a decent summer wheel set and an appropriate wheel set for winter driving. For example, a smaller winter rim allows a higher aspect ratio and a narrow tire section for optimum winter performance. HighlandPete |
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11-30-2012, 11:16 AM | #50 | |
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11-30-2012, 12:09 PM | #51 | |
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It is a big subject and often debated. Autocar posted a blog after Steve Sutcliffe found a BMW 1M coupe worked far better on 18" wheels, rather than the 19" from BMW, to see where users put their priorities. Fashion, even with driving compromises, appeared to come first, rather than driving performance. Many willingly endure a worse handling car with poor ride quality just to have a look. I don't personally don't get how users will rather have a look, than optimum tyre performance and the highest degree of safety in all conditions. Perhaps I'm from a dying breed.... maybe. I know there are quite a few motoring journalists/writers who think wheel sizing is getting out of hand, right across the motoring industry, for many reasons. Includes costs, ride, noise, poor chassis dynamics, and it is time to get back to the basics of what wheels and suspension are supposed to do. HighlandPete |
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02-24-2014, 03:13 PM | #52 | |
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03-08-2014, 04:59 PM | #53 |
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I chose 17" rims in the hope of improved ride quality. Sadly, I have to report that the ride in the back of my 528 F10 is utterly dreadful, it feels like your backside is on the tarmac, crunching into every bump, never mind potholes.
Ride is slightly better on non-rft winters but not much. BMW may have heard of springs and shock absorbers but have seemingly decided they're not required. Jaguar do ride comfort much better without sacrificing road holding, but I will never buy one their cars again, but that's another story. |
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