02-02-2013, 08:52 PM | #23 | |
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cheers vern Last edited by vern; 02-02-2013 at 08:58 PM.. |
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02-02-2013, 09:36 PM | #24 | ||
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02-02-2013, 09:57 PM | #25 | |||
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This is one of those things where it's tough to prove. BMW quotes the x drive at 4.8s to 60 with the run flats. 4.8 is more than adequate for most folks. If you can find a 335 x drive doing the deed in say 4.2s, which is impossible I guess so I will lower it to 4.6 then you have a point that rfts are robbing performance. Most publications have reported braking and lateral g numbers in line with the best in the segment, the ATS for example. The burden of proof is upon you sir
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02-03-2013, 12:19 AM | #26 | |
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02-03-2013, 08:50 AM | #27 |
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02-03-2013, 10:13 AM | #29 |
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RFT have a different turn-in feel and address road undulations less well than conventional tires. This is easy to feel at any speed. However, most people do not notice/do not care.
An RFT is a hazard to rims only when inflated to a higher pressure and the very stiff. They are less forgiving on potholes as a result. An RFT is no more dangerous to a rim once deflated than a normal tire, less so in fact as the stiff sidewall will help protect the rim. I intensely dislike RFT and run conventional tires. I assume the little risk that I may have a flat and will be accordingly inconvenienced. Others see the equation differently and use RFT. Neither side is "right;" it is merely a preference. Last edited by Elk; 02-03-2013 at 11:32 AM.. |
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02-03-2013, 11:30 AM | #30 | |
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02-03-2013, 12:41 PM | #32 | |
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I agree that 19" wheels (or larger) make no sense; they are too vulnerable and too heavy !
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02-03-2013, 01:22 PM | #33 |
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I did some digging, apparently if you run an OEM BMW suspension you should run RFTs because the suspension was built with that in mind. After you make adjustments to the suspension though all bets are off and its preference.
The cons to RFTS: mostly the life of the tire is reduced (up to half of regular tire life) and they are more costly than conventional tires. They are also inherently heavier than a conventional tire. extra weight will lead to reduced performance through turns (don't track my car but I drive a ton of back roads and lay into her pretty hard) and the thicker sidewall will damage larger wheels easier than regular tires. The cons to conventional tires: they leave you in a bind if you didn't bring a spare and don't have AAA. Not BMW endorsed w/oem non-sport suspension. Google and do some reading if you disagree but thats what I've gathered...
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02-03-2013, 01:43 PM | #34 |
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Fun flats as i like to call them dont have as much grip. Thats what i feel. Im no expert but a stiffer sidewall may be the reason.
My car on the track was significantly better with some hankook v12s. I just switched out the summer funflats on the 135i as well and i like them more already as well. The oems were too hard and even cracked a tpms. |
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02-03-2013, 02:05 PM | #35 |
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Whatever you do, you should be aware that a special machine is needed to install run flat tires. Not all places, for example the BJ's closest to me, several service stations, and others, have that machine. My local BMW store is, in fact quite competitive on tires. I bought a run flat for $250 from them and they installed it for no additional charge. Several years ago, they were nowhere near as reasonably priced, charging around $400 dollars for the tire.
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02-03-2013, 02:10 PM | #36 | |
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When this happened to me at 5K miles, I even got a free loaner while the tire was being ordered.
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02-03-2013, 02:11 PM | #37 |
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02-03-2013, 02:19 PM | #38 |
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I don't think allot of people realize is that RF tech as improved considerable over the years. Looking up the specs for the stock run flats on the F30 are quite good and give nearly the same Milage life as normal tires. Your only concern with run flats should be ride quality and track performance on rims larger than 18. 19s Are a hard ride + RF = even harder. Ideally the average driver will be perfectly fine with RF flats. Theres a 5th gear video on youtube that shows a 5 series on a track racing with deflated run flats. Tiff was genuinely impressed.
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02-03-2013, 03:02 PM | #39 | |
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AMAZING! The dealer fucked me? And you wonder why I don't want to deal with them? Stay tuned... |
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02-04-2013, 06:02 PM | #40 |
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This thread is what I need at the moment
I just broke in my 2013 335xi M sport with 19" 403M wheels. havent pushed it much at all (1220 miles on it now). I think i may have hit a pot hole some where and the side wall has a bulge. Took it to the dealer, told me i have to replace the tire and quoted me 530$ with labor... Some one please provide some insight into what bridge stone covers. 1200 miles seems like nothing and I have driven it properly. I am frustrated right now and don't know if I should shell out 500$ for a tire or replace all 4 tires with regular tires and buy an after market spare |
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02-04-2013, 06:12 PM | #41 | |
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And your dealer probably doesn't read the tire warranty CD either.
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02-04-2013, 06:14 PM | #42 | |
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