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      01-19-2008, 04:57 PM   #1
CkDedmon
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Do M3's come with RFTs?

Do M3's come with run-flat tires on either the 18" or 19" factory wheels?

It appears that the answer is "no" and you just get the Mobility Kit...kind of surprising considering that BMW provides run-flat tires on the 335.

Then again, I would actually prefer to not have RFTs for ride quality.

Thanks.
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      01-19-2008, 05:04 PM   #2
southlight
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Like you said the answer is No, there's the M mobility kit.

BTW: a search had answered you question.


Best regards, south
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      01-19-2008, 05:07 PM   #3
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Quote:
Originally Posted by CkDedmon View Post
kind of surprising considering that BMW provides run-flat tires on the 335.
Thanks.
bmw also provides a TT 6 cylinder in the 335...does it surprise you that the M3 has a different engine? RFTs have obvious performance limitations and BMW, to my knowledge, has never put RFTs on any M cars.
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      01-19-2008, 05:24 PM   #4
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Quote:
Originally Posted by redmtclimber View Post
RFTs have obvious performance limitations and BMW, to my knowledge, has never put RFTs on any M cars.
That's right, no RFTs for M cars. However I don't see why RFTs should have performance limitations. I have RFTs on my Z4. They are perfect on the track but the downside is that ride comfort suffers, especially if you already have a stiff suspension. E.g. the Z4Ms suspension is stiffer but thanks to the normal tires the ride is still more comfortable than in the regular Z4.

Plus: the RFTs are ridiculously expensive. I'm glad the M3 has cheaper tires so I don't have to worry about tire costs when doing power slides
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      01-19-2008, 05:34 PM   #5
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Originally Posted by swiss_cornholio View Post
However I don't see why RFTs should have performance limitations.
i'm not entirely sure, but i thought that it had to do with the fact that the sidewalls on RFTs are much more rigid than regular tires. you're right that ride comfort suffers too. maybe another member knows more about RFTs vs. regular tires performance wise.
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      01-19-2008, 10:17 PM   #6
sdiver68
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Quote:
Originally Posted by redmtclimber View Post
i'm not entirely sure, but i thought that it had to do with the fact that the sidewalls on RFTs are much more rigid than regular tires. you're right that ride comfort suffers too. maybe another member knows more about RFTs vs. regular tires performance wise.
Stiff sidewalls are good for handling.

RFT's usually put up about the same lap times as their non-RFT brothers.

There is some evidence that RFT's might not be as good for acceleration from a dig.
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      01-19-2008, 10:50 PM   #7
GregW / Oregon
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Runflats

Quote:
Originally Posted by redmtclimber View Post
i'm not entirely sure, but i thought that it had to do with the fact that the sidewalls on RFTs are much more rigid than regular tires. you're right that ride comfort suffers too. maybe another member knows more about RFTs vs. regular tires performance wise.
In 57k miles with my E46 M3 on 19" PS2s, I've had three slow leak punctures, but no "flats" or blowouts. You can repair a normal tire, unlike runflats. That, together with the ride issue, makes me favor this direction. I carry a plug kit and you have a compressor with the MMobility kit. In addition, on trips, I take a space saver spare. I'm happy with this vs. runflats.
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      01-23-2008, 01:57 AM   #8
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Quote:
Originally Posted by redmtclimber View Post
bmw also provides a TT 6 cylinder in the 335...does it surprise you that the M3 has a different engine? RFTs have obvious performance limitations and BMW, to my knowledge, has never put RFTs on any M cars.
good to know..
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