BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      01-07-2008, 01:48 PM   #1
Pac-Man
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runflats

Whats the issue with them (aside from the fact that they are heavy and expensive)? seems like many want to ditch them
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      01-07-2008, 02:00 PM   #2
semaj
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Quote:
Originally Posted by Pac-Man View Post
Whats the issue with them (aside from the fact that they are heavy and expensive)? seems like many want to ditch them
From what I understand, the run flats are not that heavy. The main grip with the tires is, from my experience from these forums, is that the cornering performance and stability isn't up to par with regular tires.
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      01-07-2008, 02:01 PM   #3
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Yeah, no need for them here. I'll end up going with PS2's and throwing a can of that fix-a-flat in the trunk for emergency use only.
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      01-07-2008, 03:10 PM   #4
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They are damn heavy, with VERY thick sidewalls, which result in extra unsprung weight, rough ride, and aggressive tire wear.

Runflats are getting better, but they still cannot match the ride quality, weight, and stickiness of conventional summer tires.
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      01-07-2008, 06:18 PM   #5
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I'd rather track with flat tires than run-flats. Does the 135i come with RFTs? If they do and I can't change that on my order, they are getting sold on day 1 or saved for winter use or something.
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      01-07-2008, 06:29 PM   #6
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All non-M cars have had runflats for a few years now.

Btw, don't bother attempting to use them in the snow, they are horrible.
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      01-10-2008, 11:59 AM   #7
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Specs haven't been released on the RFT tires as of yet but they are roughly 24lbs each on the front and 27lbs each on the rear.

Looking at other matching sets of these tires the runflats are running about 2lbs heavier (each), front and rear, across brand lines, compared to non-RFT tires.
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      01-10-2008, 12:11 PM   #8
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I can speak from experience having changed from runflats on 18" wheels to normal tyres on 19" wheels. I've kept the OEM wheels and tyres for when I sell the car.

The difference is a quantum leap in improved ride quality despite wider, lower profile rubber; immediately noticeable to driver and passengers. The runflat tyre walls are up to 3 times thicker and heavily reinforced so that the tyre does not collapse when deflated. This means the runflat delivers a bumpier, noisier ride because it has less compliance and also importantly has a major handling trade-off because the stiff sidewall causes the car to bounce and break traction.

Bought a ContiComfortKit in case of punctures - unsure if its sold in US market.
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      01-10-2008, 01:46 PM   #9
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$$$$ to replace
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      01-10-2008, 01:51 PM   #10
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How difficult is it to switch from RFTs to a set of traditional tyres? Will I have to buy a new set of rims, or can I use the OEMs?
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      01-10-2008, 01:56 PM   #11
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Originally Posted by johnny1019 View Post
How difficult is it to switch from RFTs to a set of traditional tyres? Will I have to buy a new set of rims, or can I use the OEMs?
Simple change of tyres on OE rims.
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      01-10-2008, 02:00 PM   #12
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Originally Posted by Rephlex View Post
Simple change of tyres on OE rims.
Okay good, that's what I thought.
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