Run-Flats: Get em' outta here!

Midgarr30 · 01-04-2007, 06:15 PM

After reading posts from BMW and Acura forums, I don't think I will be a big fan of run-flats. I hear they wear quicker in comparison to non RFT's. Well, my question is: Has anyone decided to go with normal tires when their RFT's wear out?

I've been driving an R32 for some time w/o a spare tire and no RFT's. I think I might throw on some Eagle F1's (or another well-wearing summer tire) when the RFT's become worn.

I'm also curious to see if any has place non-RFT's on their 335/328 and if the ride has been changed at all.

-Adam

E90Boy · 01-04-2007, 06:20 PM

Been running on regs for over 6 months now. Should of done it sooner.

citkane · 01-04-2007, 06:28 PM

Quote:

Originally Posted by Midgarr30

After reading posts from BMW and Acura forums, I don't think I will be a big fan of run-flats.

This is just my opinion, but don´t worry about the run-flats. I´ve been driving them exclusively for the past 3 1/2 years and they do last just as long for me as standard tires. I don´t find them bad at all.
Here are a couple of pros and cons.

+ blowing a tire at high speed will likely be a lot! safer than losing a standard tire
+ no need to keep a spare (or tire kit), just keep on driving
- the ride will be harsher, although I got used to it quickly
- it appears the run-flats are more sensitive to strong winds

It did take a couple of weeks for me to get used to them, now I see no reason at all to go back to conventional tires.

Mike UK · 01-04-2007, 06:32 PM

they are also more expensive than standard tyres.

personally would rather have had the choice of 1.normal tyres + Spare / spacsaver 2. or runflats.

obLu · 01-04-2007, 07:14 PM

Not too mention that if you get ZSP and you need a rear tire replaced, expect to wait a good long time.

FirstClass · 01-04-2007, 07:17 PM

RFTs = no spare = lighter = faster

Thats all you need to know.

canucklion · 01-04-2007, 09:57 PM

non-RFT lighter than RFTs, ergo, less unsprung weight = faster than RFTs

Quote:

Originally Posted by FirstClass

RFTs = no spare = lighter = faster

Thats all you need to know.

gos · 01-04-2007, 11:16 PM

Quote:

Originally Posted by canucklion

non-RFT lighter than RFTs, ergo, less unsprung weight = faster than RFTs

not for all models of tire

rolling18 · 01-04-2007, 11:24 PM

Quote:

Originally Posted by canucklion

non-RFT lighter than RFTs, ergo, less unsprung weight = faster than RFTs

why do you keep repeating the same answers?

NFS13 · 01-05-2007, 07:07 AM

The ride changes dramatically IMO. The RFT's isolate you from the road, bounces too much over bumps, has less grip as the temp goes down ( get to around 38 degrees with rain and it gets really interesting ). A majority of owners are point A to point B drivers so all of the RFT's safety features are a great thing, that is why there is a big move toward the technology - majority = $ in business.

Jaws · 01-05-2007, 10:09 AM

Quote:

Originally Posted by gos

not for all models of tire

All models of non-RFT that I have seen have been lighter than the RFT version. Do you have any examples?

Jaws · 01-05-2007, 10:12 AM

Quote:

Originally Posted by FirstClass

RFTs = no spare = lighter = faster

Thats all you need to know.

Too simplistic. Read up on unsprung weight.

NFS13 · 01-05-2007, 11:03 AM

Quote:

Originally Posted by Jaws

Too simplistic. Read up on unsprung weight.

Exactly! see address below.

http://en.wikipedia.org/wiki/Unsprung_weight

bnj · 01-05-2007, 11:48 AM

Google up some more scientific articles and you will be able to calculate what is the effect of the unsprung weight due to the differences in the weights of tires of the same size. Immaterial. However, just to be a bit of a perfectionist, I have 17 inch wheels myself as those weigh less although they have more weight on the tires due to the more material (high profile). The total weight is less with smaller diameter wheels. The exception being forged wheels that weigh less in which case bigger wheels do not add the total weight. However, the money to buy forged wheels is much better spent elsewhere.

Run flats are faster in dry and non run flats are faster in wet. Both by large margins.

E36325is · 01-05-2007, 12:25 PM

Quote:

Originally Posted by Midgarr30

After reading posts from BMW and Acura forums, I don't think I will be a big fan of run-flats. I hear they wear quicker in comparison to non RFT's. Well, my question is: Has anyone decided to go with normal tires when their RFT's wear out?

I've been driving an R32 for some time w/o a spare tire and no RFT's. I think I might throw on some Eagle F1's (or another well-wearing summer tire) when the RFT's become worn.

I'm also curious to see if any has place non-RFT's on their 335/328 and if the ride has been changed at all.

-Adam

I will dump my RFT tyres on the day of delivery! I will not live with them for longer than an hour!

qroc · 01-05-2007, 12:29 PM

I've got a RF winter tire and wheel set on now, when its warmer I'm ditching the stock RFTs and am gonna keep either a spare or a repair kit just in case.

My reasons are: I've spent too much on the car to have the handling nerfed a bit by RFTs. Also, the RFTs don't seem to be available readily. Lastly they cost alot. And I can just keep a winter tire as a spare I'd think. Or a kit.

vladinecko · 01-05-2007, 12:38 PM

if you take away the "lighter & faster" factor which, with entry level class BMW, most people really don't care about, i don't really see the practicality of them. yes, if they blow up you can still drive on them for 150 miles. BUT if you really look at it, with regular tires, even if you don't have a spare and need to call a two truck, it may still cost you less to have your car towed and replace the tire than cost of one RFT alone. if you get a nail in a RFT you need to replace it. that's at least $255 for the price of the tire + labor + tax. you can almost get a set of 4 regular and good tires for the price of one RFT. that is simply ridiculous!!

i'm just extremely bitter about those damn things right now because i have to replace them all after only 9000 miles and all i hear from the manufacturer that those tires are meant to perform, not to last. fuck that shit!

:mad:

NFS13 · 01-05-2007, 01:29 PM

Quote:

Originally Posted by bnj

Google up some more scientific articles and you will be able to calculate what is the effect of the unsprung weight due to the differences in the weights of tires of the same size. Immaterial. However, just to be a bit of a perfectionist, I have 17 inch wheels myself as those weigh less although they have more weight on the tires due to the more material (high profile). The total weight is less with smaller diameter wheels. The exception being forged wheels that weigh less in which case bigger wheels do not add the total weight. However, the money to buy forged wheels is much better spent elsewhere.

Run flats are faster in dry and non run flats are faster in wet. Both by large margins.

So what is your point in the first part of the post?

The second comment about RFT being faster in the dry is a bit off the wall IMO.

bnj · 01-07-2007, 04:56 PM

Quote:

Originally Posted by NFS13

So what is your point in the first part of the post?

The second comment about RFT being faster in the dry is a bit off the wall IMO.

I'm saying that the difference in tire weights is meaningless. As is the weight of a spare.
RFT being faster in the dry is not a question of opinion. It's been tested.

NFS13 · 01-07-2007, 05:34 PM

Quote:

Originally Posted by bnj

I'm saying that the difference in tire weights is meaningless. As is the weight of a spare.
RFT being faster in the dry is not a question of opinion. It's been tested.

If you happen to have any links to that testing I'd be very interested in reading up on that. Thanks in advance!

FirstClass · 01-07-2007, 07:47 PM

Quote:

Originally Posted by Jaws

Too simplistic. Read up on unsprung weight.

I know what unsprung weight is.

ICALL · 01-07-2007, 09:05 PM

Quote:

Originally Posted by NFS13

If you happen to have any links to that testing I'd be very interested in reading up on that. Thanks in advance!

As would I. I was under the impression non-RFT would provide better traction hence better launch hence faster. Unless you're talking about the weight thingy. Then my response is I'm a noob.

I will say that potholes suck with RFT. Sports package on the 335i coupe and if I hit a sewer cap that's set slightly below the pavement(not flush with the road), I get a BANG, and the disk in the CD sometimes skips. Once I thought I bent the rim. After reading some posts, I'm starting to get concerned about bubbles from the force of impact.

Someone educate me if its not the RFT and is the low profiles instead. I'm now steering around sewer caps. The people driving around me must think I'm nuts or have OCD.

01-04-2007, 06:15 PM	#1
Midgarr30 Destroying mummies 3 Rep 26 Posts Drives: E90 SG 335i Join Date: Dec 2006 Location: LI, NY iTrader: (0)	Run-Flats: Get em' outta here! After reading posts from BMW and Acura forums, I don't think I will be a big fan of run-flats. I hear they wear quicker in comparison to non RFT's. Well, my question is: Has anyone decided to go with normal tires when their RFT's wear out? I've been driving an R32 for some time w/o a spare tire and no RFT's. I think I might throw on some Eagle F1's (or another well-wearing summer tire) when the RFT's become worn. I'm also curious to see if any has place non-RFT's on their 335/328 and if the ride has been changed at all. -Adam __________________ Please, don't eat babies.
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01-04-2007, 06:20 PM	#2
E90Boy Captain 35 Rep 674 Posts Drives: 14 F33 Join Date: Aug 2005 Location: Boston iTrader: (4)	Been running on regs for over 6 months now. Should of done it sooner.
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01-04-2007, 06:32 PM	#4
Mike UK Private First Class 7 Rep 196 Posts Drives: Le mans Blau e92 Join Date: Apr 2006 Location: UK iTrader: (0)	they are also more expensive than standard tyres. personally would rather have had the choice of 1.normal tyres + Spare / spacsaver 2. or runflats.
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01-04-2007, 07:14 PM	#5
obLu Major 50 Rep 1,159 Posts Drives: 330i 6MT ZSP Join Date: Jun 2005 Location: Kirkland, WA, USA iTrader: (1)	Not too mention that if you get ZSP and you need a rear tire replaced, expect to wait a good long time.
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01-05-2007, 07:07 AM	#10
NFS13 Car Junkie 21 Rep 1,279 Posts Drives: 335is / R8 Join Date: Sep 2006 Location: PA iTrader: (1) Garage List 2012 BMW X6 [0.00] 2012 Porsche Cayman R [10.00] 2011 Audi R8 V10 [7.34]	The ride changes dramatically IMO. The RFT's isolate you from the road, bounces too much over bumps, has less grip as the temp goes down ( get to around 38 degrees with rain and it gets really interesting ). A majority of owners are point A to point B drivers so all of the RFT's safety features are a great thing, that is why there is a big move toward the technology - majority = $ in business.
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01-05-2007, 11:48 AM	#14
bnj Banned 14 Rep 1,137 Posts Drives: e92 335i Join Date: Nov 2006 Location: Helsinki iTrader: (0)	Google up some more scientific articles and you will be able to calculate what is the effect of the unsprung weight due to the differences in the weights of tires of the same size. Immaterial. However, just to be a bit of a perfectionist, I have 17 inch wheels myself as those weigh less although they have more weight on the tires due to the more material (high profile). The total weight is less with smaller diameter wheels. The exception being forged wheels that weigh less in which case bigger wheels do not add the total weight. However, the money to buy forged wheels is much better spent elsewhere. Run flats are faster in dry and non run flats are faster in wet. Both by large margins.
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01-05-2007, 12:29 PM	#16
qroc Private 2 Rep 71 Posts Drives: 2007 335i Join Date: Apr 2006 Location: Bristow, VA iTrader: (0)	I've got a RF winter tire and wheel set on now, when its warmer I'm ditching the stock RFTs and am gonna keep either a spare or a repair kit just in case. My reasons are: I've spent too much on the car to have the handling nerfed a bit by RFTs. Also, the RFTs don't seem to be available readily. Lastly they cost alot. And I can just keep a winter tire as a spare I'd think. Or a kit. __________________ 2007 335i Coupe Jet Black/Black, Premium, Sport, Satellite, Brushed Aluminum
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01-05-2007, 12:38 PM	#17
vladinecko Brigadier General 281 Rep 3,924 Posts Drives: '11 E92 M3 Join Date: Jun 2005 Location: Bay Area, CA iTrader: (1) Garage List 2011 BMW M3 [9.00] 2008 BMW 335i [0.00] 2006 BMW 330i [0.00] 1994 BMW 325i [0.00]	if you take away the "lighter & faster" factor which, with entry level class BMW, most people really don't care about, i don't really see the practicality of them. yes, if they blow up you can still drive on them for 150 miles. BUT if you really look at it, with regular tires, even if you don't have a spare and need to call a two truck, it may still cost you less to have your car towed and replace the tire than cost of one RFT alone. if you get a nail in a RFT you need to replace it. that's at least $255 for the price of the tire + labor + tax. you can almost get a set of 4 regular and good tires for the price of one RFT. that is simply ridiculous!! i'm just extremely bitter about those damn things right now because i have to replace them all after only 9000 miles and all i hear from the manufacturer that those tires are meant to perform, not to last. fuck that shit! :mad: __________________ 2011 E92 M3 - IB/Beige/Sycamore Wood/6MT/EDC/ZPP2/Nav/PDC/Heated Seats/iPod-USB/Enh. Audio 2008 E92 335i - Montego Blue/Black/Gray Poplar/6MT/ZPP/ZSP/Nav/PDC/Heated Seats/HDRadio/iPod-USB - *Sold* 2006 E90 330i - Mystic Blue/Black/Aluminum/6MT/ZPP/iDrive/PDC/Heated Seats/Sat. Prep - *Sold* 1994 E36 325i - Boston Green/Beige/Automatic/ZPP/Heated Seats/Premium Sound - *Sold*
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