05-28-2016, 05:06 PM | #1 |
First Lieutenant
96
Rep 337
Posts |
Well, the run-flats are back on...
With the ship carrying my 340i about to dock, I removed the DWSs and remounted the OEM, near-new, run flats. It's hard to comprehend what the hell BMW is thinking by fitting their cars with these toroids of concrete. The ride quality went from quite fine to simply abysmal. Hope those on the 340 aren't as bad!
|
05-28-2016, 06:03 PM | #3 |
First Lieutenant
174
Rep 310
Posts
Drives: 2018 EB F31 2018 LG F80
Join Date: Nov 2009
Location: Ontario
iTrader: (0)
Garage List 2020 BMW M2 CS [9.83]
2021 Porsche 718 Sp ... [8.50] 2021 BMW R1250GSA [0.00] 2014 Boxster S [0.00] 2013 BMW R1200GS [0.00] 2011 1 Series M Coupe [10.00] |
It is simply confounding why 'non run flat' tires are not a no cost option. Mine lasted literally 2000 miles before I hit a pothole and ruined one. I replaced all 4 tires with Pilot Super Sports and the car is actually enjoyable to drive!
B. |
Appreciate
1
|
05-29-2016, 07:52 AM | #4 |
2006 TIME Person Of The Year
9720
Rep 6,445
Posts |
Every time I get a loaner car with RFT I think about all the people that don't realize how much better their car would be with conventional rubber. It's really a massive difference.
__________________
|
Appreciate
1
|
05-29-2016, 08:13 AM | #5 |
Captain
222
Rep 821
Posts |
People assume run flats can be damaged by road hazards more easily then conventional tires. The low profile has lot more to due with damage then RTF vs conventional tire.
|
Appreciate
1
|
05-29-2016, 09:10 AM | #6 |
Private First Class
40
Rep 197
Posts |
Had an '09 Z4 just prior to getting the 435i. Swapped the early gen RFT's out and was very glad for doing so.
But so far on the current gen RFT on the 435i....I am not feeling the same jarring road contact and see little reason to swap them out. Very happy with ride quality. |
Appreciate
0
|
05-29-2016, 09:42 AM | #7 |
Lieutenant General
8297
Rep 16,183
Posts |
+1, and the same goes for the harsh ride. I wouldn't use RFTs with lower than 45 series aspect ratio tires, as there's not enough rubber between the rim and the road to compensate for the increased sidewall stiffness. Even 45 series are marginal. With 50 series and higher you're hard pressed to tell the difference. As for damage, with 40 series and lower you'd best have pothole radar, no matter what the tire.
|
Appreciate
0
|
05-29-2016, 10:09 AM | #8 |
Brigadier General
1435
Rep 4,724
Posts |
What year is your current car? I found a huge difference between my 09 with run flats compared to my 15 with run flats. The new ones are much much better.
__________________
Current: 2021 M340i xDrive
Previous: '18 340i xDrive; '15 335 xDrive; '14 435i xDrive; '09 335 E92 xDrive |
Appreciate
0
|
05-29-2016, 10:18 AM | #9 | |
Private First Class
22
Rep 160
Posts |
Quote:
__________________
Current: 2017 330i xDrive M Sport
Past: 2013 328i xDrive, 2008 335XI 6MT, Legacy SPEC.B, MazdaSpeed6(best of all) |
|
Appreciate
0
|
05-29-2016, 11:54 AM | #11 | |
First Lieutenant
57
Rep 376
Posts |
Quote:
I just had a 328i Loaner with run flats and standard suspension. My 428 GC with the adaptive m and run flats is much much smoother and feels more stable over potholes and uneven road surfaces I run the Pirelli summer run flats - staggered 255 rear 225 front. During the winter I use continental extreme all season uhp non-run flat same 18' wheels. I now have the stock run flats back on. For my preference the summer run flats provide a much more responsive ride because of their firmness. And I run the car in sport plus mode 90% of the time. Having experienced these different combinations, for me it confirms that the adaptive suspension is really a great design even if you are not biased towards a high-performance ride , and in fact makes a bigger difference than the tires.
__________________
2018 M3 Alpine White -gone
2009 128i Auto -gone 2014 128 grand coupe - gone |
|
Appreciate
0
|
05-29-2016, 12:01 PM | #12 |
Major General
124
Rep 5,627
Posts |
|
Appreciate
0
|
05-29-2016, 12:07 PM | #13 | |
Brigadier General
1616
Rep 3,958
Posts |
Quote:
Also, RFTs are significantly heavier which has a noticeable effect upon impact with a pothole. |
|
Appreciate
1
|
05-29-2016, 12:40 PM | #14 |
Lieutenant
122
Rep 436
Posts
Drives: 2016 435i xDrive Gran Coupé
Join Date: Apr 2015
Location: Canada
|
We've driven over a year on our first RFT...no problem yet. Yes the ride is a bit harder (225/40 & 255/35 R19), but we don't mind. As for potholes, we've lost non-RFT tires to those. I'd have to do a long term study to find our if they are less likely to survive our particular driving style...it's an individual thing.
Years ago we lost a non-RFT to sidewall damage...due to a knife slash. This was back in the Separatist days of Québec, and we had Ontario plates. Interestingly, my family has been in La Belle Province since the late 1700s...so we had likely lived there longer than our slasher. |
Appreciate
0
|
05-31-2016, 08:02 AM | #16 | |
First Lieutenant
174
Rep 310
Posts
Drives: 2018 EB F31 2018 LG F80
Join Date: Nov 2009
Location: Ontario
iTrader: (0)
Garage List 2020 BMW M2 CS [9.83]
2021 Porsche 718 Sp ... [8.50] 2021 BMW R1250GSA [0.00] 2014 Boxster S [0.00] 2013 BMW R1200GS [0.00] 2011 1 Series M Coupe [10.00] |
Quote:
B. |
|
Appreciate
0
|
05-31-2016, 09:16 AM | #18 |
Curmudgeon and Pedant
692
Rep 3,488
Posts |
|
Appreciate
0
|
05-31-2016, 09:53 PM | #19 | |
Performance
1
Rep 6
Posts |
Quote:
|
|
Appreciate
0
|
05-31-2016, 10:22 PM | #20 |
Lieutenant General
3189
Rep 10,509
Posts |
I might be in the minority here but i don't mind the rft that much. I actually like the stiff sidewall and appreciate the run flat capability
When i changed the 18" re050a I rft on my z435 to 18" dunlop zii, the ride stiffness was similar (likely because an "extreme" class summer tire has pretty stiff sidewall). |
Appreciate
0
|
06-05-2016, 12:38 PM | #21 |
Enlisted Member
11
Rep 39
Posts |
I recently bought a 2016 wagon with 19" RFT tires. I already have had a flat with these tires, but the dealer and Pirelli replaced it for free. However, what worries me is what to do when taking long trips. RFT are only good for 80km when flat, and if you wind up in a small town, who is going to stock a 19" RFT Pirelli tire to replace the flat one? It also seems like you can NOT repair these tires even if you catch them early and keep them at least semi filled with air.
What do you all do when taking long trips? |
Appreciate
0
|
06-06-2016, 01:55 PM | #22 | |
Captain
222
Rep 821
Posts |
Quote:
|
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|