Anyone moved from 19" run flats to 19" non run flats?

SCBMW02 · 03-20-2013, 01:29 PM

I switched out the RFTs and upsized to Conti Extreme DWs 235 35-19 and 275 30-19. Big improvement in every way. Bought an M Mobility kit for $150 just in case.

Rafale · 03-20-2013, 04:02 PM

Got my tires early and installed. It makes a world of difference. A lot of the rattle disappeared. The car is smoother and has less understeer. Makes me wonder if BMW even designed or tested the car with EFTs. Went 235/35/19 f and 275/30/19 rear.

dr_mikee · 03-20-2013, 05:31 PM

Quote:

Originally Posted by SCBMW02

I switched out the RFTs and upsized to Conti Extreme DWs 235 35-19 and 275 30-19. Big improvement in every way. Bought an M Mobility kit for $150 just in case.

Are you happy with those Tires (size wise)? They're not too big?

Rafale · 03-20-2013, 05:39 PM

Quote:

Originally Posted by dr_mikee

Are you happy with those Tires (size wise)? They're not too big?

I know this is a concern of many but no they are not too big. They seem to be the correct size for the car actually and the OEM tires are too small.

dr_mikee · 03-20-2013, 05:46 PM

Quote:

Originally Posted by Rafale

I know this is a concern of many but no they are not too big. They seem to be the correct size for the car actually and the OEM tires are too small.

Fair enough...I wonder if them (all seasons) being wider hurts their winter performance?

Rafale · 03-20-2013, 05:55 PM

Depends on what specifically you are referring to. In the snow, having wider tires is a bad thing. So winter tires are generally taller (with smaller wheels) and narrower. As all season, in wet conditions, it should not hurt.

dr_mikee · 03-20-2013, 06:01 PM

Quote:

Originally Posted by Rafale

Depends on what specifically you are referring to. In the snow, having wider tires is a bad thing. So winter tires are generally taller (with smaller wheels) and narrower. As all season, in wet conditions, it should not hurt.

Cool..thanks for the info

cwotoddgood · 03-20-2013, 06:05 PM

Lots of good info (especially relating to the all-seasons.) I am leaning towards the Conti All-Seasons and dropping the run-flats.....all aimed at enjoying the Zed even on those cooler, wetter days too!

dr_mikee · 03-20-2013, 06:13 PM

Quote:

Originally Posted by cwotoddgood

Lots of good info (especially relating to the all-seasons.) I am leaning towards the Conti All-Seasons and dropping the run-flats.....all aimed at enjoying the Zed even on those cooler, wetter days too!

Haha same here... either continentals or generals

Pacemaker1000 · 03-20-2013, 06:29 PM

Have you guys settled on pressures for non rft?

dr_mikee · 03-20-2013, 06:46 PM

Quote:

Originally Posted by Rafale

Depends on what specifically you are referring to. In the snow, having wider tires is a bad thing. So winter tires are generally taller (with smaller wheels) and narrower. As all season, in wet conditions, it should not hurt.

This might be a dumb question but is there a reason we have to stick to the 275/30 versus like a 275/40 for the back wheels...I know that that number denotes sidewall height and i thought a higher sidewall might be better for less pothole incidents??

Rafale · 03-20-2013, 07:02 PM

Hmm that could be too big and rub the wheel well. Increasing the width also increase the sidewall height as the second number is the width to height ratio.
Someone I think went more exotic on the tire size on this forum. I can't remember who.

Mr. ///M3 RD · 03-20-2013, 07:15 PM

Quote:

Originally Posted by cwotoddgood

Lots of good info (especially relating to the all-seasons.) I am leaning towards the Conti All-Seasons and dropping the run-flats.....all aimed at enjoying the Zed even on those cooler, wetter days too!

I have Conti All-Seasons on our C350 it's our DD and I am very happy with them. If and when I switch back to a Z it will have Conti All-Seasons all around since on good dry winter weather days I like to take my toy for a ride.

When my M3 needs new shoes I will to investigate Conti All-Seasons Performance tires.

BTW someone mentioned 11K low performance for the tires ... it all depends (as we all know) how we drive our car.

HerrK · 03-20-2013, 07:20 PM

Quote:

Originally Posted by jparnes1

Herr K, I don't know how you got 22k out of your OEM rears. My rears were bald with cord showing through at 11K and it sounds like you drive a lot harder than me.

Both of my rears were replaced - one at 4k and the other at 6k due to nails. Thank goodness for the tire & wheel insurance. So in reality I stretched 15K from the rear replacements. I babied it alot more with the RFT's to avoid back injury and the 296 cracking issue. One day I noted both rear rims had cracked. They were replaced with the new design (wheel & tire insurance again paid off). Shortly after replacement of the rear wheels I ditched the RFT's and had the non RFT PSS installed.

So I'm into the PSS at about 1K miles and I drive the heck out of it because it goes where I point it, no more understeer plus I don't have to worry about back injuries. Running 235/40x19 (F) and 265/35X19 (R) at 36 and 40 psi respectively. An occasional scuff on the frt wheel well liners during full wheel lock parking lot manuvers. No scuffing on the rears. Next buy I will drop the front down to a 225/40x19. Speedo is now 1 mph slow at 80-100 mph to GPS versus 4 mph optomistic with the stock size RFT's.

HerrK · 03-20-2013, 07:26 PM

Quote:

Originally Posted by dr_mikee

This might be a dumb question but is there a reason we have to stick to the 275/30 versus like a 275/40 for the back wheels...I know that that number denotes sidewall height and i thought a higher sidewall might be better for less pothole incidents??

A lot depends on if your talking an 18" or a 19" wheel. It will never work with a 19". You might get away with it with an 18".

Rafale · 03-20-2013, 07:38 PM

ha! that was HerrK who has put the huge tires.
See the overall diameters

Front:
OEM 225/35x19 25.2"
HerrK's 235/40x19 26.4"
Mine 235/35x19 25.48"

Rear
OEM 255/30x19 25.02"
HerrK's 265/35x19 26.3"
Mine 275/30x19 25.5"

I went 0.2-0.5" wider diameter while HerrK went almost a whole 1.5"

HerrK · 03-20-2013, 11:35 PM

Quote:

Originally Posted by Rafale

ha! that was HerrK who has put the huge tires.
See the overall diameters

Front:
OEM 225/35x19 25.2"
HerrK's 235/40x19 26.4"
Mine 235/35x19 25.48"

Rear
OEM 255/30x19 25.02"
HerrK's 265/35x19 26.3"
Mine 275/30x19 25.5"

I went 0.2-0.5" wider diameter while HerrK went almost a whole 1.5"

Although bigger is not always better. For handling my thoughts run with the other German brand and I like their look. A couple of Porsche examples (Boxster S & Cayman S). Porsche doesn't mount rubber bans on their wheels. Although I never checked before I bought my tires.

8 J x 19-inch Boxster S alloy wheels with 235/40 ZR 19 performance summer tires front, 9.5 J x 19-inch Boxster S alloy wheels with 265/40 ZR 19 performance summer tires rear.
8 J x 19-inch Cayman S alloy wheels with 235/40 ZR 19 performance summer tires at front, 9.5 J x 19-inch Cayman S alloy wheels with 265/40 ZR 19 performance summer tires at rear

VailM3 · 03-21-2013, 12:14 AM

Quote:

Originally Posted by morfinx

I thought stock is 225/35R19 front and 255/30R19 rear?

you are right i typed it wrong its 30 not 55

dr_mikee · 03-21-2013, 01:23 AM

Quote:

Originally Posted by HerrK

Although bigger is not always better. For handling my thoughts run with the other German brand and I like their look. A couple of Porsche examples (Boxster S & Cayman S). Porsche doesn't mount rubber bans on their wheels. Although I never checked before I bought my tires.

8 J x 19-inch Boxster S alloy wheels with 235/40 ZR 19 performance summer tires front, 9.5 J x 19-inch Boxster S alloy wheels with 265/40 ZR 19 performance summer tires rear.
8 J x 19-inch Cayman S alloy wheels with 235/40 ZR 19 performance summer tires at front, 9.5 J x 19-inch Cayman S alloy wheels with 265/40 ZR 19 performance summer tires at rear

so you think we can run this same Porsche S setup with our wheels and tires?

Rafale · 03-21-2013, 01:33 AM

Quote:

Originally Posted by dr_mikee

so you think we can run this same Porsche S setup with our wheels and tires?

I'd be surprised if the rear did not rub at this size. HerrK already said his front are currently this size and they scuff the wheel well during turns.
It isn't so much the wheels cannot handle the size it is the wheel well which can potentially rub

VailM3 · 03-21-2013, 04:14 AM

I had new set of PSS put on this morning and the decision was easy on size. In Switzerland if you want to go outside of what stock offers you need to get paperwork done and register it with the authorities which made it easy to tell the sales guys to just keep it stock 225/35/19 and 255/30/19

Only drove 5 miles home but it was noticeably quieter and absorbed bumps much better than the RFT it replaced.

Rafale · 03-21-2013, 09:53 AM

I was looking at sizing, and knowing that my speedo is off by about 3% high, An increase of 3% would correct it.
Going 235/35 and 275/30 would correct by 2% (increase diameter by increasing width)
Going 225/40 and 255/35 would correct by 4% (by increasing ratio)

For looks I think the wider are better. Plus they ad rim protection.
I think the higher ratios are cheaper.

03-20-2013, 01:29 PM	#23
SCBMW02 Second Lieutenant 124 Rep 237 Posts Drives: 2019 X5 40i and 2022 Z4 M40i Join Date: Feb 2008 Location: Florence,South Carolina iTrader: (0) Garage List 2022 BMW Z4 M40i [0.00] 2019 BMW X5 40i [0.00]	I switched out the RFTs and upsized to Conti Extreme DWs 235 35-19 and 275 30-19. Big improvement in every way. Bought an M Mobility kit for $150 just in case.
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03-20-2013, 04:02 PM	#24
Rafale Zed Quatre 24 Rep 410 Posts Drives: '11 Z4 35is & '11 535xi GT Join Date: Jun 2010 Location: Portland, OR. USA iTrader: (1) Garage List 2011 535i GT xDrive [0.00] 2011 Z4 35is [7.00]	Got my tires early and installed. It makes a world of difference. A lot of the rattle disappeared. The car is smoother and has less understeer. Makes me wonder if BMW even designed or tested the car with EFTs. Went 235/35/19 f and 275/30/19 rear. __________________
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03-20-2013, 05:55 PM	#28
Rafale Zed Quatre 24 Rep 410 Posts Drives: '11 Z4 35is & '11 535xi GT Join Date: Jun 2010 Location: Portland, OR. USA iTrader: (1) Garage List 2011 535i GT xDrive [0.00] 2011 Z4 35is [7.00]	Depends on what specifically you are referring to. In the snow, having wider tires is a bad thing. So winter tires are generally taller (with smaller wheels) and narrower. As all season, in wet conditions, it should not hurt. __________________
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03-20-2013, 06:05 PM	#30
cwotoddgood Chief 0 Rep 3 Posts Drives: 2013 128i w/ M-sport package Join Date: Sep 2011 Location: New York iTrader: (0)	Lots of good info (especially relating to the all-seasons.) I am leaning towards the Conti All-Seasons and dropping the run-flats.....all aimed at enjoying the Zed even on those cooler, wetter days too!
	Appreciate 0 Quote

03-20-2013, 06:29 PM	#32
Pacemaker1000 Private 13 Rep 90 Posts Drives: 430i GC Join Date: Nov 2012 Location: Uk iTrader: (0)	Have you guys settled on pressures for non rft?
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03-20-2013, 07:02 PM	#34
Rafale Zed Quatre 24 Rep 410 Posts Drives: '11 Z4 35is & '11 535xi GT Join Date: Jun 2010 Location: Portland, OR. USA iTrader: (1) Garage List 2011 535i GT xDrive [0.00] 2011 Z4 35is [7.00]	Hmm that could be too big and rub the wheel well. Increasing the width also increase the sidewall height as the second number is the width to height ratio. Someone I think went more exotic on the tire size on this forum. I can't remember who. __________________
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03-20-2013, 07:38 PM	#38
Rafale Zed Quatre 24 Rep 410 Posts Drives: '11 Z4 35is & '11 535xi GT Join Date: Jun 2010 Location: Portland, OR. USA iTrader: (1) Garage List 2011 535i GT xDrive [0.00] 2011 Z4 35is [7.00]	ha! that was HerrK who has put the huge tires. See the overall diameters Front: OEM 225/35x19 25.2" HerrK's 235/40x19 26.4" Mine 235/35x19 25.48" Rear OEM 255/30x19 25.02" HerrK's 265/35x19 26.3" Mine 275/30x19 25.5" I went 0.2-0.5" wider diameter while HerrK went almost a whole 1.5" __________________
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03-21-2013, 04:14 AM	#43
VailM3 Captain 61 Rep 766 Posts Drives: 2011 Z4 35is Join Date: Jan 2013 Location: Geneva Switzerland iTrader: (0)	I had new set of PSS put on this morning and the decision was easy on size. In Switzerland if you want to go outside of what stock offers you need to get paperwork done and register it with the authorities which made it easy to tell the sales guys to just keep it stock 225/35/19 and 255/30/19 Only drove 5 miles home but it was noticeably quieter and absorbed bumps much better than the RFT it replaced.
	Appreciate 0 Quote

03-21-2013, 09:53 AM	#44
Rafale Zed Quatre 24 Rep 410 Posts Drives: '11 Z4 35is & '11 535xi GT Join Date: Jun 2010 Location: Portland, OR. USA iTrader: (1) Garage List 2011 535i GT xDrive [0.00] 2011 Z4 35is [7.00]	I was looking at sizing, and knowing that my speedo is off by about 3% high, An increase of 3% would correct it. Going 235/35 and 275/30 would correct by 2% (increase diameter by increasing width) Going 225/40 and 255/35 would correct by 4% (by increasing ratio) For looks I think the wider are better. Plus they ad rim protection. I think the higher ratios are cheaper. __________________
	Appreciate 0 Quote