Up sizing rear tyres only??

135iYES · 01-05-2014, 04:08 PM

Hi, I have a totally standard 135i set-up (runflats) 215/40/18 front and 245/35/18 rear. And only need to replace my rear tyres and want to go with 255/35/18 in the rear. Would there be any problems with handling or does anyone run 215/40/18 front and 255/35/18 rear. Would appreciate some advice. Thanks.

ttbullet · 01-05-2014, 04:45 PM

Quote:

Originally Posted by 135iYES

Hi, I have a totally standard 135i set-up (runflats) 215/40/18 front and 245/35/18 rear. And only need to replace my rear tyres and want to go with 255/35/18 in the rear. Would there be any problems with handling or does anyone run 215/40/18 front and 255/35/18 rear. Would appreciate some advice. Thanks.

Looking for some answers on the same issue

mabutler308@yahoo.com · 01-05-2014, 05:02 PM

If you look up combinations on TireRack, it actually recommends 255 rear and 215 front... so I'm guessing this isn't an issue. I was thinking of doing the same thing, but will probably go ahead and upsize my front tires too.

Bimmer-Bob · 01-05-2014, 05:05 PM

The car will understeer a little more.

Chunner · 01-05-2014, 06:45 PM

Quote:

Originally Posted by 135iYES

Hi, I have a totally standard 135i set-up (runflats) 215/40/18 front and 245/35/18 rear. And only need to replace my rear tyres and want to go with 255/35/18 in the rear. Would there be any problems with handling or does anyone run 215/40/18 front and 255/35/18 rear. Would appreciate some advice. Thanks.

How about 265/35/18 on stock rims? Any fitment issues?

m4xm1l10n · 01-05-2014, 10:15 PM

No issues what so ever, it will be -1% negative out back vs +1% positive up front when you run stock 245/35/18 . Speed rotation matches perfectly .

m4xm1l10n · 01-05-2014, 10:20 PM

Use this

http://www.tacomaworld.com/forum/tir...0r18-255-35r18

135iYES · 01-05-2014, 10:35 PM

Thanks for all of the responses, doesn't seem to be much difference going by the tire size calculator. I will probably go for the 255/. It would be good to hear from someone who has been running this setup for a while.

fboutlaw · 01-06-2014, 01:15 AM

Quote:

Originally Posted by 135iYES

Thanks for all of the responses, doesn't seem to be much difference going by the tire size calculator. I will probably go for the 255/. It would be good to hear from someone who has been running this setup for a while.

Why wouldn't you upsize the fronts as well?

You can do 255 rear no problem. 225 front is no issue. I think 235/40's fit on the front as well, but they're really tall.

135iYES · 01-06-2014, 01:48 AM

Quote:

Originally Posted by fboutlaw

Why wouldn't you upsize the fronts as well?

You can do 255 rear no problem. 225 front is no issue. I think 235/40's fit on the front as well, but they're really tall.

My fronts still have 80% tread on them and new RFT for the front are about $400 each here in Australia. I can get a set of used 255/35/18 RFT for the rear with 80% for $200 each. Hence the question.

fboutlaw · 01-06-2014, 02:52 AM

Quote:

Originally Posted by 135iYES

My fronts still have 80% tread on them and new RFT for the front are about $400 each here in Australia. I can get a set of used 255/35/18 RFT for the rear with 80% for $200 each. Hence the question.

Got it. You'll have no issues.

VMRWheels · 01-06-2014, 02:53 PM

Quote:

Originally Posted by Bimmer-Bob

The car will understeer a little more.

+1

You will experience more understeer.

01-05-2014, 04:08 PM	#1
135iYES Enlisted Member 3 Rep 42 Posts Drives: 135I VERT Join Date: Mar 2011 Location: NSW iTrader: (0)	Up sizing rear tyres only?? Hi, I have a totally standard 135i set-up (runflats) 215/40/18 front and 245/35/18 rear. And only need to replace my rear tyres and want to go with 255/35/18 in the rear. Would there be any problems with handling or does anyone run 215/40/18 front and 255/35/18 rear. Would appreciate some advice. Thanks.
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01-05-2014, 05:02 PM	#3
mabutler308@yahoo.com Enlisted Member 0 Rep 34 Posts Drives: 2013 i35is, Carbon Black Join Date: Dec 2012 Location: Charlotte, NC iTrader: (0) Garage List 2013 BMW 135is Coupe [0.00]	If you look up combinations on TireRack, it actually recommends 255 rear and 215 front... so I'm guessing this isn't an issue. I was thinking of doing the same thing, but will probably go ahead and upsize my front tires too. __________________ 2013 135is 7DCT \| Carbon Black \| Black Boston Leather w/ Blue Stitching\| M-Sport \| BMW Performance Exhaust \| JB4 tuning \| AFE Intake
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01-05-2014, 05:05 PM	#4
Bimmer-Bob ! 693 Rep 3,266 Posts Drives: 2010 128i Join Date: Feb 2010 Location: Anacortes, WA iTrader: (4) Garage List 2010 BMW 128i (E82) [9.25]	The car will understeer a little more. __________________ ____________________________ My Build Thread
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01-05-2014, 10:15 PM	#6
m4xm1l10n Private First Class 8 Rep 178 Posts Drives: 10 M-Sport 135i Join Date: Nov 2013 Location: GA iTrader: (1)	No issues what so ever, it will be -1% negative out back vs +1% positive up front when you run stock 245/35/18 . Speed rotation matches perfectly .
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01-05-2014, 10:20 PM	#7
m4xm1l10n Private First Class 8 Rep 178 Posts Drives: 10 M-Sport 135i Join Date: Nov 2013 Location: GA iTrader: (1)	Use this http://www.tacomaworld.com/forum/tir...0r18-255-35r18
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01-05-2014, 10:35 PM	#8
135iYES Enlisted Member 3 Rep 42 Posts Drives: 135I VERT Join Date: Mar 2011 Location: NSW iTrader: (0)	Thanks for all of the responses, doesn't seem to be much difference going by the tire size calculator. I will probably go for the 255/. It would be good to hear from someone who has been running this setup for a while.
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