235/40 or 245/40 on 18s

Patsfan123 · 03-22-2010, 11:27 PM

My rims are arriving tomorrow and now I need to decide on a tire. I am definitely getting the Conti DWS but I need to decide whether to get 235/40 or 245/40. The rim size is 18x8.5 et 38. I don't want to worry about rubbing and don't plan on using any spacers. I also want to be pothole resistant.

Arustik1 · 03-23-2010, 12:10 AM

Go big or go home

-D

JeffL · 03-23-2010, 07:25 AM

235/40. The 245/40 is too tall, too much of a change over stock, JMHO though. Spacers in the back wouldn't hurt anything.

Hedges · 03-23-2010, 08:02 AM

Go big or go home

MassBimmer · 03-23-2010, 08:24 AM

I have 235/40 Conti DWS on my 18x8.5...it's a very rounded sidewall so it runs on the smaller side...I still like the fitment though

marcel b · 03-23-2010, 08:26 AM

why not 245x35?

Patsfan123 · 03-23-2010, 12:40 PM

Stock is 25.0" Diameter/4.0" Sidewall
235/40 25.4" Diameter/3.7" Sidewall 1.7% slower
245/40 25.7" Diameter/3.9" Sidewall 3.0% slower
245/35 24.8" Diameter/3.4" Sidewall 0.9% faster

I wanted 245 for the extra grip and wanted 40 sidewall so I would have nearly the same amount of sidewall coverage for pothole resistance. I am afraid 3.4" sidewall will be too small for pothole safety. Since I bent 2 rims and cracked 1 rim stock this winter.

Patsfan123 · 03-23-2010, 11:04 PM

Any final thoughts before I set this up?

Patsfan123 · 03-24-2010, 11:10 PM

Going to go for the 245s as the I found several pics of them on the forum and the sidewall is very round like MassBimmer said. I'll think about spacers later on.. Can anyone around here do that for me?

Patsfan123 · 03-25-2010, 09:44 AM

Town Fair is giving me that BS that they won't mount the wheels because I didn't buy them through them... Can anyone local (Milford/Framingham) actually mount the wheels if I have Town Fair put the tires on the rims.

Actually I was going to reuse my TPMS.. UGH this sucks. What should I do. I also need an alignment

JeffL · 03-25-2010, 09:51 AM

wait you mean they won't put the wheels on the car? Really? I'd just do it myself but if you looking for someone Ron's Tire in Framingham will do it. Wheel Dynamix in Natick as well, this place will swap TPMS for you and mount the tires and do a PERFECT job without damage to your wheels. May cost a little extra but, Jeff the owner is a great guy and takes this stuff very seriously.

Patsfan123 · 03-25-2010, 09:57 AM

Quote:

Originally Posted by JeffL

wait you mean they won't put the wheels on the car? Really? I'd just do it myself but if you looking for someone Ron's Tire in Framingham will do it. Wheel Dynamix in Natick as well, this place will swap TPMS for you and mount the tires and do a PERFECT job without damage to your wheels. May cost a little extra but, Jeff the owner is a great guy and takes this stuff very seriously.

Basically I need to:
1 Buy the tires
2 Swap TPMS to new rims
3 mount and balance tires on rims
4 have wheels mounted onto vehicle
5 have the car aligned

Can Wheel Dynamix do all this?

JeffL · 03-25-2010, 10:39 AM

Quote:

Originally Posted by Patsfan123

Basically I need to:
1 Buy the tires
2 Swap TPMS to new rims
3 mount and balance tires on rims
4 have wheels mounted onto vehicle
5 have the car aligned

Can Wheel Dynamix do all this?

yes. They will not be the cheapest but they will do the best job and will guarantee absolutely NO damage to the wheels.

you might want to check tirerack for the tires though. Or give Wheel Dynamix a call and see what they can do.

Patsfan123 · 03-25-2010, 10:54 AM

Called them

8-10week backorder on 235/40 and 245/40. This is getting ridiculous

Tony Stark · 03-25-2010, 11:58 AM

I'm ordering tires from Discount Tire Direct. They have great prices on the Falkens I want.
If you've got a jack and 20min, you can put them on yourself.
I'd personally get a new set of TPMS so you don't have to dismount/remount tires just to swap TPMS every season.

JeffL · 03-25-2010, 12:01 PM

I'd start looking at different tires.

Patsfan123 · 03-26-2010, 12:53 PM

Quote:

Originally Posted by JeffL

I'd start looking at different tires.

Thinking about going with the Conti DW's which are summers.. Never owned a summer before. Since 235s will probably suck in the winter anyway, I guess this may work. Then worry about a winter setup in the fall..

JeffL · 03-26-2010, 02:28 PM

summer tires will not work at all in the winter regardless of size. I run a 255/45 on my M5 for the winter but they are full snow tires, Blizzak's. If you do go full summers you are going to need to swap them out in the winter.

MassBimmer · 03-26-2010, 03:29 PM

Quote:

Originally Posted by Patsfan123

Thinking about going with the Conti DW's which are summers.. Never owned a summer before. Since 235s will probably suck in the winter anyway, I guess this may work. Then worry about a winter setup in the fall..

Town Fair Tire told me the same thing so I ordered Conti DWS from tirerack, had them shipped to a local recommended shop and they installed for me. Conti DWS are perfectly capable in the winter, made it through many snow storms with them

Patsfan123 · 03-26-2010, 05:23 PM

JeffL, I would go with a summer and winter setup with that route. The runflats were slick enough in the winter, I wouldn't dare use summers. The DWS are nationally back ordered until June. So either I wait until June to get DWS, or I go all out with summers now, and buy a winter setup in the fall.

JeffL · 03-26-2010, 05:33 PM

I'd go all out summers on your new wheels and winters on your stockers. Snow tires and xi make the car unstoppable in the winter.

cb4 · 03-26-2010, 07:10 PM

Quote:

Originally Posted by MassBimmer

Town Fair Tire told me the same thing so I ordered Conti DWS from tirerack, had them shipped to a local recommended shop and they installed for me. Conti DWS are perfectly capable in the winter, made it through many snow storms with them

You are nuts.

03-22-2010, 11:27 PM	#1
Patsfan123 First Lieutenant 14 Rep 328 Posts Drives: 2007 328xi Coupe Join Date: Apr 2009 Location: Quincy, MA iTrader: (0)	235/40 or 245/40 on 18s My rims are arriving tomorrow and now I need to decide on a tire. I am definitely getting the Conti DWS but I need to decide whether to get 235/40 or 245/40. The rim size is 18x8.5 et 38. I don't want to worry about rubbing and don't plan on using any spacers. I also want to be pothole resistant.
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03-23-2010, 12:10 AM	#2
Arustik1 HYEPWR 100 Rep 2,868 Posts Drives: E46 M3 Join Date: Oct 2007 Location: Mesa, AZ iTrader: (3) Garage List 2007 E92 335i [0.00]	Go big or go home -D __________________ 2002 330ci Titanium Silver / Gray 2005 X5 3.0i Black Sapphire Metallic / Black 2002 M3 Laguna Seca Blue / Black 2001 M5 Jet Black / Black
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03-23-2010, 07:25 AM	#3
JeffL Major 35 Rep 1,202 Posts Drives: C63 Join Date: Jan 2008 Location: Massachusetts iTrader: (1)	235/40. The 245/40 is too tall, too much of a change over stock, JMHO though. Spacers in the back wouldn't hurt anything. __________________ no sig.
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03-23-2010, 08:02 AM	#4
Hedges Major General 116 Rep 5,178 Posts Drives: 12 C63 AMG Join Date: Jul 2008 Location: Toronto iTrader: (8)	Go big or go home
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03-23-2010, 08:24 AM	#5
MassBimmer Major General 307 Rep 7,433 Posts Drives: 2023 i4 M50 Join Date: May 2009 Location: MA iTrader: (6) Garage List 2009 BMW [9.24]	I have 235/40 Conti DWS on my 18x8.5...it's a very rounded sidewall so it runs on the smaller side...I still like the fitment though
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03-23-2010, 08:26 AM	#6
marcel b Lieutenant Colonel 132 Rep 1,898 Posts Drives: F31 340i Join Date: Jun 2009 Location: Europe iTrader: (0)	why not 245x35?
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03-23-2010, 12:40 PM	#7
Patsfan123 First Lieutenant 14 Rep 328 Posts Drives: 2007 328xi Coupe Join Date: Apr 2009 Location: Quincy, MA iTrader: (0)	Stock is 25.0" Diameter/4.0" Sidewall 235/40 25.4" Diameter/3.7" Sidewall 1.7% slower 245/40 25.7" Diameter/3.9" Sidewall 3.0% slower 245/35 24.8" Diameter/3.4" Sidewall 0.9% faster I wanted 245 for the extra grip and wanted 40 sidewall so I would have nearly the same amount of sidewall coverage for pothole resistance. I am afraid 3.4" sidewall will be too small for pothole safety. Since I bent 2 rims and cracked 1 rim stock this winter.
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03-23-2010, 11:04 PM	#8
Patsfan123 First Lieutenant 14 Rep 328 Posts Drives: 2007 328xi Coupe Join Date: Apr 2009 Location: Quincy, MA iTrader: (0)	Any final thoughts before I set this up?
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03-24-2010, 11:10 PM	#9
Patsfan123 First Lieutenant 14 Rep 328 Posts Drives: 2007 328xi Coupe Join Date: Apr 2009 Location: Quincy, MA iTrader: (0)	Going to go for the 245s as the I found several pics of them on the forum and the sidewall is very round like MassBimmer said. I'll think about spacers later on.. Can anyone around here do that for me?
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03-25-2010, 09:44 AM	#10
Patsfan123 First Lieutenant 14 Rep 328 Posts Drives: 2007 328xi Coupe Join Date: Apr 2009 Location: Quincy, MA iTrader: (0)	Town Fair is giving me that BS that they won't mount the wheels because I didn't buy them through them... Can anyone local (Milford/Framingham) actually mount the wheels if I have Town Fair put the tires on the rims. Actually I was going to reuse my TPMS.. UGH this sucks. What should I do. I also need an alignment
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03-25-2010, 09:51 AM	#11
JeffL Major 35 Rep 1,202 Posts Drives: C63 Join Date: Jan 2008 Location: Massachusetts iTrader: (1)	wait you mean they won't put the wheels on the car? Really? I'd just do it myself but if you looking for someone Ron's Tire in Framingham will do it. Wheel Dynamix in Natick as well, this place will swap TPMS for you and mount the tires and do a PERFECT job without damage to your wheels. May cost a little extra but, Jeff the owner is a great guy and takes this stuff very seriously. __________________ no sig.
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03-25-2010, 10:54 AM	#14
Patsfan123 First Lieutenant 14 Rep 328 Posts Drives: 2007 328xi Coupe Join Date: Apr 2009 Location: Quincy, MA iTrader: (0)	Called them 8-10week backorder on 235/40 and 245/40. This is getting ridiculous
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03-25-2010, 11:58 AM	#15
Tony Stark Banned 0 Rep 51 Posts Drives: 09 E90 Join Date: Mar 2010 Location: LFOD iTrader: (0)	I'm ordering tires from Discount Tire Direct. They have great prices on the Falkens I want. If you've got a jack and 20min, you can put them on yourself. I'd personally get a new set of TPMS so you don't have to dismount/remount tires just to swap TPMS every season.
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03-25-2010, 12:01 PM	#16
JeffL Major 35 Rep 1,202 Posts Drives: C63 Join Date: Jan 2008 Location: Massachusetts iTrader: (1)	I'd start looking at different tires. __________________ no sig.
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03-26-2010, 02:28 PM	#18
JeffL Major 35 Rep 1,202 Posts Drives: C63 Join Date: Jan 2008 Location: Massachusetts iTrader: (1)	summer tires will not work at all in the winter regardless of size. I run a 255/45 on my M5 for the winter but they are full snow tires, Blizzak's. If you do go full summers you are going to need to swap them out in the winter. __________________ no sig.
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03-26-2010, 05:23 PM	#20
Patsfan123 First Lieutenant 14 Rep 328 Posts Drives: 2007 328xi Coupe Join Date: Apr 2009 Location: Quincy, MA iTrader: (0)	JeffL, I would go with a summer and winter setup with that route. The runflats were slick enough in the winter, I wouldn't dare use summers. The DWS are nationally back ordered until June. So either I wait until June to get DWS, or I go all out with summers now, and buy a winter setup in the fall.
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03-26-2010, 05:33 PM	#21
JeffL Major 35 Rep 1,202 Posts Drives: C63 Join Date: Jan 2008 Location: Massachusetts iTrader: (1)	I'd go all out summers on your new wheels and winters on your stockers. Snow tires and xi make the car unstoppable in the winter. __________________ no sig.
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