BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

Post Reply
 
Thread Tools Search this Thread
      11-06-2012, 01:18 PM   #1
robertm
Captain
11
Rep
877
Posts

 
Drives: BSM 1M
Join Date: Oct 2007
Location: dfw

iTrader: (0)

Square setup - how wide can you go

So I've pretty well decided I'm switching to a square setup. 18x10 25et all around. I'm doing this for a myriad of reasons. First I love the way the car handles with this setup. Second, the ability to rotate all tires to all corners will greatly increase tire life. Third, 18s are cheaper than 19s.

The question though is how wide can we go up front. A few people are already running 275/35/18s with stock susp (don't know if they are using camber plates -anyone?). I've got 295s on the back now and I'd like to stay as wide as possible. So, can we get 285s up front and what's it going to take?

Here's some background info:

STOCK:
Front: 245/35/19 Sect Width 9.8" Dia 25.8"
Back: 265/3519 Sect Width 10.7" Dia 26.3"

18" Options:
275/35/18 Sect Width 10.9" Dia 25.6"
285/30/18 Sect Width 11.4'" Dia 24.8"
285/35/18 Sect Width 11.4" Dia 25.9"

One thing to note is the front stock size section width is misleading as it’s based on a 8.5" wheel and we are running 9" wheel. So maybe change that section width to 10.3".

Looking at the difference between the 285/30 and 285/35 the thing that stands out is the overall dia. The 285/35 would be a much nicer looking fit as the dia more closely matches stock. I'm afraid 285/30 may create a pretty large wheel gap with the fender.

It doesn't end there though. Here are a couple other data points:

285/30/18 Tread Width 10.5"
285/35/18 Tread Width 10.1"

So the 285/30 is shorter (dia) but it has a seemingly larger contact patch. This would be good where rubber meets the road but what effect will that have inside the wheel well?

Basically compared to each other:
285/30 short and wide
285/35 tall and narrow

So what will it take to make one of these work? Camber plates seem like a given. Will spacers be required too? One requirement is they still need to fit within the fender or at least not make contact with the outer fender under track loading conditions.


Thoughts, ideas, opinions!

Last edited by robertm; 11-06-2012 at 01:46 PM.
Appreciate 0
      11-06-2012, 01:57 PM   #2
MDORPHN
Colonel
41
Rep
2,550
Posts

 
Drives: AW 1M
Join Date: Oct 2010
Location: Wash, DC

iTrader: (0)

Don't believe you'll be able to fit a 285 in front. 265 is as large as you can go with no rubbing. The extent of the rubbing with 275s -- the largest I think you can go -- will depend on ride height and camber.

Neil
Appreciate 0
      11-06-2012, 01:59 PM   #3
EINSER M
Major General
EINSER M's Avatar
United_States
92
Rep
5,368
Posts

 
Drives: 2011 E82 1M
Join Date: May 2006
Location: 34.1064 N, 117.5922 W, 300m altitude

iTrader: (38)

Garage List
Send a message via AIM to EINSER M Send a message via MSN to EINSER M Send a message via Yahoo to EINSER M
i have a square set up now that I had for SEMA
no rubbing
5mm spacers rear

SSR type F
19x9.5 +28 20.4lbs front
19x10.0 +20 20.8lbs rear

Nitto NT05
275/30R19 front
275/30R19 rear

__________________
THE EINSER M BUILD
CLICK HERE: EINSER M BUILD

Appreciate 0
      11-06-2012, 02:31 PM   #4
ApexRaceParts
BimmerPost Supporting Dealership
35
Rep
835
Posts


 
Drives: M3
Join Date: Jun 2012
Location: Bay Area

iTrader: (1)

Quote:
Originally Posted by robertm View Post
So I've pretty well decided I'm switching to a square setup. 18x10 25et all around. I'm doing this for a myriad of reasons. First I love the way the car handles with this setup. Second, the ability to rotate all tires to all corners will greatly increase tire life. Third, 18s are cheaper than 19s.

The question though is how wide can we go up front. A few people are already running 275/35/18s with stock susp (don't know if they are using camber plates -anyone?). I've got 295s on the back now and I'd like to stay as wide as possible. So, can we get 285s up front and what's it going to take?

Here's some background info:

STOCK:
Front: 245/35/19 Sect Width 9.8" Dia 25.8"
Back: 265/3519 Sect Width 10.7" Dia 26.3"

18" Options:
275/35/18 Sect Width 10.9" Dia 25.6"
285/30/18 Sect Width 11.4'" Dia 24.8"
285/35/18 Sect Width 11.4" Dia 25.9"

One thing to note is the front stock size section width is misleading as its based on a 8.5" wheel and we are running 9" wheel. So maybe change that section width to 10.3".

Looking at the difference between the 285/30 and 285/35 the thing that stands out is the overall dia. The 285/35 would be a much nicer looking fit as the dia more closely matches stock. I'm afraid 285/30 may create a pretty large wheel gap with the fender.

It doesn't end there though. Here are a couple other data points:

285/30/18 Tread Width 10.5"
285/35/18 Tread Width 10.1"

So the 285/30 is shorter (dia) but it has a seemingly larger contact patch. This would be good where rubber meets the road but what effect will that have inside the wheel well?

Basically compared to each other:
285/30 short and wide
285/35 tall and narrow

So what will it take to make one of these work? Camber plates seem like a given. Will spacers be required too? One requirement is they still need to fit within the fender or at least not make contact with the outer fender under track loading conditions.


Thoughts, ideas, opinions!
With Camber plates you can definitely fit a 285/30/18 front tire and 18x10" ET25 in the front of your 1M. Strut clearance will be very close but you should be able to clear on an oem set up and coilover set up as long as attention is paid to the spring perch location relative to the wheel/tire. This is the maximum width for the front of your 1M. The 285/35/18 is way too tall and even with an extreme amount of negative camber it will definitely rub on the fender liners with any kind of steering angle. Also the 285/35/18 would look quite odd with that tall of a tire in the front of the car. We have 18x10" ET25 wheels available in both the ARC-8 and EC-7 models as well as camber plates for your 1M!
__________________
| Product Specialist | Phone: 925.245.0773 | Email: info@apexraceparts.com |

Website |Facebook | Instagram |Blog |
Appreciate 0
      11-08-2012, 05:49 PM   #5
M3 Adjuster
Brigadier General
41
Rep
3,587
Posts

 
Drives: 1988 M3 gone .. 1M HERE!!
Join Date: Mar 2008
Location: Dallas, Tx

iTrader: (0)

Quote:
Originally Posted by Joe@ApexRaceParts View Post
With Camber plates you can definitely fit a 285/30/18 front tire and 18x10" ET25 in the front of your 1M. Strut clearance will be very close but you should be able to clear on an oem set up and coilover set up as long as attention is paid to the spring perch location relative to the wheel/tire. This is the maximum width for the front of your 1M. The 285/35/18 is way too tall and even with an extreme amount of negative camber it will definitely rub on the fender liners with any kind of steering angle. Also the 285/35/18 would look quite odd with that tall of a tire in the front of the car. We have 18x10" ET25 wheels available in both the ARC-8 and EC-7 models as well as camber plates for your 1M!
thanks for the informative post.. I concur.. particularly regarding the 35 sidewall

I was able to fit a 285/30 Hoosier.. on a BONE STOCK CAR .. before camber plates.. see here.

http://www.1addicts.com/forums/showthread.php?t=602568

it was VERY close and rubbed ever so slightly but in retrospect.. I think it would work if one is not concerned about minor rubbing... I know that I was definitely a lot more conservative back then as I did not want any fender liner damage. With camber plates.. I am sure these would work.. Might even be able to borrow that setup again from a friend to confirm....
__________________
Lone Star BMW CCA Chapter president, Chief Driving Instructor

Last edited by M3 Adjuster; 11-08-2012 at 06:08 PM.
Appreciate 0
      11-14-2012, 12:54 PM   #6
robertm
Captain
11
Rep
877
Posts

 
Drives: BSM 1M
Join Date: Oct 2007
Location: dfw

iTrader: (0)

Quote:
Originally Posted by Joe@ApexRaceParts View Post
With Camber plates you can definitely fit a 285/30/18 front tire and 18x10" ET25 in the front of your 1M. Strut clearance will be very close but you should be able to clear on an oem set up and coilover set up as long as attention is paid to the spring perch location relative to the wheel/tire. This is the maximum width for the front of your 1M. The 285/35/18 is way too tall and even with an extreme amount of negative camber it will definitely rub on the fender liners with any kind of steering angle. Also the 285/35/18 would look quite odd with that tall of a tire in the front of the car. We have 18x10" ET25 wheels available in both the ARC-8 and EC-7 models as well as camber plates for your 1M!
Quote:
Originally Posted by M3 Adjuster View Post
thanks for the informative post.. I concur.. particularly regarding the 35 sidewall

I was able to fit a 285/30 Hoosier.. on a BONE STOCK CAR .. before camber plates.. see here.

http://www.1addicts.com/forums/showthread.php?t=602568

it was VERY close and rubbed ever so slightly but in retrospect.. I think it would work if one is not concerned about minor rubbing... I know that I was definitely a lot more conservative back then as I did not want any fender liner damage. With camber plates.. I am sure these would work.. Might even be able to borrow that setup again from a friend to confirm....

Thanks very much for the info! Sorry it's taken so long to reply. I have been crazy busy at work as of late.

Jeff the Ec-7s are what I plan on getting. Will do Vorshlag camber plates too.

Looking at what tire options are available may make the decision for me. In the 275/35/18 I can get Michelan PSS. Those are pretty much unequivocally the best street tires out there. In the 285/30/18 the best I can find it are Potenza S-04s. I don't think these are as good a tire as the PSSs.

So, I'm thinking for now I'll probably just do 275/35/18 all around. I won't have to do camber plates immediately either which is nice as tires and wheels are going to be expensive.

Once I burn through this set maybe PSS will come in the 285/30/18 size.

Thanks!
Appreciate 0
      11-14-2012, 01:13 PM   #7
ApexRaceParts
BimmerPost Supporting Dealership
35
Rep
835
Posts


 
Drives: M3
Join Date: Jun 2012
Location: Bay Area

iTrader: (1)

Quote:
Originally Posted by robertm View Post
Thanks very much for the info! Sorry it's taken so long to reply. I have been crazy busy at work as of late.

Jeff the Ec-7s are what I plan on getting. Will do Vorshlag camber plates too.

Looking at what tire options are available may make the decision for me. In the 275/35/18 I can get Michelan PSS. Those are pretty much unequivocally the best street tires out there. In the 285/30/18 the best I can find it are Potenza S-04s. I don't think these are as good a tire as the PSSs.

So, I'm thinking for now I'll probably just do 275/35/18 all around. I won't have to do camber plates immediately either which is nice as tires and wheels are going to be expensive.

Once I burn through this set maybe PSS will come in the 285/30/18 size.

Thanks!
Robert,

There are a few other better options out there for people looking for a 285/30/18 tire. That size is also available in the Yokohama AD08 extreme performance tire and will be available in the new Dunlop Star Spec Direzza ZII that will be coming out at the end of winter or early spring depending on when Tire Rack receives them. These tires will offer better ultimate dry grip. Wet grip and street civility will be slightly down but these are still great performing tires and the new Dunlop Star Spec may really surprise us all.
__________________
| Product Specialist | Phone: 925.245.0773 | Email: info@apexraceparts.com |

Website |Facebook | Instagram |Blog |
Appreciate 0
      11-18-2012, 07:40 AM   #8
robertm
Captain
11
Rep
877
Posts

 
Drives: BSM 1M
Join Date: Oct 2007
Location: dfw

iTrader: (0)

Quote:
Originally Posted by Joe@ApexRaceParts View Post
Robert,

There are a few other better options out there for people looking for a 285/30/18 tire. That size is also available in the Yokohama AD08 extreme performance tire and will be available in the new Dunlop Star Spec Direzza ZII that will be coming out at the end of winter or early spring depending on when Tire Rack receives them. These tires will offer better ultimate dry grip. Wet grip and street civility will be slightly down but these are still great performing tires and the new Dunlop Star Spec may really surprise us all.
Thanks for the info on the other tires. I don't care about wet performance so no worries there. How long do those two tires last though? Think they have equiv lifespan as PSSs?

One other thing I was thinking about. Running 285/30/18s with camber plates to get them to fit. Am I going to need extreme camber to make them work? I mean running 2.5-3 deg negative camber on the street will wear out the insides pretty quick.

Also, next Friday is Black Friday. Biggest sale day of the year. Just saying Apex
Appreciate 0
      11-18-2012, 09:20 AM   #9
splitsecond
Space Admiral
splitsecond's Avatar
United_States
4
Rep
335
Posts

 
Drives: 135i
Join Date: Sep 2012
Location: St. Louis

iTrader: (1)

Garage List
2008 BMW 135i  [0.00]
Sorry to threadjack, but I have a similar question for the gurus - would it be possible to run a 275 in the rear with the BMW Performance suspension without any rubbing? The previous owner of my car managed to run a 265, but I was wondering how wide I can go in the back with the lowered suspension.
__________________
2008 135i Montego Blue sport pkg, premium pkg, Logic 7 sound, iDrive/Nav
Mods completed: JB4+ & FBO || LSD || BMW-P suspension + F/R sway bars || 18" Breyton GTS-R || M3 front bushings || Vogtland camber plates || BMW-P rotors + Stoptech pads |||| Acquired, not installed: BMS WW Meth kit || Logic HVI intake || Mishimoto OCC |||| Shopping for: Summer tires
Appreciate 0
      11-18-2012, 05:36 PM   #10
///BYU
Second Lieutenant
///BYU's Avatar
United_States
7
Rep
299
Posts

 
Drives: AW 1M
Join Date: Aug 2011
Location: United States

iTrader: (1)

Quote:
Originally Posted by robertm View Post
Also, next Friday is Black Friday. Biggest sale day of the year. Just saying Apex :D
This. Been waiting forever to pick up a square set of ARC-8s. :)

The last ARC-8 group buy I saw closed 2/2/2012. I missed it and my life has been nothing but sad trombones ever since.

http://www.1addicts.com/forums/showthread.php?t=633986
Appreciate 0
      11-18-2012, 10:19 PM   #11
MDORPHN
Colonel
41
Rep
2,550
Posts

 
Drives: AW 1M
Join Date: Oct 2010
Location: Wash, DC

iTrader: (0)

Quote:
Originally Posted by splitsecond View Post
Sorry to threadjack, but I have a similar question for the gurus - would it be possible to run a 275 in the rear with the BMW Performance suspension without any rubbing? The previous owner of my car managed to run a 265, but I was wondering how wide I can go in the back with the lowered suspension.
Yes, no problem. Even on lowered car, you can run 285 or 295s.

Neil
Appreciate 0
      11-19-2012, 12:26 AM   #12
splitsecond
Space Admiral
splitsecond's Avatar
United_States
4
Rep
335
Posts

 
Drives: 135i
Join Date: Sep 2012
Location: St. Louis

iTrader: (1)

Garage List
2008 BMW 135i  [0.00]
Quote:
Originally Posted by MDORPHN View Post
Yes, no problem. Even on lowered car, you can run 285 or 295s.

Neil
Cool, thanks. If that's the case, then why doesn't everybody run 275s instead of 265s?
__________________
2008 135i Montego Blue sport pkg, premium pkg, Logic 7 sound, iDrive/Nav
Mods completed: JB4+ & FBO || LSD || BMW-P suspension + F/R sway bars || 18" Breyton GTS-R || M3 front bushings || Vogtland camber plates || BMW-P rotors + Stoptech pads |||| Acquired, not installed: BMS WW Meth kit || Logic HVI intake || Mishimoto OCC |||| Shopping for: Summer tires
Appreciate 0
      11-19-2012, 02:03 AM   #13
bdaddylo
Major
bdaddylo's Avatar
United_States
17
Rep
1,134
Posts

 
Drives: 2011 E90 M3 ZCP
Join Date: Dec 2010
Location: Houston, TX

iTrader: (2)

Garage List
Quote:
Originally Posted by splitsecond View Post
Cool, thanks. If that's the case, then why doesn't everybody run 275s instead of 265s?
I believe Neil was commenting on what will fit the 1M and not the 135. Most of the track junkies are using at least 275s on the rear.
__________________
_______________________
2011 E90 M3 ZCP/AW/Ohlins R&T
Appreciate 0
      11-19-2012, 08:45 AM   #14
robertm
Captain
11
Rep
877
Posts

 
Drives: BSM 1M
Join Date: Oct 2007
Location: dfw

iTrader: (0)

How about we stop posting on this thread what will and will not fit a 135. No disrespect, but please respect the fact this thread was created soley for a square setup on a 1M. Much appreciated.

No need to reply to this post. Just start a new thread for 135 related question.
Appreciate 0
      11-19-2012, 09:10 AM   #15
MDORPHN
Colonel
41
Rep
2,550
Posts

 
Drives: AW 1M
Join Date: Oct 2010
Location: Wash, DC

iTrader: (0)

Quote:
Originally Posted by bdaddylo View Post
I believe Neil was commenting on what will fit the 1M and not the 135. Most of the track junkies are using at least 275s on the rear.
Quite right. I failed to note that the poster to whom I was replying had a 135.

Sorry 'bout that.

Neil
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 08:08 PM.




1addicts
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST