Tirerack
Use the following links to go directly to useful tirerack winter items: Tirerack Winter Tires. Gary's Winter Tire FAQ.
Using the links directly supports E90Post with tirerack sales commision!

  E90Post
 


The Tire Rack

   PLEASE HELP SUPPORT E90POST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
 
BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Paranoid, would like confirmation.



Wheels and Tires forum Sponsored by The Tire Rack
Please help to directly support e90post by doing your tirerack shopping from the above link. For every sale made through the link, e90post gets sponsor support to keep the site alive. Disclaimer

Reply
 
Thread Tools Search this Thread
      02-13-2017, 12:59 PM   #1
mreto727
New Member
mreto727's Avatar
United_States
0
Rep
28
Posts

Drives: 2011 E90 335xi
Join Date: Dec 2016
Location: New Jersey

iTrader: (0)

Paranoid, would like confirmation.

Hello. I've had multiple wheel/tire posts lately I know... sorry about that. Not exactly my area of expertise. One would think I could wrap my head around rims and tires more easily when I understand the stuff under the hood. Anyway...

Bought snow tires, wrong size, got that fixed, but now I'm freaked about buying new rims.

I have 255/35 and 225/40 r18 tires for the summer. Will these fit on 9.5 and 8.5 respectively? I've googled and searched here and all I see is back and forth "yeah they're great no stretch" and "they work fine but they stretch." Those always talk about square setups though. The look from the stretch isn't really what concerns me. It's just the functionality. Will the front and rear stretch relatively close so that the staggered setup is still within the required minimal diameter difference? I'm having a hard time finding 8/8.5 setups that I fancy. In fact I barely see any at all in those sizes.

Also tirerack is confusing me with the offsets. Everywhere I look, and I've been told once on here already, 40mm+ offsets for 18x9.5 on the back. Then I hop over to tirerack and I see 18x9.5 et35 that supposedly fit my car. Can anyone clarify what to do for me?
Appreciate 0
      02-14-2017, 12:53 AM   #2
ApexRaceParts
BimmerPost Supporting Vendor
205
Rep
1,504
Posts


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

iTrader: (2)

Quote:
Originally Posted by mreto727 View Post
Hello. I've had multiple wheel/tire posts lately I know... sorry about that. Not exactly my area of expertise. One would think I could wrap my head around rims and tires more easily when I understand the stuff under the hood. Anyway...

Bought snow tires, wrong size, got that fixed, but now I'm freaked about buying new rims.

I have 255/35 and 225/40 r18 tires for the summer. Will these fit on 9.5 and 8.5 respectively? I've googled and searched here and all I see is back and forth "yeah they're great no stretch" and "they work fine but they stretch." Those always talk about square setups though. The look from the stretch isn't really what concerns me. It's just the functionality. Will the front and rear stretch relatively close so that the staggered setup is still within the required minimal diameter difference? I'm having a hard time finding 8/8.5 setups that I fancy. In fact I barely see any at all in those sizes.

Also tirerack is confusing me with the offsets. Everywhere I look, and I've been told once on here already, 40mm+ offsets for 18x9.5 on the back. Then I hop over to tirerack and I see 18x9.5 et35 that supposedly fit my car. Can anyone clarify what to do for me?
Happy to help. Your existing 225/40-18 & 255/35-18 summer tires will absolutely fit on a 18x8.5" front, 18x9.5" rear staggered fitment. Depending on the brand of tire (not all tires are created equal), the sidewall will be a touch stretched, but still very much acceptable for the wheel widths. Once those tires wear out, you can also bump up to 235/40-18 front, 265/35-18 rear assuming the wheel offsets are appropriate for the chassis. These slightly wider sizes will not only provide you with a touch more grip, but will also have a straight sidewall and will protect the wheel lips a bit better.

The overall height is within the acceptable range in both scenarios. See below:

Front: 225/40-18 - 25.09 in. tall
Rear: 235/40-18 - 25.03 in. tall

Front: 235/40-18 - 25.4 in. tall
Rear: 265/35-18 - 25.3 in. tall

In terms of wheel offset, there is an acceptable range that you can work with depending on how flush you want the wheels to be with the front and rear fenders, and with which tire size. Since you have an E90 LCI, you have less clearance in the rear then other E9X 3 series chassis.

If you are happy sticking with 255's in the rear, the you may use a lower offset like the 9.5" ET35. If you would like to be able to run 265's or 275's out back at some point, purchasing rear wheels with a slightly higher offset would be advantageous.

To give you a benchmark, here are our common staggered fitments for E90 LCI's. These all provide customers with bolt-on fitments with no modifications necessary:

Front: 18x8.5" ET35 - 225/40-18
Rear: 18x9.5" ET35 - 255/35-18

Front: 18x8.5" ET35 - 235/40-18
Rear: 18x9.5" ET43 - 265/35-18

Front: 18x9" ET31 - 235/40-18
Rear: 18x10" ET43 - 265/35-18

- Ryan
__________________
| Product Specialist | Phone: 925.245.0773 | Email: info@apexraceparts.com |

Website |Facebook | Instagram |Blog |

Last edited by ApexRaceParts; 02-14-2017 at 01:04 AM.
Appreciate 0
      02-14-2017, 03:38 PM   #3
mreto727
New Member
mreto727's Avatar
United_States
0
Rep
28
Posts

Drives: 2011 E90 335xi
Join Date: Dec 2016
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by ApexRaceParts View Post
Happy to help. Your existing 225/40-18 & 255/35-18 summer tires will absolutely fit on a 18x8.5" front, 18x9.5" rear staggered fitment. Depending on the brand of tire (not all tires are created equal), the sidewall will be a touch stretched, but still very much acceptable for the wheel widths. Once those tires wear out, you can also bump up to 235/40-18 front, 265/35-18 rear assuming the wheel offsets are appropriate for the chassis. These slightly wider sizes will not only provide you with a touch more grip, but will also have a straight sidewall and will protect the wheel lips a bit better.

The overall height is within the acceptable range in both scenarios. See below:

Front: 225/40-18 - 25.09 in. tall
Rear: 235/40-18 - 25.03 in. tall

Front: 235/40-18 - 25.4 in. tall
Rear: 265/35-18 - 25.3 in. tall

In terms of wheel offset, there is an acceptable range that you can work with depending on how flush you want the wheels to be with the front and rear fenders, and with which tire size. Since you have an E90 LCI, you have less clearance in the rear then other E9X 3 series chassis.

If you are happy sticking with 255's in the rear, the you may use a lower offset like the 9.5" ET35. If you would like to be able to run 265's or 275's out back at some point, purchasing rear wheels with a slightly higher offset would be advantageous.

To give you a benchmark, here are our common staggered fitments for E90 LCI's. These all provide customers with bolt-on fitments with no modifications necessary:

Front: 18x8.5" ET35 - 225/40-18
Rear: 18x9.5" ET35 - 255/35-18

Front: 18x8.5" ET35 - 235/40-18
Rear: 18x9.5" ET43 - 265/35-18

Front: 18x9" ET31 - 235/40-18
Rear: 18x10" ET43 - 265/35-18

- Ryan
Thank you for all of the info. If I were to buy et35 rears, would a simple 8mm spacer do the trick if I wanted to put 265/35s on in the future?
Appreciate 0
      02-15-2017, 01:13 AM   #4
ApexRaceParts
BimmerPost Supporting Vendor
205
Rep
1,504
Posts


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

iTrader: (2)

Quote:
Originally Posted by mreto727 View Post
Thank you for all of the info. If I were to buy et35 rears, would a simple 8mm spacer do the trick if I wanted to put 265/35s on in the future?
Quite the opposite. By adding 8mm spacers, it would change the 18x9.5" ET35 to an ET27. In other words, this would push the wheel 8mm further into the rear fenders, which only exacerbates the clearance problem.

Keep in mind, the lower the offset, the more aggressive the wheel fitment towards the outer fenders. The higher the offset, the more conservative the fitment (the wheel moves inboard).

Make sense?

- Ryan
__________________
| Product Specialist | Phone: 925.245.0773 | Email: info@apexraceparts.com |

Website |Facebook | Instagram |Blog |
Appreciate 0
      02-15-2017, 12:49 PM   #5
mreto727
New Member
mreto727's Avatar
United_States
0
Rep
28
Posts

Drives: 2011 E90 335xi
Join Date: Dec 2016
Location: New Jersey

iTrader: (0)

Quote:
Originally Posted by ApexRaceParts View Post
Quite the opposite. By adding 8mm spacers, it would change the 18x9.5" ET35 to an ET27. In other words, this would push the wheel 8mm further into the rear fenders, which only exacerbates the clearance problem.

Keep in mind, the lower the offset, the more aggressive the wheel fitment towards the outer fenders. The higher the offset, the more conservative the fitment (the wheel moves inboard).

Make sense?

- Ryan
Ohhhhh right. Forgot how the spacers work. There's no way to increase offset without changing the rims themselves then?
Appreciate 0
      02-15-2017, 05:14 PM   #6
ApexRaceParts
BimmerPost Supporting Vendor
205
Rep
1,504
Posts


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

iTrader: (2)

Quote:
Originally Posted by mreto727 View Post
Ohhhhh right. Forgot how the spacers work. There's no way to increase offset without changing the rims themselves then?
Correct, therefore running the higher ET43 offset would make sense if the idea is to run 265's at some point. In the mean time, with 255's installed you could run 5mm spacers with the ET43's to make them sit more flush.

- Ryan
__________________
| Product Specialist | Phone: 925.245.0773 | Email: info@apexraceparts.com |

Website |Facebook | Instagram |Blog |
Appreciate 0
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 -4. The time now is 05:07 PM.




e90post
e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2017, 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