BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > Planning to lower F20 to reduce body roll && tyre size
Post Reply
 
Thread Tools Search this Thread
      08-26-2018, 02:16 PM   #1
ncore00
New Member
United Kingdom
3
Rep
15
Posts

Drives: 1 Series hatch
Join Date: Aug 2015
Location: UK

iTrader: (0)

Planning to lower F20 to reduce body roll && tyre size

Hi,

I bought a set of H&R lowering springs about 35mm drop, I want to lower the car due to body roll when cornering as I take twisty road with some potholes to work and I can feel the car leaning. But curious how well it will sit with 16" wheels Will the tyre rub on the arch due to chunkiness of the tyre and being lowered?

Has anyone tried lowering their bimmer with stock 16"s? mind posting some pics even if it was an old pics.

Also, what's the correct tyre size on 18s for F20s? Planning to get mv2s as well from E46, but just want to know the correct tyre size.

Thanks
Appreciate 0
      08-26-2018, 06:15 PM   #2
lt.Gruber
New Member
2
Rep
27
Posts

Drives: f20 118i
Join Date: Jun 2018
Location: Norway

iTrader: (0)

You should be fine with 225/40/18.
Do you want to use springs or go for coilovers?
Appreciate 0
      08-26-2018, 10:11 PM   #3
ovekvam
Brigadier General
Norway
203
Rep
3,149
Posts

Drives: F20 LCI 118i M-Sport B38
Join Date: Jun 2012
Location: Bryne, Norway

iTrader: (0)

Lowering the car will not really reduce body roll, but stiffer springs and damper (which lowering kits ofter are) will. The tyres will not rub the arches.
Appreciate 0
      08-27-2018, 07:08 AM   #4
ncore00
New Member
United Kingdom
3
Rep
15
Posts

Drives: 1 Series hatch
Join Date: Aug 2015
Location: UK

iTrader: (0)

Quote:
Originally Posted by lt.Gruber View Post
You should be fine with 225/40/18.
Do you want to use springs or go for coilovers?
springs, I see can I use 225/45/18 in the front? Some people said the same "225/40/18" for fronts and "255/35/18" for the rears.
Appreciate 0
      08-27-2018, 10:48 AM   #5
ovekvam
Brigadier General
Norway
203
Rep
3,149
Posts

Drives: F20 LCI 118i M-Sport B38
Join Date: Jun 2012
Location: Bryne, Norway

iTrader: (0)

If you go with stiffer springs to reduce body roll, you should either change to stiffer dampers, or run with adjustable dampers always in sport mode. Otherwise the car will be more bouncy, and be worse handling wise than stock.

I guess 225/45-18 would be possible, but it is not a good fit for the car. If the car is xDrive, it will definitely not work. 225/40-18 is the correct size.
Appreciate 0
      11-02-2018, 03:56 AM   #6
ashiohsiao
New Member
ashiohsiao's Avatar
Taiwan
0
Rep
21
Posts

Drives: 2012 F20 118i
Join Date: Oct 2018
Location: Taiwan

iTrader: (0)

From my own personal past experience and experience of my friends, simply using lowering springs (with stock dampers) are usually a pretty bad idea... not only the damping force of the stock dampers would not match with the lowering springs, the geometry might be off (less optimized), and you might also be riding on the bump stops if the drop is too much...

You may be interested in checking out his vid:
Appreciate 0
      11-10-2018, 11:07 AM   #7
Estoril Blue 116d
Private
Estoril Blue 116d's Avatar
Norway
4
Rep
57
Posts

Drives: The blur Marvel
Join Date: Sep 2018
Location: Norway

iTrader: (0)

As others stated, to reduce body roll you cannot rely on springs only. Here's my 2 cent...

Sports shocks and especially stiffer Anti Roll Bars will help a lot. Stiffer bushings will tidy up everything even more.

As for wheels you should be fine with stock 16"s... I believe you can lower as much as you'd like without anything rubbing.

I have the M-Sport suspension and there's body roll. I like it. It makes the car lean down and hug the road when accelerating "hard" out of corners. It's the only times I notice the body roll. Other than that the 116d feels planted (for a normal car).

I have 18"s with 225/40/18 upfront and 245/45/18 for the rear. It came that way from the factory. The summer tires are gone and thank god for that because they're RFT and I've never experienced something so bad. Totally ruins the behaviour and tramlines as mad. Completely bonkers to drive.

Regarding fitment I could easily space out the rear wheels 0.8-1.0 at the rear and 0.5 at the front without rubbing... Maybe I'll try, at least at the rear.
Appreciate 0
      11-10-2018, 12:24 PM   #8
No one
Captain
270
Rep
814
Posts

Drives: F21 118i
Join Date: Oct 2014
Location: Undisclosed

iTrader: (0)

Quote:
Originally Posted by Estoril Blue 116d View Post
I have 18"s with 225/40/18 upfront and 245/45/18 for the rear. It came that way from the factory.
It's 245/35/18 at the rear. You have to admit that. An easy tip if you really miss it: the wider the lower to maintain the same effective diameter of the wheel.
Appreciate 0
      11-10-2018, 12:41 PM   #9
Estoril Blue 116d
Private
Estoril Blue 116d's Avatar
Norway
4
Rep
57
Posts

Drives: The blur Marvel
Join Date: Sep 2018
Location: Norway

iTrader: (0)

Quote:
Originally Posted by No one View Post
It's 245/35/18 at the rear. You have to admit that. An easy tip if you really miss it: the wider the lower to maintain the same effective diameter of the wheel.
Yes, you're right. Was a typo..
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



All times are GMT -5. The time now is 06:47 PM.




1addicts
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
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