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BMW M5 F90 (2018+) General Forums Wheels | Tires | Suspension | Brakes | Chassis    BBS FI-R interest thread...poll

View Poll Results: which size would you opt for.
20 inch fitment (OEM) 53 51.96%
21 inch fitment 49 48.04%
Voters: 102. You may not vote on this poll

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      12-04-2018, 10:27 AM   #1
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BBS FI-R interest thread...poll

Hello All

this is an interest thread merely for the purpose of seeing how many f90 M5 owners would like to own a set of the iconic FI-R wheels

i gave 2 options 20inch oem fitment or 21inch fitment.

If we gather enough interest BBS "may" look at doing this fitment.

I have enclosed some pics for reference. thanks IND

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      12-04-2018, 11:44 AM   #2
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Best wheels out there - would like to see an option for 20" front and 21" rear too.
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      12-05-2018, 09:30 AM   #3
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keep them coming guys....i will be emailing my contact at BBS if we have enough interest.
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      12-05-2018, 12:27 PM   #4
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Quote:
Originally Posted by brad850csi View Post
Best wheels out there - would like to see an option for 20" front and 21" rear too.
Are you saying front 20" and rear 21"????

You can't do that on this car!!!
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      12-05-2018, 12:43 PM   #5
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Quote:
Originally Posted by Miko M View Post
Are you saying front 20" and rear 21"????

You can't do that on this car!!!
Sure you can. BMW allow you to do square tyres as well as one of the options being 265/40r19 with 285/40r19.

So from identical circumference front and rear up to 2.3% bigger at the rear.

Running 275/35r20 and 295/30r21 is only 1.4% different and 275/35r20 and 305/30r21 is 2.2% different
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      12-05-2018, 01:15 PM   #6
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Quote:
Originally Posted by brad850csi View Post
Quote:
Originally Posted by Miko M View Post
Are you saying front 20" and rear 21"????

You can't do that on this car!!!
Sure you can. BMW allow you to do square tyres as well as one of the options being 265/40r19 with 285/40r19.

So from identical circumference front and rear up to 2.3% bigger at the rear.

Running 275/35r20 and 295/30r21 is only 1.4% different and 275/35r20 and 305/30r21 is 2.2% different
265 front and 285 back is 2.6%. NOT 2.3%

Didn't know we have that size, all I know is 275 front and 285 back which is 1.1 %

Bmw recommendation is 1.3% or less
Obviously less is better.
Rim width doesn't effect the rolling diameter much but, you can't stretch the tire to much.

This is old article from BMW :

"The tire circumference can fluctuate up to 1% or more as a result of mixed tires or wear. The tire tolerance logic decides depending on the driver's command and driving situation whether the slip is to occur in the transfer case clutch or at the contact area between tire and road.

If the slip is permitted in the transfer case clutch, the locking pressure set by the pre-con- trol is reduced in order to keep the work loss low. In the driving dynamic control situation, the clutch is locked slightly more than normal, the four wheel drive is always guaranteed when required.

For maximum xDrive performance, tires (and wheels) of the same diameter should be installed on the vehicle."
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      12-05-2018, 01:22 PM   #7
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Quote:
Originally Posted by Miko M View Post
265 front and 285 back is 2.6%. NOT 2.3%

Didn't know we have that size, all I know is 275 front and 285 back which is 1.1 %

Bmw recommendation is 1.3% or less
Obviously less is better.
Rim width doesn't effect the rolling diameter much but, you can't stretch the tire to much.

This is old article from BMW :

"The tire circumference can fluctuate up to 1% or more as a result of mixed tires or wear. The tire tolerance logic decides depending on the driver's command and driving situation whether the slip is to occur in the transfer case clutch or at the contact area between tire and road.

If the slip is permitted in the transfer case clutch, the locking pressure set by the pre-con- trol is reduced in order to keep the work loss low. In the driving dynamic control situation, the clutch is locked slightly more than normal, the four wheel drive is always guaranteed when required.

For maximum xDrive performance, tires (and wheels) of the same diameter should be installed on the vehicle."
Here is where the 265 and 285 combo is documented:

https://www.realoem.com/bmw/enUS/sho...diagId=36_2297

I was doing 27.98" / 27.35" = 1.023035 for the 265 and 285 option

Then for my 21" concept, 28.21" / 27.58" = 1.022843
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      12-05-2018, 02:02 PM   #8
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Quote:
Originally Posted by brad850csi View Post
Quote:
Originally Posted by Miko M View Post
265 front and 285 back is 2.6%. NOT 2.3%

Didn't know we have that size, all I know is 275 front and 285 back which is 1.1 %

Bmw recommendation is 1.3% or less
Obviously less is better.
Rim width doesn't effect the rolling diameter much but, you can't stretch the tire to much.

This is old article from BMW :

"The tire circumference can fluctuate up to 1% or more as a result of mixed tires or wear. The tire tolerance logic decides depending on the driver's command and driving situation whether the slip is to occur in the transfer case clutch or at the contact area between tire and road.

If the slip is permitted in the transfer case clutch, the locking pressure set by the pre-con- trol is reduced in order to keep the work loss low. In the driving dynamic control situation, the clutch is locked slightly more than normal, the four wheel drive is always guaranteed when required.

For maximum xDrive performance, tires (and wheels) of the same diameter should be installed on the vehicle."
Here is where the 265 and 285 combo is documented:

https://www.realoem.com/bmw/enUS/sho...diagId=36_2297

I was doing 27.98" / 27.35" = 1.023035 for the 265 and 285 option

Then for my 21" concept, 28.21" / 27.58" = 1.022843
Looking at the website on mine phone it looks like 265 or 285 not 265/285 unless I am seeing things different. Need to go on computer and look at the website.

Your first option would be acceptable, second one IMO not so much.

Any AWD manufacturers ( like Subaru ) don't recommend to go over 1% they are pioneers in AWD

I personally like to stay below 1.3% to be safe
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      12-05-2018, 07:57 PM   #9
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Interesting that there are more 21" wheels selected via the poll.
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      12-06-2018, 12:58 PM   #10
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21's do suit the car, but 20's with the right tire and drop will be fine.

i opt for 20's due to lower height and road conditions etc.
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      12-10-2018, 01:37 PM   #11
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Bump
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      12-11-2018, 11:25 AM   #12
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Im down for a set in 20
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      12-11-2018, 03:40 PM   #13
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They better hurry - come april i need some new shoes
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      12-13-2018, 10:41 AM   #14
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My GOD that M4 looks good. I'm interested...
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      12-13-2018, 11:37 AM   #15
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keep the responses coming boys.

the more interested garnered the more likely BBS is to build these wheels.
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      12-14-2018, 11:40 PM   #16
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F90 needs 21s. Just got a comp and the 20s honestly look small for the wheel well
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      12-17-2018, 11:33 AM   #17
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waiting to hear back.

sit tight....
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      12-17-2018, 09:10 PM   #18
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Quote:
Originally Posted by Spoolin Montego View Post
F90 needs 21s. Just got a comp and the 20s honestly look small for the wheel well
^^^this^^^^
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      12-18-2018, 10:04 AM   #19
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Quote:
Originally Posted by Spoolin Montego View Post
F90 needs 21s. Just got a comp and the 20s honestly look small for the wheel well
i guess it also depends on the drop. have a look at this car sitting on 20 inch BBS LM's from another member. i think it looks perfect!

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      12-18-2018, 01:11 PM   #20
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Quote:
Originally Posted by Ragazzi-07 View Post
i guess it also depends on the drop. have a look at this car sitting on 20 inch BBS LM's from another member. i think it looks perfect!

Attachment 1956677
The drop will be unaffected whether you go 20" or 21" as the overall width of the wheels/ tires will be very similar; it's really dependent on the suspension set-up.

Aesthetically speaking, I like the look of a larger wheel better, in this case 21". This is 100% subjective and based solely on my preferences.
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      12-20-2018, 07:49 PM   #21
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Interested in 20's
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      12-20-2018, 11:22 PM   #22
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Good news boys.

Top brass mentioned to me this is marked "heavy consideration" at the next meeting in the new year!

We're moving in the right direction.

Considering it was a "no" before.

I've sent a copy of this thread to them as well.

Keep the votes rolling in 😬
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