[NickNorth11]

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My plans for wheel size have changed and I'm leaning toward 20s. I want to stick with a squared setup. I think you've mentioned all of these sizes will fit (I'm assuming you're referring to non-fender flare cars). Can you verify these will all be flush? Also, for the tires, can you tell me what aspect ratio they are? I REALLY appreciate your help!

20 x 8.5 et 20 with 245s
20 x 8.5 et 25 with 245s
20 x 9.0 et 25 with 245s
If lowered: 20 x 9.0 et 20 with 255/35/20s
How much of a drop is needed to make these work?

 

[Technic]

My plans for wheel size have changed and I'm leaning toward 20s. I want to stick with a squared setup. I think you've mentioned all of these sizes will fit (I'm assuming you're referring to non-fender flare cars). Can you verify these will all be flush? Also, for the tires, can you tell me what aspect ratio they are? I REALLY appreciate your help!

20 x 8.5 et 20 with 245s
20 x 8.5 et 25 with 245s
20 x 9.0 et 25 with 245s
If lowered: 20 x 9.0 et 20 with 255/35/20s
How much of a drop is needed to make these work?

IMO, no rear fender flares:

• For range, flush with Eibach and low weight (custom, forged monoblock wheels): 20x8.5 et25 with 245/35-20 (XL 95 load = 690kg per tire) = less than 1% difference in diameter from OEM 19" tires. This is OEM+ fitment.
• For more traction, flush with Eibach, a bit less range, and a few pounds heavier : 20x9 et30 with 255/35-20 (XL 97 load = 730kg per tire) = 1.1% above diameter from OEM front, 0% difference in diameter from OEM rear 19" tire. This is aftermarket fitment.

Note: I have 20x9 et20 2-piece forged wheels because I do not care about range that much (anything over 200 miles is a radical improvement over my i3S), and I wanted as much concave-face wheels as possible with 9" wide wheels, and there is not that much concave to make with higher et than 20; going 9.5" wide wheels for deep concave would have added unnecessary weight and even less range. Eibach lowering springs will tuck the top of the tires in the front fenders, and the rear fender flares can accommodate up to 25mm of poke (et20 is 8mm poke over my 10" wide OEM rear wheel), so et20 square should poke less than running OEM springs.

 

[Techwhiz1]

Snip

20 x 8.5 et 20 with 245s
20 x 8.5 et 25 with 245s
20 x 9.0 et 25 with 245s
If lowered: 20 x 9.0 et 20 with 255/35/20s
How much of a drop is needed to make these work?

I'd go with the 20x9 wheels.
If you decided to go with a wider tire in the rear at some point you could.

On my 335i I had square wheels but 245/35-19 front and 275/30-19 rear on 9".

Waiting for my M50......

 

[NickNorth11]

Thanks guys! I decided on 20 x 9.0 et30. Hopefully I won't lose too much range, but I rarely drive that far, so I'm not too worried about it. Now the 2-3 month wait begins. 😕

 

[Tempbmw]

Got the M Performance foil and tint mounted today, really transformed the car i think.
Next up is mounting the M Performance Alcantara armrest, door sills and rear spoiler.

 

[Cable Guy]

Has someone found some wheels in 19" that fit on the i4 in the style of the BBS CI-R? I can only find 20", but for range reasons, I would like such or similar wheels in 19". But the damn load rating....... Any ideas?

 

[BenP]

Has someone found some wheels in 19" that fit on the i4 in the style of the BBS CI-R? I can only find 20", but for range reasons, I would like such or similar wheels in 19". But the damn load rating....... Any ideas?

My understanding and I might be wrong but the majority of the reason for the range loss is because of the width of the tires and the compound softness of the tires. The 20” rear tires width increases from 255 to 285 and the front go from 245 to 255. You could jump to a 20” wheel and keep the tires the same width as the 19” just reduce to a 35 ratio like the BMW 868 M Performance wheel set. I have read a lot about unsprung wheel weight and it’s effects on range. It seems to me from my reading and I am no expert but what ever extra energy is need to get the wheels spinning is mostly offset on the backend during regenerate braking.

 

[Technic]

Has someone found some wheels in 19" that fit on the i4 in the style of the BBS CI-R? I can only find 20", but for range reasons, I would like such or similar wheels in 19". But the damn load rating....... Any ideas?

The BBS CI-R is available in 19" and in i4 fitment - www.BBS.com

 

[Cable Guy]

The BBS CI-R is available in 19" and in i4 fitment - www.BBS.com

But when I search with the car (you can chose the eDrive40) only the 20" show up as compatible.

 

[Cable Guy]

My understanding and I might be wrong but the majority of the reason for the range loss is because of the width of the tires and the compound softness of the tires. The 20” rear tires width increases from 255 to 285 and the front go from 245 to 255. You could jump to a 20” wheel and keep the tires the same width as the 19” just reduce to a 35 ratio like the BMW 868 M Performance wheel set. I have read a lot about unsprung wheel weight and it’s effects on range. It seems to me from my reading and I am no expert but what ever extra energy is need to get the wheels spinning is mostly offset on the backend during regenerate braking.

Thanks. That's good to know. But it's not only range. IT's also the comfort that would be less. In combination with AC Schnitzer lowering springs, it could be a harsh ride.

 

[toosteeley]

Planning on going forged monoblock in OEM size (20x8.5 and 20x10) so I can use the stock tires (depending on what tires the car shows up with!) Assuming et25 front and et25 rear (with rear fender flares) to get a nice but not too aggressive flush fit. I figure that's +10mm front and +15mm rear over the stock wheels. Will be dropped with Eibach springs. Need to do more research, but that seems like a good place to start.

 

[ssh]

But when I search with the car (you can chose the eDrive40) only the 20" show up as compatible.

FWIW, my experience is that many sites which claim to allow fitment selection for the i4 clearly do not have clarity on what fits it. You'll likely get better help here.

 

[Cable Guy]

FWIW, my experience is that many sites which claim to allow fitment selection for the i4 clearly do not have clarity on what fits it. You'll likely get better help here.

I absolutely agree that I get the much better help in here. After what Technic said, I've researched more about the 19" CI-R and found that the load rating is at 719kg. But the i4 needs 750kg front and 800kg rear.....as much as I would love them, they won't work in 19". Or maybe I'm missing something.

 

[ssh]

@Technic, do you know more on this?

 

[Technic]

I absolutely agree that I get the much better help in here. After what Technic said, I've researched more about the 19" CI-R and found that the load rating is at 719kg. But the i4 needs 750kg front and 800kg rear.....as much as I would love them, they won't work in 19". Or maybe I'm missing something.

Somehow Tire Rack shows that their BBS CI-R in 19" do fit the i4 - but do not show their load rating: https://www.tirerack.com/wheels/WheelCloseUpServlet?target=runWheelSearch&autoMake=BMW&autoModel=i4+M50&autoYear=2023&autoModClar=&wheelMake=BBS&wheelModel=CI-R&wheelFinish=Platinum+Silver+w/Pol+SS+Lip&initialPartNumber=CI2101PSPO&selectedRear=CI2101PSPO

They will be able to accurately answer your questions.

An alternative to the BBS CI-R but in forged monoblock (CI-R are cast) is the BC Forged RZ-21 - you can select any finish, color, width, concavity and offset in 19" that you want, and the load rating start in the +800kgs:

 

[Bimmerscrub]

I know the thread has been quiet, but for those considering. Just arrived. Bcforge 19x9 Et 28 19x9.5 et 39. Coming from factory rim 19x8.5 front and 19x9 rear

weights at 23.6 and 23.8
Will be using the factory tires 245/40 19 and 255/40 19. According to the company. It will have the side wall relax and hang over the rim just a tad.

 

[topdawg37]

Thinking of getting these Lightspeed Racing wheels. They custom build them to your specs and come in a variety of materials. I confirmed that they would be able to handle the beefy weight of the M50.

20 inch (set of 4):
Carbon fiber 2 piece: $16000-$21000 starting at 14 lbs
Forged magnesium monoblock: $12500 starting at 15 lbs
Forged MAG + monoblock : $8000 starting at 17 lbs
Forged aluminum monoblock: $5000 starting at 22 lbs
Forged MAG+ 3 Piece: $9000 starting at 24 lbs
Forged aluminum 3 Piece: $7500 starting at 26 lbs
Brushed or polished color: +$800

 

[Bimmerscrub]

Definitely need lowering springs, but here’s post mounting.
7lbs difference per wheel

 

[pdu]

Not sure if this one is still active but did anyone consider the RIAL X12 wheels?

X12 - RIAL Leichtmetallfelgen

Bildergalerie X12 metal-grey Gewölbte Doppelspeichen treffen auf eine eigenständige Ästhetik für agilen Fahrspaß: X12. Kraftvoll elaboriert die Felge jedes Fahrzeug und ergänzt es mit seiner ganz eigenen Formsprache zu etwas völlig Neuem.

rial.de

Tov says that its for the i4 and it should have a max weight of 810kg

 

[Hybrid]

Not sure if this one is still active but did anyone consider the RIAL X12 wheels?

X12 - RIAL Leichtmetallfelgen

Bildergalerie X12 metal-grey Gewölbte Doppelspeichen treffen auf eine eigenständige Ästhetik für agilen Fahrspaß: X12. Kraftvoll elaboriert die Felge jedes Fahrzeug und ergänzt es mit seiner ganz eigenen Formsprache zu etwas völlig Neuem.

rial.de

Tov says that its for the i4 and it should have a max weight of 810kg

I did but I went with the similar but more "held together"-spoked GMP Italia Swan wheels. They are available in different appearances. You can check out how they look on the car earlier in this thread as I posted a picture of my car.