[hotlikelavadan]

I know this may sound odd or redundant but how can you tell a 18 inch rim will clear M Sport brakes? They clear the stock M Sport rims but when I tried to fit on an aftermarket rim they were hitting the caliper on the inner barrel. Is there a certain clearance it has to be or something? I could really use some help on this

[apexit]

Just another consideration when looking at wheels. You can try a more aggressive offset if it fits or adding spacers if the wheels don't come in a more aggressive offset.

[Mojave Spirit]

Is it a xdrive by any chance? On the 435xi if you pick m sport brakes it has to come with 19" wheels instead of 18s. Not sure if its the same on the F30

[hotlikelavadan]

Originally Posted by apexit

Just another consideration when looking at wheels. You can try a more aggressive offset if it fits or adding spacers if the wheels don't come in a more aggressive offset.

The offset was 35 all around and it was hitting the clips on the caliper. That was with spacers I think to avoid it in that particular case it would need a huge spacer wouldn't look right :/ I am talking about the clearance from the bottom of the caliper to the inner barrel

[hotlikelavadan]

Originally Posted by Mojave Spirit

Is it a xdrive by any chance? On the 435xi if you pick m sport brakes it has to come with 19" wheels instead of 18s. Not sure if its the same on the F30

Nah man 328i, I have the staggered 18 M Sport. Those clear fine but when I tried other 18s it did not clear the inner barrel the little silver clips were digging into it

[BXL4]

I have a similar concern and have newbie question. What does "more aggressive" offset mean numerically? If 35 is standard, and I want to be sure of cleaning the M-Sport brakes, do I need to look for something greater than 35 or less?

[.BMW.]

Lower offset will be more aggressive.

[hotlikelavadan]

Originally Posted by BXL4

I have a similar concern and have newbie question. What does "more aggressive" offset mean numerically? If 35 is standard, and I want to be sure of cleaning the M-Sport brakes, do I need to look for something greater than 35 or less?

You want lower if you are looking for aggressive. I ended up doing 35 clears the M Sport brakes 19x8.5 19x9.5 35 offset. It could still use a 5 mm spacer though

[Mattt1]

I found this post useful on the subject of brakes:

Original Brakes on 335dX, 335i, 335iX are:
Front rotor: 340x30mm (Millimeter) / Brake Caliper with 4 pistons
Rear rotor: 330x20mm / Brake Caliper with 1 piston

Original Brakes on all other models are:
Front rotor: 330x24mm (Millimeter) / Brake Caliper with 1 piston
Rear rotor: 300x20mm / Brake Caliper with 1 piston

Pricelist Option (Factory upgrade) with 2NH M Sport Brakes (blue colored) will bring that to:
Front rotor: 370mm (Millimeter) / Brake Caliper with 4 pistons (for 328i, 335i, 325d, 330d, 335dx) (18" Wheels needed with this rotor in Summer and Winter!!)
Front rotor: 340mm / Brake Caliper with 4 pistons (models below 328i/325d)
Rear rotor: 345mm / Brake Caliper with 2 pistons (on all models)
(So the 2NH option one can order from the factory is different. It is not the same for a "high power" or "low power" model!
High power models (328i, 335i, 325d, 330d, 335dx) get 370mm diameter rotor in the front. Others get 340mm rotor in the front. But the brake caliper will always be blue color)

For all the original brakes with 340mm rotors (335i, 335iX, 335dx) one can buy aftermarket original BMW replacement brake rotors in dimple drilled and slotted flavor.
Front rotor: 340mm = Part Number 34 10 6 797 602

For the factory upgrade with 2NH M Sport Brakes (blue colored) one can also buy aftermarket original BMW replacement brake rotors in dimple drilled and slotted flavor.
Front rotor: 370mm = Part Number 34 10 6 797 603 (18" Wheels needed with this rotor in Summer and Winter!!)
Or
Front rotor: 340mm = Part Number 34 10 6 797 602
(for those cars where the 2NH option just gives an upgrade to 340mm rotors. All below 328i, 325d))

Rear rotor: 345mm (all models) = Part Number 34 20 6 797 598


So and now what about the "M Performance Brakes"?
For a "high power" car owner (328i, 335i, 330d, 335dx):
Basically they are the same as if one would order the 2NH option and then aftermarket change to the rotors to the BMW replacement brake rotors in dimple drilled and slotted flavor.

For a "low power" car owner (models below 328i, 325d):
It's a much bigger upgrade. As they get 370mm front rotors instead of just a 340mm front rotors they would get by the 2NH Sport Brake Option for those models.

So if one is looking for dimple drilled and slotted front and rear rotors, and brake rotors with 370mm in front and 345mm in rear. M Performance Brakes is your choice.
They come in different caliper colors: Yellow, Orange, Red

M Performance Brakes need 18" Wheels in Summer and Winter

M Performance Power Kit (for 330d and 335dX only):
Needs a brake upgrade to S2NHA M Sport Brakes or 18" M Performance Brake!

Front rotor, weight comparision (per piece):
34 11 6 792 223 Standard rotor 340x30mm
10.2 Kilogramm / 22.2 Pounds (weighed my original rotor)

34 10 6 797 602 Slotted/drilled rotor 340x30mm
10.0 Kilogramm / 22 Pounds

34 10 6 797 606 Standard rotor 370x30mm (S2NHA Standard rotor for 335i)
16.50 Kilogramm / 36.4 Pounds (as listed in the parts catalog. probably a typo! Difference on size/volume compared to 340x30 is about 19%. So the calculated weight for the 370x30 is about 11.95 Kilogramm / 26.4 Pounds)

34 10 6 797 603 Slotted/drilled rotor 370x30mm (S2NHA Upgrade rotor or Standard 18" M Perfomance Brake rotor)
11.88 Kilogramm / 26.2 Pounds

[BXL4]

Apologies for my slowness on comprehension but if I want to fit over the M-Sport brakes with the winter wheels (18") then I should look for an offset of LESS than 37 and if I read the other comments in the thread, an offset of 32 wouldn't be bad. Correct?

Thanks to all who spend the time to help me get up to speed. I just HATE the thought of buying wheels at a good price that will never fit!

[metrickid]

Offset is not the only issue... The offset only makes sure that the spokes doesn't hit the caliper. You also need to find a 18" wheel that has a barrel that clears the caliper, that has nothing to do with the offset and is entirely up to wheel design.

And also remember that depending on the wheel width you have the offset is more or less aggressive. An 8.5 ET35 is more aggressive than a 8" ET35.

[BXL4]

Oh man, just when I thought I could spec and buy with confidence, this variable emerges. So, if I understand it, there is significant variability in the internal diameter of the barrel of aftermarket wheels?

[shivaswrath]

Originally Posted by hotlikelavadan

I know this may sound odd or redundant but how can you tell a 18 inch rim will clear M Sport brakes? They clear the stock M Sport rims but when I tried to fit on an aftermarket rim they were hitting the caliper on the inner barrel. Is there a certain clearance it has to be or something? I could really use some help on this

BMW 397
BMW 400M
have fit for me....

[hotlikelavadan]

Originally Posted by Rossifumi

Offset is not the only issue... The offset only makes sure that the spokes doesn't hit the caliper. You also need to find a 18" wheel that has a barrel that clears the caliper, that has nothing to do with the offset and is entirely up to wheel design.

And also remember that depending on the wheel width you have the offset is more or less aggressive. An 8.5 ET35 is more aggressive than a 8" ET35.

This what I was referring to, what the inner barrel clearance needs to be in order to clear the caliper. Mine was hitting on the metal clips on the end of the calipers. I just ended up going with 19s cleared fine.

[hotlikelavadan]

Originally Posted by BXL4

Oh man, just when I thought I could spec and buy with confidence, this variable emerges. So, if I understand it, there is significant variability in the internal diameter of the barrel of aftermarket wheels?

I just went with 19s and worked fine, seems easier to just go this route. Also the size seems to suit our car better.

[shivaswrath]

Originally Posted by hotlikelavadan

I just went with 19s and worked fine, seems easier to just go this route. Also the size seems to suit our car better.

Tracking with 19's is a little nutty though, which is probably why OP was wondering about 18's...don't want that rubber to roll over the rim!

[hotlikelavadan]

Originally Posted by shivaswrath

Tracking with 19's is a little nutty though, which is probably why OP was wondering about 18's...don't want that rubber to roll over the rim!

I am the OP, I have tracked my other car with 19s it just depends on the wheel, tire, suspension setup, etc.

[BXL4]

I have reached out to the newly minted "BMW Geniuses" to ask this questions and will post the response.

[hotlikelavadan]

Originally Posted by BXL4

I have reached out to the newly minted "BMW Geniuses" to ask this questions and will post the response.

Nice if you get an answer maybe you can send it to a mod it should be a sticky. I don't think most people think of brake clearance when putting rims on, just a thought.

[BXL4]

I just took delivery of my 2015 328i w/M-Sport brakes so I asked my delivery expert at Welt. He immediately agreed that not all 18" wheels will fit but that BMW can't keep track of which non-OEM wheels work and so on and as he kept talking, I finally realized that he was talking about tires not wheels. I had another appointment after delivery so I didn't bother to point out his misunderstanding.

Still waiting for the BMW USA Geniuses to get back on this.

[BXL4]

Originally Posted by BXL4

I just took delivery of my 2015 328i w/M-Sport brakes so I asked my delivery expert at Welt. He immediately agreed that not all 18" wheels will fit but that BMW can't keep track of which non-OEM wheels work and so on and as he kept talking, I finally realized that he was talking about tires not wheels. I had another appointment after delivery so I didn't bother to point out his misunderstanding.

Still waiting for the BMW USA Geniuses to get back on this.

I got an email from the Genius guys to say that they still don't have an answer about possible problems with wheel clearance for M-Sport brakes and 18" aftermarket wheels. I promise to post any final answers when I get them.

[simarddominic]

What I have in mind to go with 18" beside 19" is for our hard winter.

My 435i doing limit fine on bumpy road in confort mode with 19".

I think that the ride risk to be too rough with 19" on icy and snowy road...

I really want to know if, for exemple, a set of Avant Garde M310 Wheel 18x8 5x120 35mm will clear my M sport caliper before pulling the trigger...