Wheels and tires

[rxryanm.]

It's getting warm out, so 'tis the season to buy some wheels and tires. Unsure of what to go with and the widths/offsets I should seek. I'd maybe like some of the flow-formed HREs, but they have a bit of a hefty pricetag to go along with them.

So those of you who have aftermarket wheels, can you supply some pics and fitment specs? I've trolled through the stickied modded thread, but there weren't a ton of specs listed.

[TON-III]

I was leaning towards same issue, thought that would like to buy semi light alloys and found flow forming sets at sensible price tag ( both sets round a grand each). Summer ones (19x8,5 et 30/ 19x9,5 et et 37) not tried yet, winter ones (18 x 8 et 35) working perfectly .... or even better ( softened/narrowed tire too vs. former set) while being over 10 pounds lighter (each combination) suspension is also upgraded to an other level.

I'm eagering to experience how would summer set feel while the weight loose is to be even bigger.

My car is 'floating' high while still being in normal height (X-Drive with those high base springs), the outlook is getting better after my Eibach 20/25 mm set is installed.

[Greekstyle]

BC Forged HCS04. Fronts are 20x9 et+25. Rears are 20x10.5 et+40

[Alpine650]

I asked my SA to price some new Michelin Pilot Sports. He replied that BMW would not install non-run flats on my 650. If I replace the run flats with non run flats do I run the risk of losing Warranty coverage on items related to tires, i.e., suspension?

[doggboy]

Originally Posted by Alpine650

I asked my SA to price some new Michelin Pilot Sports. He replied that BMW would not install non-run flats on my 650. If I replace the run flats with non run flats do I run the risk of losing Warranty coverage on items related to tires, i.e., suspension?

Yeah, no. There is no way they can void any warranty claims over tires. You need to find a different shop, your dealer sounds less than helpful.

[arucano]

how long do you have left on your warranty. There is ZERO proof that non-runflats will adversely affect the performance or life of your suspension. That is a bunch of what the bull just dropped off. These cars have no suspension problems from what I know. If you are going to change, go to the MPS 4S. They are an improvement and are quieter than the MPS.

[BMPOWERED]

Rennen Forged 20x10 et37; 20x9 et29 - These wheels were much less expensive than you would typically spend on forged wheels

[TON-III]

Originally Posted by Alpine650

I asked my SA to price some new Michelin Pilot Sports. He replied that BMW would not install non-run flats on my 650. If I replace the run flats with non run flats do I run the risk of losing Warranty coverage on items related to tires, i.e., suspension?

In my opinion the suspension is up to brake WHEN you've the RF's under, those are so tough that all the bumps are hitting to your car body. With normal type of tires the tire absorbs part of bumbs.

[Alpine650]

Originally Posted by arucano

how long do you have left on your warranty. There is ZERO proof that non-runflats will adversely affect the performance or life of your suspension. That is a bunch of what the bull just dropped off. These cars have no suspension problems from what I know. If you are going to change, go to the MPS 4S. They are an improvement and are quieter than the MPS.

I have 18 months remaining on Warranty. The dealer did not state, nor did I ask, if the warranty would be voided on any repairs. Just my question.

[arucano]

The competition package comes with PSS from the factory. How can it be unacceptable to put them on your car.
I think he must be an alternative reason for his statement

[Alpine650]

Originally Posted by arucano

The competition package comes with PSS from the factory. How can it be unacceptable to put them on your car.
I think he must be an alternative reason for his statement

Does it come with a spare? There is a tire dealer in MA that wont put non run flats on a car that comes with run flats unless you sign your life away. While I believe BMW states the cars design includes run flats the tire dealer is concerned about the liability of someone getting a flat and being stranded with no spare.

[Alpine650]

I just read the competition package includes the M Mobility System - a can of fix a flat and a compressor. That's what I intend to do.

[TGG]

Originally Posted by Alpine650

Does it come with a spare? There is a tire dealer in MA that wont put non run flats on a car that comes with run flats unless you sign your life away. While I believe BMW states the cars design includes run flats the tire dealer is concerned about the liability of someone getting a flat and being stranded with no spare.

Really? I'm looking to convert to non RFs. Which dealer? Just do I can avoid that one. Thanks.

[Qsilver7]

Originally Posted by Alpine650

I just read the competition package includes the M Mobility System - a can of fix a flat and a compressor. That's what I intend to do.

If you're going to be shopping online for the BMW mobility system...I recommend getting the newer designed kit where the sealant container is inside the case that holds the compressor. It's a little bit easier to operate with just a further turn of the switch to activate sending sealant through the tube along with air. You don't have to hook up the separate sealant canister when sealant is required. Plus if you do use all of the sealant (or it expires) BMW sells the replacement sealant module (#2 in the diagram below):

[Alpine650]

Originally Posted by TGG

Really? I'm looking to convert to non RFs. Which dealer? Just do I can avoid that one. Thanks.

Peabody. Sullivan Tire has or had the same policy.

[brad850csi]

F10 M5 343m or 601m. Cheap and the 343m are very light too.

[mjd41985]

I hope this helps...
2013 650ix lowered on H&R Springs.
21"ADV.105 +26 offset
21x9.5 (FRONT) 245/30/21 Michelin Pilot Super Sport
21x10.5 (Rear) 295/25/21 Michelin Pilot Super Sport

[jjasonSU]

Vossen VFS2


Front
22x9 +30
245/30 PZero

Rear
22x10.5 +38
285/25 PZero

[elvisisdog]

JjasonSU - I'm loving the stance of your coupe. Any fitment issues, rubbing etc. Are you still on stock springs?

[mjd41985]

Originally Posted by RxRyanM

It's getting warm out, so 'tis the season to buy some wheels and tires. Unsure of what to go with and the widths/offsets I should seek. I'd maybe like some of the flow-formed HREs, but they have a bit of a hefty pricetag to go along with them.

So those of you who have aftermarket wheels, can you supply some pics and fitment specs? I've trolled through the stickied modded thread, but there weren't a ton of specs listed.

Hey, I noticed you have an X-Drive (as do I) this makes things a little more complicated when buying wheels. I'm no mechanic, but it's my understanding you have to keep an eye on "rotational mass" of the tires (I think!) They all have to be within a certain % of each other. I believe it's called "rotational mass" Regardless, there are calculators online to figure it out. I just wanted to give you a heads up, if you didn't already know about this. If the tires aren't the correct sizes, you'll have issues with your transfer case. If I'm wrong, someone please correct me. I just wanted to give you the heads up.

[itzjoker]

Originally Posted by mjd41985

Hey, I noticed you have an X-Drive (as do I) this makes things a little more complicated when buying wheels. I'm no mechanic, but it's my understanding you have to keep an eye on "rotational mass" of the tires (I think!) They all have to be within a certain % of each other. I believe it's called "rotational mass" Regardless, there are calculators online to figure it out. I just wanted to give you a heads up, if you didn't already know about this. If the tires aren't the correct sizes, you'll have issues with your transfer case. If I'm wrong, someone please correct me. I just wanted to give you the heads up.

I believe for AWD cars you have to be within a certain tolerance for the circumference between the front and rear wheels. For my Audi it was under 2% difference in circumference, not sure about BMW but I can't imagine it being much different. You're right there are calculators all over the internet.

You want the front and rear wheels to be spinning at the same RPM for AWD otherwise you risk burning through the differential, correct me if I'm wrong on that statement.

Rotational mass comes into play with the weight of the wheels which can 'free up' some horsepower when you go lighter. You won't be gaining BHP, but transferring more power efficiently to the wheels so you'll see an increase in your WHP. Think of lightweight flywheels and driveshafts etc, takes less energy to spin.

Going back to wheels, imo 21" are the perfect size. You see majority of M6s go with that size. 20" is nice, but more conservative. 22" you could be sacrificing a lot of ride quality.

[ezmaass]

Originally Posted by Alpine650

I asked my SA to price some new Michelin Pilot Sports. He replied that BMW would not install non-run flats on my 650. If I replace the run flats with non run flats do I run the risk of losing Warranty coverage on items related to tires, i.e., suspension?

My dealer had initially pushed back, as well. It was the service receptionist who refused to even discuss it. I was quite annoyed. I e-mailed my sales guy and asked why I paid them $113k for a car only to be refused a simple service like changing the tires to my choice. Needless to say, he "fixed" the problem for me. But it DID require signing FOUR copies of a document stating that I was knowingly changing away from run flat tires and that the car wouldn't drive on flats any longer. Seriously.

When I did this (last summer), the car was 2.5 years old - so still under warranty. There was no discussion or threat that changing to non runflat would void anything with the warranty. I don't believe that argument would hold up very well if challenged. You could argue that a Bugatti's tires, meant to withstand incredible speed (beyond a traditional tire) would void a warranty if changed, but you'd be hard pressed to convince anyone that a like-for-like spec (size, speed rating, load rating, etc) on a "normal" car like a BMW would call for voiding anything.