[somer]

Originally Posted by Chicane_

I'm a little skeptical that aftermarket aluminum wheels could shave off that much weight while still being as strong.

20" R101:
Front: 18.2lbs
Rear: 18.8lbs

21" FI-R
Front: 20.8lbs
Rear: 22.1lbs

Hopefully somebody does Satin Bronze HRE R101's on a Frozen Green CS, would be winner winner chicken dinner!

[Chicane_]

Originally Posted by somer

20" R101:
Front: 18.2lbs
Rear: 18.8lbs

21" FI-R
Front: 20.8lbs
Rear: 22.1lbs

Hopefully somebody does Satin Bronze HRE R101's on a Frozen Green CS, would be winner winner chicken dinner!

There are unquestionably lighter wheel options but I'm wondering if those are as strong. OEM wheels are engineered to extreme safety standards.

[CFoote]

Originally Posted by josec70

Same … been sitting over 3 weeks at this point for RAM at Port of Baltimore.

Unfortunately you are probably waiting on a harmon kardon amp or a camera. They have no desire to hold the car, it's been a tough year all around with new cars.

Chris

[josec70]

Originally Posted by CFoote

Unfortunately you are probably waiting on a harmon kardon amp or a camera. They have no desire to hold the car, it's been a tough year all around with new cars.

Chris

Car's spec'd with B&W .. waiting on a chip for that apparently.

[WickedBMW]

Originally Posted by josec70

Car's spec'd with B&W .. waiting on a chip for that apparently.

CS with B&W?

[josec70]

Originally Posted by WickedBMW

CS with B&W?

Individual M5C ….

[RAUDERRIPPER]

Originally Posted by Chicane_

There are unquestionably lighter wheel options but I'm wondering if those are as strong. OEM wheels are engineered to extreme safety standards.

Do you know the wheel load rating for the OEM f90 wheels?

Attached is an email from BC forged about the wheels I inquired about for the CS.

Dinan aftermarket wheels have a load rating of 1560.
https://www.dinancars.com/products/w.../D750-0093-BRU

[Chicane_]

Originally Posted by RAUDERRIPPER

Do you know the wheel load rating for the OEM f90 wheels?

Attached is an email from BC forged about the wheels I inquired about for the CS.

Dinan aftermarket wheels have a load rating of 1560.
https://www.dinancars.com/products/w.../D750-0093-BRU

No, I can't say that I know them but they were specifically designed for the 4,000 pound CS so I'd be surprised if BMW/Fuchs left that much extra mass on the table to be saved by the aftermarket. Especially since they were quite focused on weight reduction.

I'm no expert in this area - just questioning if we are really comparing apples to apples before jumping to the conclusion that the stock CS wheels were not substantially optimized for the application. Wheel design calculations and stress analysis presumably considers much more than just vertical loading (ie. lateral bending, torque carrying ability etc). It might also consider the tire sidewall stiffness and coefficient of friction. The science is way over my head.

[Bluehorseshoe]

Interesting to learn about load. Perhaps someone can identify it on M5 CS wheel. Here are all the markings.

[somer]

3mins of very speculative research but..

https://www.ebay.com/itm/313632329852

Load Index:
102 & 104

then referencing this chart: https://www.wheelworks.net/tires/tir...er/load-index/

102(front presumable) 1874lbs
104(rear presumable) 1984lbs

Would line up with the BC forged email above.

[shawnhayes]

Originally Posted by Chicane_

No, I can't say that I know them but they were specifically designed for the 4,000 pound CS so I'd be surprised if BMW/Fuchs left that much extra mass on the table to be saved by the aftermarket. Especially since they were quite focused on weight reduction.

I'm no expert in this area - just questioning if we are really comparing apples to apples before jumping to the conclusion that the stock CS wheels were not substantially optimized for the application. Wheel design calculations and stress analysis presumably considers much more than just vertical loading (ie. lateral bending, torque carrying ability etc). It might also consider the tire sidewall stiffness and coefficient of friction. The science is way over my head.

OEM "limits of testing" is very very different than aftermarket. Very, very few cars will see the edge of loads tested by OEM manufacturers. Aftermarket wheels can often get some "grace" from their users when a wheel bends or breaks under severe load conditions. OEM's don't get that grace. Ever. ONE wheel breaks at a pothole, ONE, and some whiny thread shows up with threats of a "class action lawsuit".

It's just how it works.

Shawn

[CFoote]

Originally Posted by shawnhayes

OEM "limits of testing" is very very different than aftermarket. Very, very few cars will see the edge of loads tested by OEM manufacturers. Aftermarket wheels can often get some "grace" from their users when a wheel bends or breaks under severe load conditions. OEM's don't get that grace. Ever. ONE wheel breaks at a pothole, ONE, and some whiny thread shows up with threats of a "class action lawsuit".

It's just how it works.

Shawn

^^^ This... not saying BMW hasn't had their fair share of OEM supplier issues with wheels over the years, but OEM testing is pretty stringent.

Chris

[RAUDERRIPPER]

Originally Posted by Chicane_

No, I can't say that I know them but they were specifically designed for the 4,000 pound CS so I'd be surprised if BMW/Fuchs left that much extra mass on the table to be saved by the aftermarket. Especially since they were quite focused on weight reduction.

I'm no expert in this area - just questioning if we are really comparing apples to apples before jumping to the conclusion that the stock CS wheels were not substantially optimized for the application. Wheel design calculations and stress analysis presumably considers much more than just vertical loading (ie. lateral bending, torque carrying ability etc). It might also consider the tire sidewall stiffness and coefficient of friction. The science is way over my head.

With the multitude of people who put BBS,HRE, etc. and other aftermarket wheels, I think you'll be okay. Unless you can provide proof that every member here who did modify their vehicle with aftermarket wheels had structural failure, I'm not really worried about a catastrophic event due to their wheel choice.
Otherwise, we'd prob see a shitload of threads with totaled cars due to their wheels crushing at 150mph runs left and right.

"A wheel's maximum load rating is determined by checking the back of your wheel. To find your wheel load rating requirements, divide your vehicles heaviest gross axle weight rating by 2."

For this f90 m5 (door plaque attached) the requirements would translate to the wheels needing a strength of at least 1340 lbs and 1390 lbs respectively. I read from a Porsche thread a member asked BBS if the 20in fi-r worked on a taycan, BBS said no, the 21in version would work, however. So when in doubt, just ask the manufacturer.

[RAUDERRIPPER]

Originally Posted by Bluehorseshoe

Interesting to learn about load. Perhaps someone can identify it on M5 CS wheel. Here are all the markings.

https://www.ozracing.com/world-of-oz...el/672-marking

Maybe this comes into play?

[Chicane_]

Originally Posted by shawnhayes

OEM "limits of testing" is very very different than aftermarket. Very, very few cars will see the edge of loads tested by OEM manufacturers. Aftermarket wheels can often get some "grace" from their users when a wheel bends or breaks under severe load conditions. OEM's don't get that grace. Ever. ONE wheel breaks at a pothole, ONE, and some whiny thread shows up with threats of a "class action lawsuit".

It's just how it works.

Shawn

That's what I thought. The factory wheels are monstrously strong relative to their aftermarket counterparts.

[mermar]

I contacted my local (high volume) dealers and they said they don't have "any CS's left". Sounds like any allocation they had have been sold. Shoot - I missed the window... was thinking that orders were still open.
So I will be looking for a nice pre-owned CS in the future... Unless the 'buzz' wears off and I find something else.

My only concern about CS would be the lack of rear folding seats - sometimes I stuff my road bike with the front wheel off in the back (sounds crazy but it is a good way to transport an expensive carbon bike - especially as we usually stop somewhere after the ride/race for a beverage. safe and secure inside. But we have 2 others SUV's in the family that will be called into duty as needed. Motor Trend seemed to suggest the new M5 Comp is the better value. But Sutcliff in the EVO review gushes that the CS is worlds better then the Comp.

[phoenixbmwlife]

Originally Posted by mermar

I contacted my local (high volume) dealers and they said they don't have "any CS's left". Sounds like any allocation they had have been sold. Shoot - I missed the window... was thinking that orders were still open.
So I will be looking for a nice pre-owned CS in the future... Unless the 'buzz' wears off and I find something else.

My only concern about CS would be the lack of rear folding seats - sometimes I stuff my road bike with the front wheel off in the back (sounds crazy but it is a good way to transport an expensive carbon bike - especially as we usually stop somewhere after the ride/race for a beverage. safe and secure inside. But we have 2 others SUV's in the family that will be called into duty as needed. Motor Trend seemed to suggest the new M5 Comp is the better value. But Sutcliff in the EVO review gushes that the CS is worlds better then the Comp.

You always have the choice of the roof rack. You can attach the bike there and put one of the wheels in the trunk.

[phoenixbmwlife]

Originally Posted by mermar

I contacted my local (high volume) dealers and they said they don't have "any CS's left". Sounds like any allocation they had have been sold. Shoot - I missed the window... was thinking that orders were still open.
So I will be looking for a nice pre-owned CS in the future... Unless the 'buzz' wears off and I find something else.

My only concern about CS would be the lack of rear folding seats - sometimes I stuff my road bike with the front wheel off in the back (sounds crazy but it is a good way to transport an expensive carbon bike - especially as we usually stop somewhere after the ride/race for a beverage. safe and secure inside. But we have 2 others SUV's in the family that will be called into duty as needed. Motor Trend seemed to suggest the new M5 Comp is the better value. But Sutcliff in the EVO review gushes that the CS is worlds better then the Comp.

Btw I'm curious. I'd love to see the carbon bike.

[Day Laborer]

Originally Posted by mermar

I contacted my local (high volume) dealers and they said they don't have "any CS's left". Sounds like any allocation they had have been sold. Shoot - I missed the window... was thinking that orders were still open.
So I will be looking for a nice pre-owned CS in the future... Unless the 'buzz' wears off and I find something else.

My only concern about CS would be the lack of rear folding seats - sometimes I stuff my road bike with the front wheel off in the back (sounds crazy but it is a good way to transport an expensive carbon bike - especially as we usually stop somewhere after the ride/race for a beverage. safe and secure inside. But we have 2 others SUV's in the family that will be called into duty as needed. Motor Trend seemed to suggest the new M5 Comp is the better value. But Sutcliff in the EVO review gushes that the CS is worlds better then the Comp.

WICKEDBMW has his used one for sale in the Classified section.

Or you can reference the list I continually update here:

https://f90.bimmerpost.com/forums/sh...20&postcount=8

[mermar]

Originally Posted by phoenixbmwlife

Btw I'm curious. I'd love to see the carbon bike.

Hey Phoenix - I forgot that even with the carbon roof - BMW is now including the OEM roof rack mounts. I'm old enough now that I don't have time for garage queens - my next M car will be driven... maybe even with a roof rack!
I have all sorts of bikes...too many really. I coach (high school team) and race off road XC mountain bike, but also ride road and gravel.
My current fave road bike is my Specialized SL7... the aero features really do make a significant difference. All that is to say, I'm skinny enough that I am looking forward to the carbon sport seats
Wish I was in Phonix now! Snow and freezing hear in the north - so all my training is indoors...

[mermar]

Originally Posted by Day Laborer

WICKEDBMW has his used one for sale in the Classified section.

Or you can reference the list I continually update here:

https://f90.bimmerpost.com/forums/sh...20&postcount=8

Thanks! Looks like CS's are all selling over MSRP...I'll wait a year or so if need be. Just not in my DNA to pay Market Adjust to dealer. Crazy times - I get it. I see why Tesla is direct to consumer...

[phoenixbmwlife]

Originally Posted by mermar

Hey Phoenix - I forgot that even with the carbon roof - BMW is now including the OEM roof rack mounts. I'm old enough now that I don't have time for garage queens - my next M car will be driven... maybe even with a roof rack!
I have all sorts of bikes...too many really. I coach (high school team) and race off road XC mountain bike, but also ride road and gravel.
My current fave road bike is my Specialized SL7... the aero features really do make a significant difference. All that is to say, I'm skinny enough that I am looking forward to the carbon sport seats
Wish I was in Phonix now! Snow and freezing hear in the north - so all my training is indoors...

Yeah no garage queen for this car. You can def drive this one daily and attach the roof rack.

In my opinion if you're someone that has a family, and need back seats it's the ultimate drivers car. Keep looking…I hope you find one. Wish you luck!

-Phoenix