[DCC]

Originally Posted by M2CS

I've looked at my roof multiple times and haven't found any defect in the pattern. Tomorrow I can try to capture a video of it from multiple angles to show what it really looks like.

I am glad to hear. Very glad.
Do share that video when you have time to capture it.
Enjoy the car

[M Fifty]

How doe BMW CF roofs cope with midwestern-sized hailstones?

[medphysdave]

Originally Posted by M Fifty

How doe BMW CF roofs cope with midwestern-sized hailstones?

It shouldn't dent.

[M Fifty]

Originally Posted by medphysdave

It shouldn't dent.

Will it delaminate though? Some of the pictures from this year suggested they were grapefruit sized.

[medphysdave]

Originally Posted by M Fifty

Will it delaminate though? Some of the pictures from this year suggested they were grapefruit sized.

Valid concern that is likely dependent upon the prep process and material. The carbon material would likely not flex much if any. That means that the clear portion needs to strong enough to not crack on impact. My belief is that it will be superior to a metal roof for damage resistance, but could delaminate if the prep was poor and the impact severe enough to cause the substrate (carbon roof) to flex away from clear.

I think it's unlikely, but not impossible.

[Jimjamz]

The more I watch videos of the checkerboard pattern on the CS roof the more it seems to me that many of the distortions reported on the roof are often misrepresented visual artefacts from off-centre video stills.

If you look at the video of the roof from Blue Purple Red below, you'll notice distortions on the left and right of the video centre point 'magically' disappear as the plane of the video comes into direct alignment to the lens only to reappear as the central video plane moves along. You can validate this yourself by pausing the video and noting a pristine squared alignment in the centre of the screen, then playing and pausing again a second later to note the same previously pristine square arrangement is now distorted when viewed at the edge of the video frame.

For actual owners out there, is this something you notice in person? I can only confirm in a few weeks on delivery, but it has bugged me that it seems to becoming accepted knowledge that such an otherwise obvious defect has slipped through production.

My suspicion is that some early manufacturing errors may well have occurred but that the rate of occurrence has been significantly amplified by misrepresented visual artefacts from off-centre video stills.

[gemini.m3]

The car I saw today was inside but I couldn’t see any roof imperfections with the naked eye.

[Acetech]

The issue is minor but probably present to some degree on most roofs. I've got two strands over 3 inches with minor buckling in the weave in the right front corner. Doesn't bother me, this particular roof weave is one of my favorite things about this car.

[sdhotwn]

There are minor defects in mine if you know what you are looking for. Other people couldn't spot it. To me it is character of the car.

[MadBimmeRad]

Originally Posted by sdhotwn

There are minor defects in mine if you know what you are looking for. Other people couldn't spot it. To me it is character of the car.

It's a Persian Flaw.

When Persians made their famous carpets starting millenia ago, they purposely would tie one of the tens of thousands of knots incorrectly.

This was their way of acknowledging nobody is perfect; and we know about how valuable Persian rugs happen to be.

M2CS's slight roof waviness is BMWs Persian Flaw!!

[Artemis]

Originally Posted by MadBimmeRad

It's a Persian Flaw.
when Persians made their famous carpets starting millenia ago, they purposely would tie one of the tens of thousands of knots incorrectly.
This was their way of acknowledging nobody is perfect; and we know about how valuable Persian rugs happen to be.
M2CS's slight roof waviness is BMWs Persian Flaw!!

See the insider info in the first post: this was definitely not supposed to happen, the fix came too late and BMW M feels embarrassed by it, especially as it happened with the top horse.

Let's see what roof the G87 M2 will get: metal, classic CFRP or F87 M2 CS CFRP.

[medphysdave]

I still think it's because they cut a square piece of carbon for a shape with a curved pattern.

[Artemis]

Originally Posted by medphysdave

I still think it's because they cut a square piece of carbon for a shape with a curved pattern.

The 'classic' CFRP roof also has curves (usually dubbed 'double bubble' CF roof). But a major difference is the fact that the M2 CS CFRP roof is a more structurally integrated part, with a sandwich-structured composite for improved rigidity, featuring a bigger sized weave pattern. The M2 CS roof does not feature roof drip rails with flaps featuring roof rack anchorage points.

'Classic' CFRP roof (F82 M4 Edition M Heritage):


M2 CS CFRP roof:


M2 Competition roof:



M2 Competition:


OG M2:


Alternative transport solution for the M2 CS: suction cups:

[CarJunkie]

Originally Posted by Artemis

Alternative transport solution for the M2 CS: suction cups:

If you spot my CS with a bike on top, you have permission to fire, sir.

[medphysdave]

Originally Posted by CarJunkie

If you spot my CS with a bike on top, you have permission to fire, sir.

I bet it's really stable. I wouldn't want the potentially marring of the surface, but at least there are options. I was watching a video this morning of a Porsche turbo convertible piled
High with furniture. A bike on a suction mounted rack would be tame in comparison.

[Artemis]

Originally Posted by CarJunkie

If you spot my CS with a bike on top, you have permission to fire, sir.

Brief off-topic: SeaSucker bike rack:

[medphysdave]

CS cf roof is made for it. Let's test the structural component claims.

[ND40oz]

Originally Posted by medphysdave

I bet it's really stable. I wouldn't want the potentially marring of the surface, but at least there are options. I was watching a video this morning of a Porsche turbo convertible piled
High with furniture. A bike on a suction mounted rack would be tame in comparison.

Who cares how stable it is though, driving the CS to a trailhead and then driving home with a mud covered bike and gear is doing it wrong.

[AxM2CS]

To each his/her own - better transporting your bike in the style and performance of the CS than, say a Yaris

These are interesting solutions. The first suction cup wouldn't work as shown, however - looks like the gurney would interfere. Also, wouldn't want the suction cup lifting the PPF.

[adc]

Originally Posted by ND40oz

Who cares how stable it is though, driving the CS to a trailhead and then driving home with a mud covered bike and gear is doing it wrong.

Au contraire. These cars are meant to do it all, if you aren’t then you’re doing it wrong.

If I stop driving my M3 in the winter, going to HD or grocery shopping, I might as well buy a Porsche or a Corvette.

[ND40oz]

Originally Posted by adc

Au contraire. These cars are meant to do it all, if you aren’t then you’re doing it wrong.

If I stop driving my M3 in the winter, going to HD or grocery shopping, I might as well buy a Porsche or a Corvette.

I'm not sure what driving in the winter, Home Depot or grocery shopping have to do with this but I can throw my bike into the back of my Mini and not give a crap about it. The M2 is a DD but I'm not going to take it down a fire road to get to some singletrack. If you're game to do that with your M3, more power to you.

[medphysdave]

Mine has a small defect in a few squares that isn't visible unless you know what to look for.
See how they do t look like squares, but more like arrowheads. This doesn't translate to a noticeable defect.