Whats with the curve on the top tube on some carbon bikes ?

[Cuchilo]

Is it to add strength to the carbon lay up via deflection on the frame or am I totally wrong ?
Im a bit nerdy when it comes to construction so I need to know these things

 

[MikeG]

I suspect it's just because they can. And it helps differentiate carbon frames from more traditional ones.

 

[Cuchilo]

If it was because they can they would be doing crazy shoot like they do with seat stays ?
I think its a construction thing .

 

[sight-pin]

I would think it's for strength in the design, If it was straight and you fell off the seat hard onto the top tube, it would be able to support more weight being curved rather than straight. OR!! i could be talking total rubbish as i don't really have a clue.

Edited

 

[Shut Up Legs]

A bit of Googling, and I found this, which makes sense (I think, I'm no expert):
http://www.bikeforums.net/road-cycl...opposed-sloping-top-tubes-2.html#post14716396

 

[slowmotion]

I have an aluminium bike with a curved top tube...a Specialized Secteur Elite. I dimly remember reading that it was supposed to bend more easily to absorb vibrations or something. Almost certainly a whole heap of marketing b****cks.