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Carbon Vs Metal


Pickled

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Ok, another one of those who prefers what questions.

 

 

 

In terms of MTB XC bikes, rather take carbon frame or alu frame?? Which is the better option in terms of durability, chances of breaking etc???

 

 

 

I am looking at a bikes, costs are similar, so that is not a factor, simply the material of the frame.

 

 

 

What say the wise... (ok then the people) of the hub???

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If you want plain out durability go for aluminium it will be far more resilient. That said it is not indestructable. Have you ever seen a alu bike after its done the Imana, not a pretty sight.

The pro's of carbon are basically its weight and slightly more forgiving ride. That's it.
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If you don't mind having to fork some $$$ out on the odd occasion you manage to break your carbon frame they rock.  Otherwise stick to an alu, you can at least keep on riding it if it dings.

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Having seen more than a few carbon survive where alu bikes ahve failed, I am inclined to believe that carbon frames are tough and stiff.

 

Also they seem to be able to take quite a lot of punishment..
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The past weekend I had a look at the new GT carbon frames. There is a new model that has the same team frame but lower specced with LX groupset. You do get an alu version of the bike with the same parts. The carbon costs R6500 more and weighs 300g more. So I thing performance should be amazing to compensate for what you are losing in your wallet and gaining in weight.

 

 
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if you can afford carbon then why not go for Ti -  I know of plenty of people who've had there Ti mountain bike 10 years and still rave about it......

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if you can afford carbon then why not go for Ti -  I know of plenty of people who've had there Ti mountain bike 10 years and still rave about it......

 

exactly, if you're gonna be a ponce, do it properly.

 

 
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It is a myth that an alu frame is stronger than a carbon frame.  As everything in life, the answer is not straight forward.  A frame is only as strong as its weakest point, which on an alu frame is where it is welded.  Same for ti frame, with the added complexity that ti welding is very specialised and baically consists of heat fusion.  Theoretically carbon should be stronger in the areas where an alu bike is welded, but it also depends on how the carbon is composed and overlayed.  Carbon fibre is a composite material, so recipes differ.  Carbon has superior strength in one direction, that is why they use different overlay directions on frames.  Carbon does, however, not have great impact strength, i.e. when something sharp hits it hard.  As it is a composite, with a molecular structure which consists of a hard and soft matrix, it would generally not result in a catastrophic failure - that is why you see it cracking not in a straight line.

 

The bottom line is that I think a well constructed carbon frame with good overlays and a good composite structure, will always be stronger than an alu or ti frame (as the weld will always be weaker).  In a fall, carbon may pick up impact damage easier, but it should not have any risks of fatigue cracks as you see on welds in alu frames.
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Ok, so, the bike options

 

Trek Ex 9

 

Specialized Epic Comp

 

BH Trail Racer D45K

 

Trek Top Fuel 9.8 (2007)

 

 

 

These are my choices at the moment...

 

What would people take???

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I'd go Trek. Made massive strides in the last 3 years with there mountain bikes. Top quality gear (I had a 2005 9.8 hardtail) and a great ride

 

The specialized has just had a total redesign, so you may find a deal that way, but plenty of people have had mixed experiences with the brain shock on the old design... The new Epic has something more like the FSR suspension set up

 

no idea about the BH but I'm sure someone here will have owned / ridden one and can give views on.....

 

PPWTF2008-07-23 04:05:21

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Is Cromoly dead?

 

I thought that steel was real. Apparently not any more.

 

Kona Explosif, Orange P7, Wanga Voodoo, Salsa Ala Carte, Redline Monocog, Jamis Dragon.....not too many more name brands as far as I know.
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