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New Carbon Fiber Information



 
 
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  #1  
Old January 10th 17, 02:48 PM posted to rec.bicycles.tech
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Default New Carbon Fiber Information

A friend who speaks Italian spoke with a bike builder in Italy who spoke to Ernesto Colnago. He verified that the problem with Carbon Fiber aside from possible manufacturing defects is that the resins grow more and more brittle with age. After two years or so they can grow so brittle that the ultra-lights can fail at any second. This is why Colnago will only give two year warranties and why they build their "light" bikes considerably heavier than other manufacturers.

Have a good ride on your CF when you can get the same weight with an aluminum frame.
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  #2  
Old January 10th 17, 07:33 PM posted to rec.bicycles.tech
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Default New Carbon Fiber Information

On Tuesday, January 10, 2017 at 3:48:20 PM UTC+1, wrote:
A friend who speaks Italian spoke with a bike builder in Italy who spoke to Ernesto Colnago. He verified that the problem with Carbon Fiber aside from possible manufacturing defects is that the resins grow more and more brittle with age. After two years or so they can grow so brittle that the ultra-lights can fail at any second. This is why Colnago will only give two year warranties and why they build their "light" bikes considerably heavier than other manufacturers.

Have a good ride on your CF when you can get the same weight with an aluminum frame.


Colnago doesn't have the know how to build light CF bikes that last and/or stiff enough so the answer of Ernesto doesn't surprise me.
Something like Kodak that didn't know anything about digital camera's.

Show me an aluminum frame of 850 grams. Any frame lighter than 1300 gram I prefer the CF one. YMMV.

Lou
  #3  
Old January 10th 17, 08:56 PM posted to rec.bicycles.tech
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Default New Carbon Fiber Information

On Tuesday, January 10, 2017 at 11:33:43 AM UTC-8, wrote:
On Tuesday, January 10, 2017 at 3:48:20 PM UTC+1, wrote:
A friend who speaks Italian spoke with a bike builder in Italy who spoke to Ernesto Colnago. He verified that the problem with Carbon Fiber aside from possible manufacturing defects is that the resins grow more and more brittle with age. After two years or so they can grow so brittle that the ultra-lights can fail at any second. This is why Colnago will only give two year warranties and why they build their "light" bikes considerably heavier than other manufacturers.

Have a good ride on your CF when you can get the same weight with an aluminum frame.


Colnago doesn't have the know how to build light CF bikes that last and/or stiff enough so the answer of Ernesto doesn't surprise me.
Something like Kodak that didn't know anything about digital camera's.

Show me an aluminum frame of 850 grams. Any frame lighter than 1300 gram I prefer the CF one. YMMV.

Lou


Lou - what frame of ANY sort weighs a lb and three quarters? I saw and Eddy Merckx aluminum frame and fork that weighed 4 lbs. On steel bike maker tells me that he is making 16 lb bikes all up.

What would YOU use a 12 lb all up bike for?
  #4  
Old January 10th 17, 09:11 PM posted to rec.bicycles.tech
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Default New Carbon Fiber Information

On Tuesday, January 10, 2017 at 6:48:20 AM UTC-8, wrote:
A friend who speaks Italian spoke with a bike builder in Italy who spoke to Ernesto Colnago. He verified that the problem with Carbon Fiber aside from possible manufacturing defects is that the resins grow more and more brittle with age. After two years or so they can grow so brittle that the ultra-lights can fail at any second. This is why Colnago will only give two year warranties and why they build their "light" bikes considerably heavier than other manufacturers.

Have a good ride on your CF when you can get the same weight with an aluminum frame.


I don't know how many of you besides Joerge make a habit of hard climbs. But light bikes do NOT make hard climbs much easier. In fact they add a lot of problems. Once the grade gets up to 18% you can't use low gears because on the light bikes it will lift the front wheel off of the ground. The bike will then pivot around the rear wheel and if you're ready for that you can lay the bike over before it turns down hill.

The way professional climbers get away with this is that they use LARGE gears. Then you don't have the leverage to lift the front wheel.

I haven't heard anyone here talking as if they were pro racers so again and again I am wondering what you would do with these super-light and very unreliable bikes. I'm sure you guys are using ultra-low gears to climb with. I'm not that good of a climber but I can run down most of the best around here if I'm in the mood. I can even give them a quarter mile lead on a hard climb.

FSA carbon cranks - one dealer says that he has had two failures just in his shop
Campy Carbon cranks - three failures in the same shop
Carbon seat posts - the most unreliable part on a carbon bike.
Carbon stems/bar combinations - I have seen these failures myself
Carbon bars - also unreliable
Carbon forks - I have had three of them break. One I spotted before total failure. One permanently injured me. The third just crashed me in a high speed downhill.
Carbon frames - I have point out several cracks in major high end manufacturers to their owners.
Carbon saddles - my brother who is 8" shorter than me and 40 lbs lighter was breaking them every six months but he wanted "the lightest".


  #5  
Old January 10th 17, 10:25 PM posted to rec.bicycles.tech
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Default New Carbon Fiber Information

On Tuesday, January 10, 2017 at 9:56:04 PM UTC+1, wrote:
On Tuesday, January 10, 2017 at 11:33:43 AM UTC-8, wrote:
On Tuesday, January 10, 2017 at 3:48:20 PM UTC+1, wrote:
A friend who speaks Italian spoke with a bike builder in Italy who spoke to Ernesto Colnago. He verified that the problem with Carbon Fiber aside from possible manufacturing defects is that the resins grow more and more brittle with age. After two years or so they can grow so brittle that the ultra-lights can fail at any second. This is why Colnago will only give two year warranties and why they build their "light" bikes considerably heavier than other manufacturers.

Have a good ride on your CF when you can get the same weight with an aluminum frame.


Colnago doesn't have the know how to build light CF bikes that last and/or stiff enough so the answer of Ernesto doesn't surprise me.
Something like Kodak that didn't know anything about digital camera's.

Show me an aluminum frame of 850 grams. Any frame lighter than 1300 gram I prefer the CF one. YMMV.

Lou


Lou - what frame of ANY sort weighs a lb and three quarters?


My CF frame (850 gr doesn't include fork). Last 2 seasons I rode this bike

https://picasaweb.google.com/1010765...CPnlxYTUi5_zfA

Best bike I ever had. I replaced the seat post with a Thomson Masterpiece because the CF Ritchey post kept creaking because of a design flaw.

I saw and Eddy Merckx aluminum frame and fork that weighed 4 lbs. On steel bike maker tells me that he is making 16 lb bikes all up.

What would YOU use a 12 lb all up bike for?


Climbing and descending famous mountain passes in Europe for instance this year (a selection):

http://lh3.googleusercontent.com/-zt...o/IMG_1499.JPG

http://lh3.googleusercontent.com/-wP...o/IMG_1493.JPG

http://lh3.googleusercontent.com/-fq...o/IMG_1495.JPG


Lou
  #6  
Old January 10th 17, 11:06 PM posted to rec.bicycles.tech
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Posts: 3,345
Default New Carbon Fiber Information

On Tuesday, January 10, 2017 at 2:26:04 PM UTC-8, wrote:
On Tuesday, January 10, 2017 at 9:56:04 PM UTC+1, wrote:
On Tuesday, January 10, 2017 at 11:33:43 AM UTC-8, wrote:
On Tuesday, January 10, 2017 at 3:48:20 PM UTC+1, wrote:
A friend who speaks Italian spoke with a bike builder in Italy who spoke to Ernesto Colnago. He verified that the problem with Carbon Fiber aside from possible manufacturing defects is that the resins grow more and more brittle with age. After two years or so they can grow so brittle that the ultra-lights can fail at any second. This is why Colnago will only give two year warranties and why they build their "light" bikes considerably heavier than other manufacturers.

Have a good ride on your CF when you can get the same weight with an aluminum frame.

Colnago doesn't have the know how to build light CF bikes that last and/or stiff enough so the answer of Ernesto doesn't surprise me.
Something like Kodak that didn't know anything about digital camera's..

Show me an aluminum frame of 850 grams. Any frame lighter than 1300 gram I prefer the CF one. YMMV.

Lou


Lou - what frame of ANY sort weighs a lb and three quarters?


My CF frame (850 gr doesn't include fork). Last 2 seasons I rode this bike

https://picasaweb.google.com/1010765...CPnlxYTUi5_zfA

Best bike I ever had. I replaced the seat post with a Thomson Masterpiece because the CF Ritchey post kept creaking because of a design flaw.

I saw and Eddy Merckx aluminum frame and fork that weighed 4 lbs. On steel bike maker tells me that he is making 16 lb bikes all up.

What would YOU use a 12 lb all up bike for?


Climbing and descending famous mountain passes in Europe for instance this year (a selection):

http://lh3.googleusercontent.com/-zt...o/IMG_1499.JPG

http://lh3.googleusercontent.com/-wP...o/IMG_1493.JPG

http://lh3.googleusercontent.com/-fq...o/IMG_1495.JPG


Lou


What - are you the punk kid of the group? Your bike isn't geared particularly low. These days I'm seeing more and more compacts with a 34 on the back. And I thought my 39-28 was cheating after the 39-25. But I do carry a triple now do that anything over 14% I use the 30-25 or so. But there are VERY few extended climbs over 12% around here.

While the Gavia and the Umbrail aren't particularly high they are known for their difficulty because of the speed of the climbs by the pro peloton.

The first one I recognize but can't place it.

The death ride is about the same sort of riding and the roads are a whole lot better. It has a total climb of around 50,000 ft. But it isn't much fun. You have people flying by you only to be laying on the ground trying to catch their breath 5 miles further on. Somewhere or another I went over a pass that was over 10,000 ft. That's when the air REALLY gets thin.
  #8  
Old January 11th 17, 01:56 AM posted to rec.bicycles.tech
James[_8_]
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Posts: 6,153
Default New Carbon Fiber Information

On 11/01/17 08:11, wrote:
On Tuesday, January 10, 2017 at 6:48:20 AM UTC-8,
wrote:
A friend who speaks Italian spoke with a bike builder in Italy who
spoke to Ernesto Colnago. He verified that the problem with Carbon
Fiber aside from possible manufacturing defects is that the resins
grow more and more brittle with age. After two years or so they can
grow so brittle that the ultra-lights can fail at any second. This
is why Colnago will only give two year warranties and why they
build their "light" bikes considerably heavier than other
manufacturers.

Have a good ride on your CF when you can get the same weight with
an aluminum frame.


I don't know how many of you besides Joerge make a habit of hard
climbs. But light bikes do NOT make hard climbs much easier. In fact
they add a lot of problems. Once the grade gets up to 18% you can't
use low gears because on the light bikes it will lift the front wheel
off of the ground. The bike will then pivot around the rear wheel and
if you're ready for that you can lay the bike over before it turns
down hill.


That's funny. The difference between a light bike and a "normal" road
bike might be a 1-2kg. Compared to the body weight of the rider at
70-80kg, this is nothing - and it is a distributed weigh loss over the
entire bike, not just the front end.

Experienced cyclists move their body weight forward to keep the front
wheel on the ground and maintain traction with very low gears. MTB
riders have been doing it for decades.


The way professional climbers get away with this is that they use
LARGE gears. Then you don't have the leverage to lift the front
wheel.


BS.

I haven't heard anyone here talking as if they were pro racers so
again and again I am wondering what you would do with these
super-light and very unreliable bikes. I'm sure you guys are using
ultra-low gears to climb with. I'm not that good of a climber but I
can run down most of the best around here if I'm in the mood. I can
even give them a quarter mile lead on a hard climb.

FSA carbon cranks - one dealer says that he has had two failures just
in his shop Campy Carbon cranks - three failures in the same shop
Carbon seat posts - the most unreliable part on a carbon bike. Carbon
stems/bar combinations - I have seen these failures myself Carbon
bars - also unreliable Carbon forks - I have had three of them break.
One I spotted before total failure. One permanently injured me. The
third just crashed me in a high speed downhill. Carbon frames - I
have point out several cracks in major high end manufacturers to
their owners. Carbon saddles - my brother who is 8" shorter than me
and 40 lbs lighter was breaking them every six months but he wanted
"the lightest".



--
JS
 




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