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New Carbon Fiber Information



 
 
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Old January 11th 17, 11:47 PM posted to rec.bicycles.tech
James[_8_]
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Posts: 6,153
Default New Carbon Fiber Information

On 12/01/17 03:30, wrote:
On Tuesday, January 10, 2017 at 5:56:41 PM UTC-8, James wrote:
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.


James, you are FAR out of it. A "light" bike now is under six kg and
possibly down to 5 1/2.


Not in a UCI sanctioned event it's not. 6.8kg is the lightest.

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.


Modern bicycle design with short wheelbases and long top tubes do not
allow you to shift your center of gravity forward unless you can
stand up.


Bull****. They haven't changed the seat post angle of the position of
the seat relative to the crank axle, so you can most certainly slide
forward on the seat regardless of the wheelbase and top tube.

And you can't stand on the pedals on steep hills where you
have to pedal circles.


Sure you can. Drop a couple if cogs and stand up.



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.


George Hincapie won a mountain stage of the Tour even though he is a
sprinter. His gear was a 23 and that was the lowest gear of the group
going over the top.


So what?

--
JS
 




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