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