What is your experience with good paint jobs on Carbon Fiber bikes. Trek was one of the first to begin building CF bikes and their paint held up so well that some of the original frames and forks can look like new,

Colnago on the other hand has paint jobs that are often broken and cracked around where the bike could be expected to flex. I don't know if this is from thicker and more ridged paint or from the Italian-made Colnago bikes tendency to flex a lot more.

The paint on my Taiwanese Colnago is perfect. But bikes like the C40 and the like have a lot of cracking in the paint around the lugs. I was never a fan of lugs on CF bikes but Colnago has used this method on their Italian made series up to today.

On Wednesday, February 23, 2022 at 6:36:41 PM UTC+1, Tom Kunich wrote:
> What is your experience with good paint jobs on Carbon Fiber bikes. Trek was one of the first to begin building CF bikes and their paint held up so well that some of the original frames and forks can look like new,
>
> Colnago on the other hand has paint jobs that are often broken and cracked around where the bike could be expected to flex. I don't know if this is from thicker and more ridged paint or from the Italian-made Colnago bikes tendency to flex a lot more.
>
> The paint on my Taiwanese Colnago is perfect. But bikes like the C40 and the like have a lot of cracking in the paint around the lugs. I was never a fan of lugs on CF bikes but Colnago has used this method on their Italian made series up to today.

Wow, wow. The track record of the early CF Trek frames were not that good. It varied a lot. Two riding buddies had the paint chipped off their Trek frames. One got a replacement because it was within the 1 year warranty period and the other waited too long and his frame was not replaced because the mechanical integrity was still intact. It was pure cosmetic. There you go. His frame looked awful within a year. I am not into paint jobs. Only clear coat. It is lighter too ;-)

Lou

On 2/23/2022 12:01 PM, Lou Holtman wrote:
> On Wednesday, February 23, 2022 at 6:36:41 PM UTC+1, Tom Kunich wrote:
>> What is your experience with good paint jobs on Carbon Fiber bikes. Trek was one of the first to begin building CF bikes and their paint held up so well that some of the original frames and forks can look like new,
>>
>> Colnago on the other hand has paint jobs that are often broken and cracked around where the bike could be expected to flex. I don't know if this is from thicker and more ridged paint or from the Italian-made Colnago bikes tendency to flex a lot more.
>>
>> The paint on my Taiwanese Colnago is perfect. But bikes like the C40 and the like have a lot of cracking in the paint around the lugs. I was never a fan of lugs on CF bikes but Colnago has used this method on their Italian made series up to today.
>
> Wow, wow. The track record of the early CF Trek frames were not that good. It varied a lot. Two riding buddies had the paint chipped off their Trek frames. One got a replacement because it was within the 1 year warranty period and the other waited too long and his frame was not replaced because the mechanical integrity was still intact. It was pure cosmetic. There you go. His frame looked awful within a year. I am not into paint jobs. Only clear coat. It is lighter too ;-)
>
>
> Lou
>
+1
Except for the Trek 5000, secod series early models were
aluminum joints glued to carbon tubes and those had a
problem with galvanic corrosion.

--
Andrew Muzi
<www.yellowjersey.org/>
Open every day since 1 April, 1971

On Wed, 23 Feb 2022 14:23:43 -0600,
AMuzi <am@yellowjersey.org> wrote:
> On 2/23/2022 12:01 PM, Lou Holtman wrote:
> > On Wednesday, February 23, 2022 at 6:36:41 PM UTC+1, Tom Kunich wrote:
> >> What is your experience with good paint jobs on Carbon Fiber
> >> bikes. Trek was one of the first to begin building CF bikes
> >> and their paint held up so well that some of the original
> >> frames and forks can look like new,
> >>
> >> Colnago on the other hand has paint jobs that are often
> >> broken and cracked around where the bike could be expected to
> >> flex. I don't know if this is from thicker and more ridged
> >> paint or from the Italian-made Colnago bikes tendency to flex
> >> a lot more.
> >>
> >> The paint on my Taiwanese Colnago is perfect. But bikes like
> >> the C40 and the like have a lot of cracking in the paint
> >> around the lugs. I was never a fan of lugs on CF bikes but
> >> Colnago has used this method on their Italian made series up
> >> to today.
> >
> > Wow, wow. The track record of the early CF Trek frames were
> > not that good. It varied a lot. Two riding buddies had the
> > paint chipped off their Trek frames. One got a replacement
> > because it was within the 1 year warranty period and the other
> > waited too long and his frame was not replaced because the
> > mechanical integrity was still intact. It was pure cosmetic.
> > There you go. His frame looked awful within a year. I am not
> > into paint jobs. Only clear coat. It is lighter too ;-)

> +1
> Except for the Trek 5000, secod series early models were
> aluminum joints glued to carbon tubes and those had a problem
> with galvanic corrosion.

Huh, I would not have expected carbon to be part of a galvanic
couple, is there something else in the material (or the way it's
constructed) that makes it electrically active?

--
Ted Heise <theise@panix.com> West Lafayette, IN, USA

On Wed, 23 Feb 2022 22:14:59 -0000 (UTC), Ted Heise <theise@panix.com>
wrote:

>On Wed, 23 Feb 2022 14:23:43 -0600,
> AMuzi <am@yellowjersey.org> wrote:
>> On 2/23/2022 12:01 PM, Lou Holtman wrote:
>> > On Wednesday, February 23, 2022 at 6:36:41 PM UTC+1, Tom Kunich wrote:
>> >> What is your experience with good paint jobs on Carbon Fiber
>> >> bikes. Trek was one of the first to begin building CF bikes
>> >> and their paint held up so well that some of the original
>> >> frames and forks can look like new,
>> >>
>> >> Colnago on the other hand has paint jobs that are often
>> >> broken and cracked around where the bike could be expected to
>> >> flex. I don't know if this is from thicker and more ridged
>> >> paint or from the Italian-made Colnago bikes tendency to flex
>> >> a lot more.
>> >>
>> >> The paint on my Taiwanese Colnago is perfect. But bikes like
>> >> the C40 and the like have a lot of cracking in the paint
>> >> around the lugs. I was never a fan of lugs on CF bikes but
>> >> Colnago has used this method on their Italian made series up
>> >> to today.
>> >
>> > Wow, wow. The track record of the early CF Trek frames were
>> > not that good. It varied a lot. Two riding buddies had the
>> > paint chipped off their Trek frames. One got a replacement
>> > because it was within the 1 year warranty period and the other
>> > waited too long and his frame was not replaced because the
>> > mechanical integrity was still intact. It was pure cosmetic.
>> > There you go. His frame looked awful within a year. I am not
>> > into paint jobs. Only clear coat. It is lighter too ;-)
>
>> +1
>> Except for the Trek 5000, secod series early models were
>> aluminum joints glued to carbon tubes and those had a problem
>> with galvanic corrosion.
>
>Huh, I would not have expected carbon to be part of a galvanic
>couple, is there something else in the material (or the way it's
>constructed) that makes it electrically active?

Carbon fiber does conduct electricity however the Epoxy used to bond
the fibers is, I believe, an insulator, so a carbon fiber frame may be
a conductor.
--
Cheers,

John B.

On 2/23/2022 4:14 PM, Ted Heise wrote:
> On Wed, 23 Feb 2022 14:23:43 -0600,
> AMuzi <am@yellowjersey.org> wrote:
>> On 2/23/2022 12:01 PM, Lou Holtman wrote:
>>> On Wednesday, February 23, 2022 at 6:36:41 PM UTC+1, Tom Kunich wrote:
>>>> What is your experience with good paint jobs on Carbon Fiber
>>>> bikes. Trek was one of the first to begin building CF bikes
>>>> and their paint held up so well that some of the original
>>>> frames and forks can look like new,
>>>>
>>>> Colnago on the other hand has paint jobs that are often
>>>> broken and cracked around where the bike could be expected to
>>>> flex. I don't know if this is from thicker and more ridged
>>>> paint or from the Italian-made Colnago bikes tendency to flex
>>>> a lot more.
>>>>
>>>> The paint on my Taiwanese Colnago is perfect. But bikes like
>>>> the C40 and the like have a lot of cracking in the paint
>>>> around the lugs. I was never a fan of lugs on CF bikes but
>>>> Colnago has used this method on their Italian made series up
>>>> to today.
>>>
>>> Wow, wow. The track record of the early CF Trek frames were
>>> not that good. It varied a lot. Two riding buddies had the
>>> paint chipped off their Trek frames. One got a replacement
>>> because it was within the 1 year warranty period and the other
>>> waited too long and his frame was not replaced because the
>>> mechanical integrity was still intact. It was pure cosmetic.
>>> There you go. His frame looked awful within a year. I am not
>>> into paint jobs. Only clear coat. It is lighter too ;-)
>
>> +1
>> Except for the Trek 5000, secod series early models were
>> aluminum joints glued to carbon tubes and those had a problem
>> with galvanic corrosion.
>
> Huh, I would not have expected carbon to be part of a galvanic
> couple, is there something else in the material (or the way it's
> constructed) that makes it electrically active?
>

https://digitalcommons.du.edu/etd/1120/

https://2rs96t43w34o3j74jt28p2ie-wpengine.netdna-ssl.com/wp-content/uploads/2019/10/Corrosion-tests-NYSHIELD.png

example:
https://a4.pbase.com/o9/43/361043/1/158998937.DsPvq6ws.Geo_bale_guide_front_painted.JPG

--
Andrew Muzi
<www.yellowjersey.org/>
Open every day since 1 April, 1971

On Wed, 23 Feb 2022 19:37:41 -0600,
AMuzi <am@yellowjersey.org> wrote:
> On 2/23/2022 4:14 PM, Ted Heise wrote:
> > On Wed, 23 Feb 2022 14:23:43 -0600,
> > AMuzi <am@yellowjersey.org> wrote:

> >> Except for the Trek 5000, secod series early models were
> >> aluminum joints glued to carbon tubes and those had a
> >> problem with galvanic corrosion.
> >
> > Huh, I would not have expected carbon to be part of a galvanic
> > couple, is there something else in the material (or the way
> > it's constructed) that makes it electrically active?
>
> https://digitalcommons.du.edu/etd/1120/
>
> https://2rs96t43w34o3j74jt28p2ie-wpengine.netdna-ssl.com/wp-content/uploads/2019/10/Corrosion-tests-NYSHIELD.png
>
> example:
> https://a4.pbase.com/o9/43/361043/1/158998937.DsPvq6ws.Geo_bale_guide_front_painted.JPG

Thanks, both.

--
Ted Heise <theise@panix.com> West Lafayette, IN, USA