Reparing a Cannondale frame?

I recently broke the rear deraileur hanger off my Cannondale aluminum frame while trying to
straighten it out. Any opinions about whether a repair is possible, and what it might cost?

 

In article <[email protected]>, Otto <[email protected]> wrote:
>I recently broke the rear deraileur hanger off my Cannondale aluminum frame while trying to
>straighten it out. Any opinions about whether a repair is possible,

Here's one idea:

http://www.yellowjersey.org/rlfix.html

The problem with welding a Cannondale is that heat treating is necessary afterwards.

--Paul

 

$17 for a replaceable hangar. If it is a non replaceable hangar, you may want another frame.

On Mon, 19 May 2003 19:06:20 GMT, "Otto" <[email protected]> wrote:

>I recently broke the rear deraileur hanger off my Cannondale aluminum frame while trying to
>straighten it out. Any opinions about whether a repair is possible, and what it might cost?

 

"Otto" <[email protected]> wrote in message news:[email protected]...
> I recently broke the rear deraileur hanger off my Cannondale aluminum frame while trying to
> straighten it out. Any opinions about whether a repair is possible, and what it might cost?
>

Most recent cannondales that I can remember had replaceable der. hanger inserts ( three little allen
screws holding it in ). If it is not, you may be able to find an aftermarket hanger that bolts on.
Otherwise, I 'd contact Cannondale directly to see how much they would charge to repair it. Or
perhaps they might offer a credit towards a replacement frame.

 

>I recently broke the rear deraileur hanger off my Cannondale aluminum frame while trying to
>straighten it out. Any opinions about whether a repair is possible, and what it might cost?
>

This is one for the few times that just welding might be OK. If it's the non removeable hanger just
cut one off a scrap frame and have a good local welder TIG it on. The lack of heat treatment isn't
really critical in this instance. Phil Brown

 

Otto wrote:
> I recently broke the rear deraileur hanger off my Cannondale aluminum frame while trying to
> straighten it out. Any opinions about whether a repair is possible, and what it might cost?
>
Before trying local welders (etc.), I'd check with my local Cannondale dealer and see what
they suggest.

David

 

agreed, though it must be a pretty old C'dale not to have a replacable hanger

"Phil Brown" <[email protected]> wrote in message
news:[email protected]...
>I recently broke the rear deraileur hanger off my Cannondale aluminum frame while trying to
>straighten it out. Any opinions about whether a repair is possible, and what it might cost?
>

This is one for the few times that just welding might be OK. If it's the non removeable hanger just
cut one off a scrap frame and have a good local welder TIG it on. The lack of heat treatment isn't
really critical in this instance. Phil Brown

 

>This is one for the few times that just welding might be OK. If it's the non removeable hanger just
>cut one off a scrap frame and have a good local welder TIG it on. The lack of heat treatment isn't
>really critical in this instance.

>Phil Brown

I think you have a good point. The only stresses in that part of the dropout are from the derailleur
hanger itself so the integrity of the frame is not really compromised. A good man with a tig would
be quick and only heat a very small area.

I am glad you pointed this out because I have an old GT Zaskar which does not have a replaceable
hanger and i have wondered what I would do if damaged it. Now I know.

The cheapest fix is probably to buy one of the steel derailleur hangers that come on cheap
department store bikes and make it work.

Jon Isaacs

 

Jon Isaacs wrote:
>>This is one for the few times that just welding might be OK. If it's the non removeable hanger
>>just cut one off a scrap frame and have a good local welder TIG it on. The lack of heat treatment
>>isn't really critical in this instance.
>
>
>>Phil Brown
>
>
> I think you have a good point. The only stresses in that part of the dropout are from the
> derailleur hanger itself so the integrity of the frame is not really compromised. A good man with
> a tig would be quick and only heat a very small area.
>
> I am glad you pointed this out because I have an old GT Zaskar which does not have a replaceable
> hanger and i have wondered what I would do if damaged it. Now I know.
>
> The cheapest fix is probably to buy one of the steel derailleur hangers that come on cheap
> department store bikes and make it work.

Or, buy one of Cannondale's replacable ones and make it work

David

 

In article <[email protected]>, [email protected] (Jon Isaacs) wrote:
>>This is one for the few times that just welding might be OK. If it's the non removeable hanger
>>just cut one off a scrap frame and have a good local welder TIG it on. The lack of heat treatment
>>isn't really critical in this instance.
>
>>Phil Brown
>
>I think you have a good point. The only stresses in that part of the dropout are from the
>derailleur hanger itself so the integrity of the frame is not really compromised. A good man with a
>tig would be quick and only heat a very small area.
>
>I am glad you pointed this out because I have an old GT Zaskar which does not have a replaceable
>hanger and i have wondered what I would do if damaged it. Now I know.
>
>The cheapest fix is probably to buy one of the steel derailleur hangers that come on cheap
>department store bikes and make it work.

Last spring I noticed a crack in my Cannondale frame on the right chainstay about 2-3 cm from the
dropout. The tube was nearly off. I friend of my welded it and the welding seems to be OK. My friend
estimated that the strenght has been reduced by 30%.

I will continue to use the bike and I will look for any new cracks in the area before and after
every ride.

Jørn Dahl-Stamnes, EDB Teamco AS e-mail: [email protected] (remove nospam first)
web: http://spiderman.novit.no/dahls/