Reparing a Cannondale frame?

In article said:

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:

yellowjersey.orgrlfix.htmlOpen ↗

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.

Otto said:

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 hidden]> wrote in message "]news:[email hidden]...

Quoted message said:

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.

Quoted message said:

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 said:

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 hidden]> wrote in message
"]news:[email hidden]...

Quoted message said:

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

Quoted message said:

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.

Quoted message said:

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 said:

Quoted message said:

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.

Quoted message said:

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 said:

Quoted message said:

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.

Quoted message said:

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 hidden] (remove nospam first)
web: spiderman.novit.nodahlsOpen ↗