Carbon bike derailer broken

kevingleeson

Hi guys I am looking at a carbon bike for sale where guy has broken off the front derailer. It is a large oval tubed frame so not sure how could fit a new one but guy is suggesting drilling the carbon frame and screwing one on.

Any opinions welcome and its sunning shimano ultegra.

ednwireland

i guessing he's broken the mounting rather than just the FD

i would say that if the carbons broken its beyond reasonable cost repair if its just a matter of trying to get the mounting and rivetting in a new one its possible (in my mind anyway)

honestly its probably been crashed and possibly had more damage, not sure i'd trust a crashed (by someone else ) frame

kevingleeson

Well I havent seen the bike in person yet but he is sending me on some detailed pictrues today but assures me frame of actual bike is unmarked.

It is just the mounting that is damaged, are tehse mountings easily available

kenmc

kevingleeson wrote: »

Well I havent seen the bike in person yet but he is sending me on some detailed pictrues today but assures me frame of actual bike is unmarked.

It is just the mounting that is damaged, are tehse mountings easily available

Personally I wouldn't go drilling into any carbon (or indeed alu or steel) tubes on a bike. You have no idea what way the stresses are being transmitted through the frame and if you will create a weak spot.

You *might* be able to get a band-on front mech, but don't go overclamping it either or you could crack the frame too.

kevingleeson

Yes, totally agree re drilling frame of such a high end market bike, band on derialer looks like my solution but fine for your regular road bike, this frame is more triathlon style so bars quite large and ovaled.

Lumen

kenmc wrote: »

Personally I wouldn't go drilling into any carbon (or indeed alu or steel) tubes on a bike.

I think it is quite normal to drill carbon frames for Di2 installations.

kevingleeson

Ok hope to hear this a bit more

kevingleeson

Who are the experts on CF bikes in ireland or close to waterford if possible?? but can travel

LCRC_BAX

kevingleeson wrote: »

but guy is suggesting drilling the carbon frame and screwing one on.

As per other posters I would be very wary of drilling a carbon frame myself, Especially around the bottom of the seat tube which carries a huge amount of forces when riding. You will be creating a weak spot and this runs the risk of failure of the frame.

If the banded clamp won't suit the frame you might be able to make up a bespoke one or possibly bond the bolt on hanger to the frame??

DirkVoodoo

Unless it were a very good deal, I would probably pass over a second hand bike where the owner is suggesting that you start drilling holes in the frame.

What type of frame is it and what groupset? You should be able to get a clamp on adapter for it.

TheBlaaMan

Probably best to bring it to Liam in Spokes, the LBS in Waterford. He knows the Tri scene well, and perhaps even the history of the bike?

In any case, €15-20 to take a few minutes to look over the bike might be money well spent - IF you can convince your seller to bring the bike in to him and you tag along. If he wants the sale, he should agree. If he doesn't, I'd be inclined to walks away........plenty of fish in the sea and you could regret a purchase in haste, no matter how good a deal it may seem.......

kona

Personally Id run a mile, same with any other muppet trying to sell me broken parts.
Look at cars on Donedeal for example, I went to look at a few a few months ago, people saying the car is fine and needs a simple electrical fix, arrive to look at the car and its fit for scrap, there are some heaps on the road, its scarey.

OP save you money and buy something that works, cheap carbon isnt much better than AL weightwise and youl get AL cheaper as it doesnt have the FRED factor.

Captain Havoc

If you're patient you'll get a great deal, I got a couple in the adverts section here last year. There's a few guys who get into cycling and get out of fairly quickly and also some guys who want to make a quick sale to get an upgrade as quick as possible, it's all about patience. Personally if I was unsure about the condition of a bike, I'd just walk away, if the braze is broken then he's obviously put it under a lot of stress by either crashing or forcing his chain when it was caught in the derailleur.

petethedrummer

Is it worth all this hassle for a possibly damaged frame? Are you getting a €5,000 frame for €500 or something? What make of frame is it? And what is your budget?

There are a fair few good deals on new carbon frames on Planet-X, Chainreactions etc....

gman2k

kevingleeson wrote: »

Who are the experts on CF bikes in ireland or close to waterford if possible?? but can travel

Have a chat with Tony O'Mahoney in Dungarvan 05843346. He has done lots of repairs on CF frames.

You could remove what's left of the carbon 'braze on' section from the frame, fit a band on clamp that allows a braze on front der.

I would not be parting with money for a damaged CF frame without the likes of Tony having an eye over it first.

Quigs Snr

Seconded for Tony in Dungarvan, as good as the other shops are, Tony is the only one I am aware of who has done repairs on carbon fibre. But in general, unless this guy is just selling you the groupset and bits of this bike with the frame thrown in for free I probably would run away here...