RD mount is broken off.
 

Is there a fix for a RD drop that has been broken off of an aluminum frame? This is an old Cannondale that is a fairly nice frame with steel forks. There is no model number or name on the frame. It has verticle dropouts, Suntour cyclone hubs, Shimano 600 areo pedals and Ambrosio 19 rims.

If it's not a replaceable dropout, you need a frame repair guy or a frame builder. I have no idea the cost, but anything can be fixed, but the amount to repair it may be prohibitive. There are people that can fix it.

If you can post or link to a pic of the whole rear triangle including chainset , and also closeup of damaged part, Jim'll Fix It. Or somebody. Options run from weld if you still have the part, to sawing and filing up a alloy screw onto stay holder for your DR. You might even get away with a standard steel adaptable hanger. Might require a bit of knocking about with a hammer, but that's fun too.

Another option is you file the ofending part of frame flat, polish it, and sell it 800 bucks as a way cool fixie.

I guess the vertical drop outs rule out a claw type hanger. Could an aluminum frame even have the drop out replaced by a frame builder?

pic of the broken rd drop. .....Looks like I may have some components for sale.:( I am not willing to put a lot of money in the frame though if it is fixable it would have made someone a nice rider.

I was just looking into some "replaceable derailleur hangers ". It should be done on a Mill but I see no reason that one of these could not be retro fitted to fix this problem. Has any one ever done this or would I be breaking new ground? I think that with some care it could be done with a dremel but a mill would by far be the best.

Yes, it's possible. I've heard of at least one person who found a replaceable hanger that would fit the shape of his existing dropout, and subsequently had the dropout thinned where necessary to match the pattern of the replaceable hanger.

Expensive, tedious job, but worth it - especially when the result yields you a nice period Cannondale that will never have this problem again, so long as you can source replacement hangers.

-Kurt

That sounds like a decent fix to me. The problem will be in finding a suitable hanger. I am not exactly in the center of the cycling mecca here. hehehe

dit are you the orginal owner? it is certanly worth a trip to your cannondale dealer. is that road or ATB? if you are the original owner you may be able to get some sort of credit towards a new frame. or cannondale may already have a repair kit for that frame. I recall at one time in the mid '90s putting a cannondale replacement hanger on an old ATB (24" rear wheel) and it only required a bit of drilling and one minot cut to fit it in place. just a thought

hey Bianchigirll... ... I bought the bike with the damage. The fella I bought it from was the original owner and he did get a deal on a new CAAD 9. (nice machine btw) I bought it thinking that there would be a way to fix it and if not, the components would fetch enough $$ to more than cover my investment. I would just like to fix it to get it back on the road for somebody. I understand that this is a common problem for these old Cannondale frames so there may be ready made drop repair. I will check it out with Cannondale. The local dealer probably would have no clue. The closest decent lbs is about 60 miles and since I am not a regular customer they usually rip me pretty good.

This thing is a 86 SR600 thanks to Chuckk

oh ic well then he got lucky. the policy used to be to cut the ser number off rendering the frame useless