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Old 04-09-14, 09:55 AM   #1
chonger91
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Broken Rear Derailleur :(

I recently bought a 1983 Schwinn Super Sport. The rear derailluer just broke during my first commute to work. I'm curious what it would cost to replace it. It had a Suntour ARX. The arm just afer the mounting bolt completely snapped off, so most of the actual deralleur is just hanging. I'll try to post pics.

I'm new to road bikes so I need to know, can a modern derailleur be used in it's place? Would any other components have to be upgraded as well then? What should I expect to spend? Thanks for the help in advance.

EDIT: Sorry, I'm not familiar with the terms yet. The shifters are located on the slanted downtube, not on the handlebars.

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Last edited by chonger91; 04-09-14 at 10:20 AM. Reason: Add photo
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Old 04-09-14, 10:06 AM   #2
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I assume an 83 Schwinn has friction shifters?
IF so, most anything that has the proper capacity and mounting system.
A Shimano Tourney should be adequate, low cost and comes in both mounting styles.
It'll handle about any combination of cog/ring sizes.
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Old 04-09-14, 10:12 AM   #3
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Specifics always help, but this is a quick overview.

First of all, is the hanger on the frame OK, or does it use a claw (bolted on) mount? The answers will determine if repair is possible.

Then your choice of derailleurs is related to whether you have index shifting or not. If not indexed, you have a wide field to choose from. However index shiftings could need a compatible derailleur, so specifics are needed.

Given the question, I gather that you're new to bike wrenching, so you n=might be beat served with a visit to shop or bike co-op. If there's no co-op, look for a fixit bike shop, that focuses on repairs, rather then a high end shop focused on sales.
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Old 04-09-14, 10:28 AM   #4
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Pretty much any cheap new Shimano derailleur will work with what you have going on there. Tourney was mentioned, you could go another level up to (mtn) Altus or Acera, (rd) 2300 or Claris and stay in the $20-30 range.
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Old 04-09-14, 01:57 PM   #5
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WOW. That is some material failure right there, wonder if it was just improperly cast or tempered or what. Check your PMs (can people with <50 posts receive them?)
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Old 04-09-14, 02:08 PM   #6
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Originally Posted by awfulwaffle View Post
WOW. That is some material failure right there, wonder if it was just improperly cast or tempered or what. Check your PMs (can people with <50 posts receive them?)

Got your PM but I couldn't respond til I hit 50 posts. Thanks for the offer! I might take you up on that. I'll get back to you in a few days if that's ok.

I contacted the seller of the bike from craigslist (just bought it 2 days ago). He actually told me to bring it to the LBS where he works on saturday and he might be able to replace it for free. Very surprising for craigslist, so I'm hoping he's for real. I'll let you know.
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Old 04-09-14, 02:09 PM   #7
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Looking at the photo, here's what I think might have happened. (just a theory).

If you look at the dropout slot, it appears that it's pulled open a bit (could be the photo), and the RD itself has the scratches on the outside indicative of hitting the pavement (just about all well used RDs have this because stuff happens).

So, putting both together, I suspect that the RD hanger might have been bent in when the bike fell over, or from multiple drops. That allowed the RD to over-shift into the wheel, which pulled it back snapping the body. Look at the stop cam, where there seems to be some evidence of this.

If I'm right, you got off with some luck, because this often snaps the rear dropout, totaling the frame.

So, any compitable RD, and there are many, but you also have to have the dropout slot and hanger corrected, to complete the job. The frame work is straightforward and any competent mechanic should be able to handle it at a reasonable cost.
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Old 04-09-14, 03:49 PM   #8
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Quote:
Originally Posted by chonger91 View Post
Got your PM but I couldn't respond til I hit 50 posts. Thanks for the offer! I might take you up on that. I'll get back to you in a few days if that's ok.

I contacted the seller of the bike from craigslist (just bought it 2 days ago). He actually told me to bring it to the LBS where he works on saturday and he might be able to replace it for free. Very surprising for craigslist, so I'm hoping he's for real. I'll let you know.

Sounds good, just quote me in this thread or something if that doesn't end up working out.
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Old 04-23-14, 09:44 AM   #9
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[MENTION=348670]awfulwaffle[/MENTION] Sorry, I haven't been online for a while. Just wanted to let you know I'm all set. I met up with the seller from craigslist and he replaced the derailleur. He also found an issue with the rear cogs, so he swapped out the whole rear wheel. Totally free!
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Old 04-23-14, 11:21 AM   #10
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Now that's what I call after-sale service! Glad it worked out for you.
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Old 04-23-14, 05:07 PM   #11
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Originally Posted by chonger91 View Post
@awfulwaffle Sorry, I haven't been online for a while. Just wanted to let you know I'm all set. I met up with the seller from craigslist and he replaced the derailleur. He also found an issue with the rear cogs, so he swapped out the whole rear wheel. Totally free!
Glad to hear it, that's pretty rare for most CL sellers.
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Old 04-23-14, 05:45 PM   #12
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Originally Posted by awfulwaffle View Post
WOW. That is some material failure right there, wonder if it was just improperly cast or tempered or what. Check your PMs (can people with <50 posts receive them?)
if the part has lasted for more than thirty years
it is very unlikely that it was defective
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Old 04-23-14, 06:00 PM   #13
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if the part has lasted for more than thirty years
it is very unlikely that it was defective
I dunno, methinks it depends on the conditions under which it spent those 30+ years.
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