How to decide what to replace in a bent rear derailleur

Discuss light weight issues concerning road bikes & parts.
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nemeseri
Posts: 684
Joined: Tue Apr 07, 2015 5:40 pm

by nemeseri

So I bought a new bike from ebay and fedex ended up bending both the hanger and the rear derailleur pretty badly. It's pretty clear to me that the outer chain guide plate is bent badly. Sadly it seems that shimano doesn't make this particular plate available to purchase as a separate item (you can buy the inner plate, but not the outer... ).

So should I buy a third party chain guide or just trash the RD and replace it? How can I make sure nothing else is damaged in the RD other than the chain guide?

Please check out the attached picture.

Image

Multebear
Posts: 1062
Joined: Sat May 02, 2015 10:11 pm

by Multebear

Is that a Ultegra RD? Why don't you just buy a new one? They're like 80 buks. And then you'll have those pulley wheels as spare ones.

And buy a new derailleur hanger as well.

by Weenie


ntb1001
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Joined: Tue Sep 16, 2014 4:38 pm

by ntb1001

agree.....just replace

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AJS914
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Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

Does Shimano sell replacement parts?

ntb1001
Posts: 79
Joined: Tue Sep 16, 2014 4:38 pm

by ntb1001

AJS914 wrote:Does Shimano sell replacement parts?
I don't think so...usually just Campagnolo.

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MayhemSWE
Posts: 128
Joined: Thu Mar 12, 2015 12:44 pm
Location: Stockholm, Sweden

by MayhemSWE

nemeseri wrote:Sadly it seems that shimano doesn't make this particular plate available to purchase as a separate item (you can buy the inner plate, but not the outer... ).

Not sure exactly which derailleur you have, looks like some version of Ultegra? Both inner and outer plates are available for all versions of at least M8000 SS and GS, 6800 and 6700 according to the Shimano parts diagrams.

Svetty
Posts: 497
Joined: Thu Mar 26, 2009 11:06 pm
Location: Yorkshire - God's Own Country

by Svetty

I can't see any damage other than a bent hanger? If you re-align this does it shift OK? if so just ride it.....

nemeseri
Posts: 684
Joined: Tue Apr 07, 2015 5:40 pm

by nemeseri

MayhemSWE wrote:
nemeseri wrote:Sadly it seems that shimano doesn't make this particular plate available to purchase as a separate item (you can buy the inner plate, but not the outer... ).

Not sure exactly which derailleur you have, looks like some version of Ultegra? Both inner and outer plates are available for all versions of at least M8000 SS and GS, 6800 and 6700 according to the Shimano parts diagrams.



You are right, I forgot to mention that it's the rd-6800-gs. Although if you look at the parts pdf, there is a part number for the inner plate, but no part number is listed for the outer plate. And I wasn't able to find this particular part online.

http://si.shimano.com/pdfs/ev/EV-RD-6800-3608E.pdf

EDIT: I'm an idiot. The part number is Y5YC98080.

by Weenie


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MayhemSWE
Posts: 128
Joined: Thu Mar 12, 2015 12:44 pm
Location: Stockholm, Sweden

by MayhemSWE

nemeseri wrote:You are right, I forgot to mention that it's the rd-6800-gs. Although if you look at the parts pdf, there is a part number for the inner plate, but no part number is listed for the outer plate. And I wasn't able to find this particular part online.

http://si.shimano.com/pdfs/ev/EV-RD-6800-3608E.pdf

EDIT: I'm an idiot. The part number is Y5YC98080.

If you're interested, I happen to have spare RD-6800-GS plates both inner and outer. Bought them to modify my Dura-Ace Di2 RD-9070 to medium cage but it didn't work out due to the geometry of my rear derailleur hanger.

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