Dura-Ace 7800 Rear Derailleur Tuning

Discuss light weight issues concerning road bikes & parts.
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2ndgen
Posts: 617
Joined: Mon Jul 05, 2010 5:18 pm

by 2ndgen

Has anybody tuned a Dura-Ace 7800 Rear Derailleur?
What savings could I expect if I went with a Fiber-Lyte Carbon, aftermarket pullies and a tuning kit?

jdp211
Posts: 629
Joined: Fri Feb 12, 2010 4:26 am

by jdp211

Though its in German, this thread http://www.forum.light-bikes.de/showthread.php?t=16208 gives a pretty good idea of the potential. I believe he got it down to 93g. Much more than just back plates and pulleys though.

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2ndgen
Posts: 617
Joined: Mon Jul 05, 2010 5:18 pm

by 2ndgen

jdp211 wrote:Though its in German, this thread http://www.forum.light-bikes.de/showthread.php?t=16208" onclick="window.open(this.href);return false; gives a pretty good idea of the potential. I believe he got it down to 93g. Much more than just back plates and pulleys though.


Thanks J! :thumbup:

Horacio
Posts: 216
Joined: Sat Jan 21, 2012 5:28 am

by Horacio

Boy, that thing is hacked up!
But i kinda like it!

rruff
Shop Owner
Posts: 2194
Joined: Sun Jan 08, 2006 9:12 am
Location: Alto, NM

by rruff

jdp211 wrote:I believe he got it down to 93g. Much more than just back plates and pulleys though.


Image

Many photos here: http://www.forum.light-bikes.de/showthr ... 08&page=30

I think with just plates, pulleys, and a bolt kit you are looking at ~30g savings... or ~152g.

xnavalav8r
Posts: 2643
Joined: Mon Jan 21, 2008 12:09 pm

by xnavalav8r

Here is how I got my 182 gram short cage Dura Ace rear derailleur down to 145 grams...

Dura-Ace Rear Derailleur New In Box RD-7800SS short Cage
* Alloy hanger bolt
* Alloy cable clamp bolt
* Alloy plate Axle bolt
* Jagwire carbon Rocket cable adjuster
* KCNC Ceramic Bearing jockey wheels
* Alloy mech jockey bolts
* RS P carbon outer plate
* RS P carbon inner plate
* Titanium Spring

It's not as extreme as the one pictured above, but it was also much easier.

download/file.php?id=29216&mode=view

davej35
Posts: 57
Joined: Sat Feb 18, 2012 9:37 am

by davej35

xnavalav8r wrote:Here is how I got my 182 gram short cage Dura Ace rear derailleur down to 145 grams...

Dura-Ace Rear Derailleur New In Box RD-7800SS short Cage
* Alloy hanger bolt
* Alloy cable clamp bolt
* Alloy plate Axle bolt
* Jagwire carbon Rocket cable adjuster
* KCNC Ceramic Bearing jockey wheels
* Alloy mech jockey bolts
* RS P carbon outer plate
* RS P carbon inner plate
* Titanium Spring

It's not as extreme as the one pictured above, but it was also much easier.

download/file.php?id=29216&mode=view" onclick="window.open(this.href);return false;


Waoww, really decent shape and brutal condition, great job :thumbup:

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2ndgen
Posts: 617
Joined: Mon Jul 05, 2010 5:18 pm

by 2ndgen

rruff wrote:
jdp211 wrote:I believe he got it down to 93g. Much more than just back plates and pulleys though.


Image

Many photos here: http://www.forum.light-bikes.de/showthr ... 08&page=30" onclick="window.open(this.href);return false;

I think with just plates, pulleys, and a bolt kit you are looking at ~30g savings... or ~152g.


Image

User avatar
2ndgen
Posts: 617
Joined: Mon Jul 05, 2010 5:18 pm

by 2ndgen

I'm going to be going with plates & jockey wheels
(though I'll feel safer with metal than carbon for the wheels).
I'll possibly be going with a bolt kit as well.

Does anybody have OEM weight for the jockey wheels and the plates?

drchull
Posts: 377
Joined: Sat Jul 30, 2011 6:38 pm

by drchull

That German link to light bikes is fairly amazing. Just a beautiful job on the RD. Not so sure about the FD or the brakes. The thing I found funny was the amazing amount of work put into shaving 0.2g here and there on the RD and then hanging it on a bike with an Ultegra crank and with the steerer not cut down to length.
Talk about pennywise and pound foolish.

Gane8ha
Posts: 1
Joined: Mon Jun 18, 2018 6:30 am

by Gane8ha

xnavalav8r wrote:
Wed Feb 15, 2012 3:33 pm
Here is how I got my 182 gram short cage Dura Ace rear derailleur down to 145 grams...

Dura-Ace Rear Derailleur New In Box RD-7800SS short Cage
* Alloy hanger bolt
* Alloy cable clamp bolt
* Alloy plate Axle bolt
* Jagwire carbon Rocket cable adjuster
* KCNC Ceramic Bearing jockey wheels
* Alloy mech jockey bolts
* RS P carbon outer plate
* RS P carbon inner plate
* Titanium Spring

It's not as extreme as the one pictured above, but it was also much easier.

download/file.php?id=29216&mode=view" onclick="window.open(this.href);return false;
Hi there, greetings from Bandung, Indonesia.

I really interested in modified my old Dura Ace 7400 rear derailleur, I think I'm going for "Shimergo" set up with 10 speed Campagnolo shifters.

@xnavalav8r Could you inform me where can I get all the WW spare parts for this particular rear derailleur? Sometimes the keywords in searching tab doesn't work. :(

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