New??? Rear derailleur Dura-ace 7970-A

Discuss light weight issues concerning road bikes & parts.
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Ritxis
Posts: 237
Joined: Fri Jun 01, 2012 3:00 pm
Location: San Sebastian

by Ritxis

A companion of foromtb, to purchase a rear derailleur new? Dura-ace 7970-a, in appearance is as a RD 9070

it comes with and a e-tube cable, and an adapter from e-tube to connection of the Dura-Ace

Not fake

Date July 2016
http://si.shimano.com/php/download.php? ... 00-SPA.pdf

http://si.shimano.com/php/download.php? ... A-4117.pdf

do not have more information, someone knows something more??

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glepore
Posts: 1103
Joined: Thu Mar 28, 2013 4:42 pm
Location: Pa USA

by glepore

Wow-certainly solves the problem of failures in the originals and replacements disappearing.
Cysco Ti custom Campy SR mechanical (6.9);Cannondale SS Evo Di2 7970 (5.79); Willier Cento Uno Air Di2 9070 (7.0); C40 Mk2 DA 7800 ; Anvil Custom steel Etap;1996 Colnago Technos Record

kulivontot
Posts: 1170
Joined: Sun May 16, 2010 7:28 pm

by kulivontot

I feel like something is lost in translation here, but is this an option to retrofit etube connections to old dura ace 7970 derailleurs?
Very interesting. English instructions available here:
http://si.shimano.com/php/download.php? ... 00-ENG.pdf
It appears Shimano has created a new 10-speed di2 rear derailleur (RD-7970-A) that uses e-tube rather than the old 5-pin dura ace connectors. It uses an additional junction box (SM-RD79-A) to convert from the old style connector (EW-7970) to the new e-tube connectors (EW-SD50). If this is real, that is a great option for people with old groups that have a toasted rear derailleur. What is exciting for me is the potential for purchasing a new 10-speed rear derailleur, as I am building up a gruppo of old 6770 parts and am unable to find a reasonably priced RD. If there was a junction box that converted the reverse, from e-tube from to 5-pin di2, that would be fantastic too as there are a boat load of first-gen 7970 rear derailleurs out there.
Image

kulivontot
Posts: 1170
Joined: Sun May 16, 2010 7:28 pm

by kulivontot

German article describing a return from Shimano in June 2016
http://www.best4cycling.com/2016/06/15/ ... r-was-tun/
UK company apparently selling the 10spd version
http://www.madison.co.uk/products/cycli ... r-ss-cage/

sanrensho
Posts: 410
Joined: Tue Aug 02, 2011 5:54 pm

by sanrensho

I found one link to a Japanese blogger who ordered this from Bike24 and reports that it worked fine (posted in August).

Unfortunately, Bike24 no longer seems to carry it.

kulivontot
Posts: 1170
Joined: Sun May 16, 2010 7:28 pm

by kulivontot

Also a 6770 version apparently!
http://si.shimano.com/php/download.php? ... A-4116.pdf
I'm going to have my shop ask a dealer about this. If I'm going to end up paying $150 for a scratched up 10 speed di2 derailleur, I might as well pay a bit more for a new one.

androidavies
Posts: 74
Joined: Sun Sep 29, 2013 4:34 pm

by androidavies

Madison are the official Shimano UK importer. I think they have a consumer facing site as well, but I'm not sure if you are able to buy direct, normally orders go through a retailer.

They have the 7970a mech in stock. Certainly, a UK retailer with a Madison account could order it for a customer. The current suggested retail is £549! The 6770 is also available new, suggested retail is £249….. I'm sure there would be some room for negotiating a lower purchase price…...

The GB pound has fallen in value quite a bit recently, seems to be resulting in higher prices for this sort of stuff for us in general.

ooo
Posts: 528
Joined: Sat May 21, 2016 12:59 pm

by ooo

RD-6770-A have many parts from RD-6870
RD-7970-A have many parts from RD-9070

not sure if geometry is similar:
http://si.shimano.com/pdfs/ev/EV-RD-6770-A-4116.pdf
http://si.shimano.com/pdfs/ev/EV-RD-7970-A-4117.pdf

at least cage is the same on both
you can upgrade ultegra from SS to GS cage

IRD6770ASS - model number for new RD-6770-A
IRD6770SS - model number for old RD-6770
price range €180+

IRD7970ASS - model number for new RD-7970-A
IRD7970SS - model number for old RD-7970
price range €650+
Last edited by ooo on Tue Mar 21, 2017 9:50 am, edited 1 time in total.
'

kulivontot
Posts: 1170
Joined: Sun May 16, 2010 7:28 pm

by kulivontot

Does somebody know of a US distributor?

egebhardt
Posts: 31
Joined: Wed Mar 19, 2008 8:38 pm

by egebhardt

Bump for this interesting 7970 rear der version!
Ebay doesn't have any 7970-A visible yet. Maybe they will come soon.
Eric in San Carlos, CA


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