Di2 7970 rear derailleur cage break, help what can I do?

Triathlon Forum
1

I bent my 1st generation Di2 7970 10 speed rear derailleur cage. My LBS said they cant get parts so I am over to ebay to stay on the road.

Looks like I can buy a replacement (used) derailleur (10/11 speed) as well as a K Force replacement cage (but not sure of the cost).

Can a 11 speed first gen rear derailleur work on my 10 speed cassette,chain and shifters?

Thanks for any ideas or advice on how to get back on the road without overhauling everything.

2

Shimano have a solution for you.
Your LBS should know about it.
There is an adaptor to allow you to run new 2 wire stuff with your old 4 wire stuff.

3

Thanks, this looks like it might also work: thoughts?

Digirit Road Bike Oversized Pulley System for Shimano Dura Ace/Ultegra 6800 Blk

https://www.ebay.com/itm/Digirit-Road-Bike-Oversized-Pulley-System-for-Shimano-Dura-Ace-Ultegra-6800-Blk/192418436358?hash=item2ccd085506:g:pggAAOSwN0NaTvub

4

I just replaced a bent cage on a 6770 deraillru and found out a bunch of newish Shimano derailleur cages are interchangable.

https://www.amazon.com/KCNC-Cyclocross-Bicycle-Oversized-Derailleur/dp/B074DF1TP4

I ended up just buying a mechanical GS derailleur and using that cage.

5

Sounds like an omen, time to upgrade the groupset??!!
The first gen DA Di2 is a PITA in that it was a one off essentially and nothing after that is compatible electronically with it. Did not think it would be too hard to replace a cage or find a second hand replacement for it. However, the cost to upgrade is not too bad all things considered, even if it is just to the first e-tube gen Di2 ultegra that came out.