Anyone using a SRAM 11-36T cassette with a Di2 setup?
 

I am thinking of trying this, based on some reports that it could work with the B-screw cranked down.

I have a Di2 Ultegra 11-speed system with the longer cage and am currently running a 11-32T cassette.

Is anyone doing this successfully here? Any suggestions to keep it working smooth? Would it work with a Shimano 11-speed chain, or would I need to use an SRAM 11-speed chain?

You should check here :P

http://www.bikeforums.net/general-cy...vs-triple.html

No mention of it there, but I really appreciate your help. Thanks.

@TimothyH

Are you doing this? What chain do you use?

I am running exactly what is described.

• SRAM PG-1170 (Force) 11-36 cassette
• Shimano Ultegra 6870 Di2 GS mid-cage derailleur
• Shimano Ultegra 50/34 compact road cranks
• Shimano Ultegra chain.

Bike is a Niner RLT 9 RDO. It shifts fine. I cross chain the crud out of it, shift under load, basically beat the heck out of it. No problem whatsoever.

The B screw had to be turned in (clockwise) quite a bit but the pulley clears clears large sprocket fine. I don't like the angle of the B screw against the derailleur hanger but this might be an issue specific to the shape of the hanger which comes with the Niner. If it becomes a problem then I'll get some kind of derailleur hanger extender, Wolf Tooth or similar. This is a picture of the screw before it was cranked in clockwise. The angle is much more acute now.

https://www.dropbox.com/s/mqlqpw32u8...05.sm.jpg?dl=1

Four links were removed from the stock Ultegra chain and a KMC Missing Link was added. The KMC part number for 11 speed is CL-555.

This is how it looks crosschained small front (34) and small rear (11)...

https://www.dropbox.com/s/v1yvyzfeds...02.sm.jpg?dl=1

This is how it looks crosschained big front (50) and big rear (36)...

https://www.dropbox.com/s/4nf76ui9gm...01.sm.jpg?dl=1

If the sprocket were any larger than 36 it would definitely need derailleur hanger extender. I was prepared to need a Wolf Tooth RoadLink extender but did not need to do so. If the B screw becomes an issue in the future then I won't hesitate.


-Tim-

I've seen tandems set up with Di2 using this:

https://www.wolftoothcomponents.com/products/roadlink

Thanks very much for the detailed post. I really appreciate it (and am about to try to replicate it).

If for some reason the B-screw trick isn't enough, I will definitely go for that. Thanks!

OK, looks like it works, at least on the stand. If the weather is decent tomorrow, I will test it in the field. Briefly, I have the 11-36T cassette set up with a new Shimano chain (which I waxed) and my 46/30T crankset. That gives me a 22.6 "gear inch" low (as opposed to a 29" low gear I started with when I had a 50/34 vs. 11-32), and I can safely cross-chain (not that I plan to) with two links removed from the new chain. The shifting seems rougher, but that could be the hot paraffin lube I decided to try...

It's been a year. How is it working? Getting ready to go Di2 on my bikes.

It works fine. I also use Shimano's 11-34T eleven-speed cassette on another wheel-set. Both work without issue. I don't know why I wrote that the shifting seems rougher. It is fine.