Rotor 12 speed cassette with Ultegra Di2

[chrisbainbridge]

Has anybody tried Rotor 12 speed cassettes with Shimano Ultegra Di2?

The maximum Shimano cassette is 11-34 but Rotor make an 11 -39 which might just fit with a smaller set of chainrings and give me a really low gear for hills.

[Zed43]

i’m using the 105 Di2 with the Rotor 11-39 in my Snoek velomobile. It works, but a bit clunky.

[chrisbainbridge]

Zed43. Thank you. That was what I needed to know. Any tips?

[Zed43]

You'll need a special USB cable ("EW-EC300") to charge the Di2 when using the 105 derailleur. It is not included with said derailleur and costs € 40+

Use the b-screw to get the upper pulley wheel quite close to the 39t cog (vertically speaking), I think that the fact that I can't because of the restrictions in the velomobile adds to the clunkyness.

I'm using Rotor 30/46t oval chainrings. I like the 30/46t size but feel the oval-ness adds to the chance of dropping the chain when shifting from big to small chainring (again, having a chain that is 3x normal length with an additional idler does not help chain tension).

Shop around, I found a cheap address in France for the Rotor cassette, then used the "price guarantee" of bike24.com to get a good price to combine with the rest of the parts I needed.

[chrisbainbridge]

Thank you.