Oops, were we supposed to see that?

[Bruce K]

For those watching carefully, I think we just got a first look at a Dura Ace Di2 Shadow plus rear derailleur.

Scott bike - close-up shot. Couldn't see a cable anywhere.

BK

[Spaghetti Legs]

Are you referring to yesterday's Tour stage? I saw a funky looking RD on a quick pan shot of one of the breakaway riders. I wondered what it was - it had huge pulleys, but I'm not really up to speed on all the electronic stuff.

[Bruce K]

Nope - today’s Stage on the Scott bike.

BK

[cribbit]

Photos/clip?

[metalheart]

What is the difference between a "Shadow" and other Shimano derailleur?

[Bruce K]

Wireless?

BK

[stev0]

My understanding was that shadow derailleurs were more tucked/low profile than your average RD, and that "shadow plus" means low profile + clutch.



So Di2 Shadow Plus = wireless, low profile, clutch RD

[weiwentg]

Originally Posted by stev0

...

So Di2 Shadow Plus = wireless, low profile, clutch RD

So, basically the OP believes he saw a Dura Ace RX Di2 derailer. We already know the Ultegra RX Di2 derailer exists, but he suspects a DA version is coming.

[stev0]

precisely. wasn't watching closely, but would have expected it to surface on the cobbles if anywhere.

[Mark McM]

Originally Posted by stev0

My understanding was that shadow derailleurs were more tucked/low profile than your average RD, and that "shadow plus" means low profile + clutch.



So Di2 Shadow Plus = wireless, low profile, clutch RD

I don't see the advantage of a low profile derailleur on a road bike. On an MTB, sure, it's less likely to get snagged by something on the trail, but on a road bike?

On the other hand, I do see a few other features of these derailleurs that are independent of the low profile design: Specifically, they have their B pivot offset to the rear, and they have a clutch mechanism, both of which improve performance with wide range cassettes.

[Bruce K]

It was clearly labeled Dura Ace and had no visible wires or cables.

Mechanic sitting next to me said shadow.

BK

[.RJ]

Wireless?

[Bruce K]

Appeared to be...

BK

[madsciencenow]

[QUOTE=Mark McM;2397209]I don't see the advantage of a low profile derailleur on a road bike. On an MTB, sure, it's less likely to get snagged by something on the trail, but on a road bike?

It will save you 0.0001 watts ... ...which is a 30% improvement over non-shadow rear derailleurs

[oldpotatoe]

Originally Posted by .RJ

Wireless?

Wonder if anybody spotted any Campag 12 wireless? There won’t be a 12s EPS(wired)...