Ultegra Di2...
 

So...it shifts, electronically....you get rid of all the cables, etc.. Shifting is spot on and quick, yada, yada, yada...but...

Programming...for instance...can it be programmed so that when you switch from the small ring to the big ring it drops 2-3 cogs in the back, and vice versa?

I know about multishift and assigning what paddles do what, but I was wondering if it can be programmed so that front and rear shift in coordination when making big ring changes...

I searched the forum already and I may have missed if this was covered already.

Thanks!

Hacking probably required. What you're asking for is akin to what Fairwheel bikes did a few years ago with sequential shifting on a DI2-equipped MTB. I know Shimano have opened it up a little bit as far as programability, but not to the level they were able to achieve with a custom 'Brain'.

http://fairwheelbikes.com/c/forums/t...-project-29er/

Thanks Tom

Have you ever played video games...tap the buttons 3 times and you jump 3 cogs. I can jump cogs on my di2 as fast as I can on my non di2 bike.

Up-up-down-down-left-right-left-right-B-A-Start.

That's kinda the point.

Nintendo? :roflmao2:

It's the Contra Code! Also used be tech nerds everywhere to unlock secret features. :roflmao2:

I was going to do Ultegra Di2 this year until I saw the Ultegra 6800. Seems to me the difference is getting smaller. So, I'm ordering a frame instead and waiting a year or 18 months to see what Di2 looks like then.

J.

That doesn't take much talent because cogs are small. Now if you can jump a fence that fast, I would say you are on to something. ;)

Shhh...this gives a 400W power up bonus.

That is going to not be useful all the time. You crest a hill, start accelerating down the back side, and shift into the big ring. Your rear mech then shifts up three cogs automatically. Dumb.

I had thought about that... It can be easily solved with an alternate switch. A bypass.

You got close.
Up, up, down, down, left, right, left, right, b, a, b, a, select, start

You can already use the e-tube software to change the function of the four buttons in a pair of shifters. Just a matter of a company deciding they want the functionality and writing the code. You could use the climbing shifters near the stem, or use one of the brake lever buttons for the big ring (as mentioned earlier, one button could handle that since it's a two position deal) and use the remaining button to match the rear gearing depending on if you just shifted to or from one of the front rings.

6870 Di2 has multishift turned on out of the box. You don't even have to tap; just hold the button down.

Well then...I should probably update the firmware on my 6770 sometime. I don't mind tapping the buttons tho.

I lucked out because my nearest LBS (still a loooooong ways away) won't do firmware updates. If it wasn't turned on when I got it I'd have to buy the PCE1.

Depending on what goes on with updates in the future I might still have to.

A guy I ride with on occasion keeps telling me that he can hack it so I can run 11 speed too. I just keep telling him if/when I change my wheelset. He seems very deadset on doing it though.

Not exactly, in my opinion. A true sequential will just go to the next highest or lowest gear, regardless of the derailleur combo needed to get there. Combine that with the existing di2 programability, and a hit and hold on the button can take you up or down a predetermined number of steps.

Currently, the way I run di2 my front and rear derailleur switches are set up so that I can hit both at the same time, with the one hand I have available to me. 9 out of 10 times, when I change the front ring, I couple it with a hold on the rear button that moves me three cogs. 1 out of 10 times, I just shift the front and take the 16 tooth jump, and then fiddle with the rear.

In order of preference, I would love to see a true sequential. Second is the automatic movement of the back to lessen the blow of a ring change. Third is what we've got now, which is still pretty darn cool for an adaptive rider.

It shouldn't be that big of a deal you'd think. Presets would be nice as well... More advanced would be things like shifting as per torque/cadence...true automatic

I agree that the algorithm is pretty doable, but the new di2, as opposed to the 7970 that Fairwheel used, is less susceptible to hacking. Re the full automatic, I dunno. Still like to drive.

I rode a friend's bike with Di2, she had it set up to dump/jump three cogs when the RD shifter was held, which was a pretty close match for the difference in her compact chainrings. And as cool as that was, it was really nothing compared to how effortlessly it shifted to the big chainring under a full load. I knew right then my next bike would either have Di2 or at least be Di2-ready (internal cable routing, etc.)