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PostPosted: Sat May 31, 2014 3:03 am 
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Joined: Thu Mar 25, 2004 8:34 pm
Posts: 609
The new di2 for mtb has sequential shifting - does this mean it's coming for Road?

This could be just a firmware upgrade or use the MTB front junction box - they say it's pretty programmable? And MTB is available in 2x11

Maybe you just need that LCD display?


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PostPosted: Sat May 31, 2014 3:42 am 
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Joined: Wed Dec 12, 2012 9:35 pm
Posts: 8
The mtb/xtr di2 looks pretty wicked, I must agree. What I'd like to know is if the rear d will work with the di2/hydro road shifter. That would be awesome on a cx/gravel rig. Sequential shifting is a really great addition too. Particularly if it manages to happen as transparently as the road di2 shifts now. An electric clutch d on my cx bike is what I've been waiting for! Alas...its probably gonna cost A LOT.

Sent from my SGH-T999 using Tapatalk


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PostPosted: Sat May 31, 2014 3:47 am 
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Joined: Mon Jan 16, 2012 7:03 am
Posts: 202
Location: Queensland Australia
What is meant by Sequential? Because my road DI2 can change either single or multiple gears already.

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2013 Giant Defy Composite 2 M, 8.5kg - Wife's
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PostPosted: Sat May 31, 2014 3:52 am 
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Joined: Thu Mar 25, 2004 8:34 pm
Posts: 609
Sequential means that the brain will decide when to switch the front to get a sequential progression of gear ratios - just press the button to tell the system you want more or less gear and it will figure out the next best combination of front and back to give you that.


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PostPosted: Sat May 31, 2014 4:05 am 
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Joined: Mon Jan 16, 2012 7:03 am
Posts: 202
Location: Queensland Australia
Lol. Yep just had a quick read on Bike Rumour. Sounds cool.

_________________
2013 Giant TCR Advanced SL 0, 6.92kg
2013 Giant Defy Composite 2 M, 8.5kg - Wife's
Azzurro Torino 8.55g
Fuji 650 10.8kg
Miele Lupa Triple Tandem 38,89kg


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PostPosted: Sat May 31, 2014 4:35 am 
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Joined: Thu Mar 25, 2004 8:34 pm
Posts: 609
According to the press release this is all done in Software. What's to preclude someone from using the MTB firmware to run the Road system. Just update your front Junction box and away you go.


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PostPosted: Sat May 31, 2014 4:49 am 
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Joined: Thu Mar 25, 2004 8:34 pm
Posts: 609
The display unit functions as Junction A and has three ports - you should be able to plug this into the Road system and get sequential


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PostPosted: Sat May 31, 2014 6:06 am 
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Joined: Tue Aug 02, 2011 5:54 pm
Posts: 311
Could mean the end of shifting with your left hand/lever. Which would make the left brifter quite light.


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PostPosted: Sat May 31, 2014 10:36 am 
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Joined: Wed Dec 14, 2011 2:47 pm
Posts: 127
Location: Hong Kong
Shimano Di2 Sequential Transmission - Fairwheel Bikes (7970 in 2010)

https://www.youtube.com/watch?v=eq_BgmJ ... detailpage


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PostPosted: Sat May 31, 2014 10:47 am 
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Joined: Wed Dec 14, 2011 2:47 pm
Posts: 127
Location: Hong Kong
Per the display, some guys modified their Ui2 with Alfine Di2 Digital Gear Display SC-705

http://nk.hateblo.jp/entry/2013/02/01/162251

http://handsonbike.blogspot.hk/2013/04/ ... e-di2.html


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PostPosted: Sat May 31, 2014 4:07 pm 
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Joined: Fri Dec 06, 2013 9:08 am
Posts: 291
Location: Slovakia
Hmm, what if you want to shift the front derailleur and keep the rear where it is? I can't imagine pushing button 10 times from lowest gear to higher I need at that moment (those situations happen)


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PostPosted: Sat May 31, 2014 5:32 pm 
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Joined: Thu Mar 25, 2004 8:34 pm
Posts: 609
Read the Di2 MTB write-ups apparently you can override the Sequential Program on Demand


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PostPosted: Sat May 31, 2014 5:44 pm 
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Joined: Wed Dec 14, 2011 2:47 pm
Posts: 127
Location: Hong Kong
Should road system be designed like this?

(In XTR Di2)A front shifter is available, and the whole system can be set into “manual mode,” allowing it to function just like a normal drivetrain. But Synchronized Shift is designed to be used with just a single shifter. The system will decide when to shift the front derailleur, moving across the drivetrains’ entire range. The point at which it shifts the front derailleur will change depending on whether the system is being upshifted or downshifted, and can be manually set as well.

http://velonews.competitor.com/2014/05/ ... xtr_330061


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PostPosted: Sat May 31, 2014 7:57 pm 
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Joined: Tue Sep 13, 2011 9:45 pm
Posts: 82
http://youtu.be/lZGuwhSLcJU

Am I wrong but does the efficiency at 1:!0 in the video look wrong....should stay in the 26 for 8 cogs on the rear then switch to the front and drop down to the 6th and start again. Higher drivetrain efficiency and no bigger gap in the gear ratios eyeballing the chart

I want to play with this on my road bike and deco on my TT bike with only the single button extension shifters!

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PostPosted: Sun Jun 01, 2014 9:25 pm 
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Joined: Tue Sep 26, 2006 12:37 am
Posts: 5751
Location: Phoenix Arizona
Sequential KICKS ASS on the road...

Image


The bike here...
http://www.pezcyclingnews.com/page/tech-n-spec?id=100596

The video of function here...
https://www.youtube.com/watch?v=eq_BgmJ3a-o

This could be done to ANY electronic drive system with very little effort.

It's intuitive and functions flawless.

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charles@pezcyclingnews.com


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