Di2

[grumpyoldgit]

These are the ramblings of a madman,I profess to know the squre root of sod all about electronic shifting......
Seems all very nice,but why dont they go the extra mile & computerise it.
A bike running a fairly standard double chainring & 10 speed rear has about 15 useable gears,so why not make one button operate both front & rear shifters,this would give almost 'seamless' shifting,with overide function if required?It would take a computer the size of a pea.
Or ,call me a grumpy old cynic,is this the next marketing ploy

 

[moxey]

Get yourself designing it, you could call it Git2

 

[fossyant]

You have gear overlaps as well and there may be a reason you want to be on one chain ring or another !!! It can and has been done though - some folks tinker with DI2 !

 

[mark st1]

Im pretty sure this dude has some uber knowledge of the Di2 system makes some very good reading

http://www.cyclechat.net/threads/shimano-di-do-and-do-not.112006/

 

[Mr Haematocrit]

you can reprogram the shifters on Ui2 to do what you want.
I like the manual interaction of choosing my gear personally as I somedays I feel like spinning the gears and other days I like running of the big ring gear making it computerised takes away from this choice and would add additional weight and possibly effect battery life further.
There is a guy in the US who is playing with affecting shifting with a power meter output, not sure what hes trying to achieve though at this moment.
I don't think we have seen what electronic shifting will evolve into yet, don't think anyone really knows everyones still playing.

 

[grumpyoldgit]

So it is possible to change both front & rear with the push of one button?

 

[sidevalve]

While we're at it why not try adding some form of power source to ease up on all that tricky pedaling too.

 

[grumpyoldgit]

While we're at it why not try adding some form of power source to ease up on all that tricky pedaling too.

I was only asking a question,sorry if that offended you.

 

[Proto]

you can reprogram the shifters on Ui2 to do what you want.

Why can't Di2 be re-programmed to work with Campagnolo wheels/cassettes? Likewise, when the new 11sp Dura Ace come out later this year, can the old ten speed be re-programmed to eleven? Pretty certain that it can't, but why not?

 

[grumpyoldgit]

Now let me think,could it be because they want to sell you a new one(identical except for programming)?Surely not.

 

[Mr Haematocrit]

Why can't Di2 be re-programmed to work with Campagnolo wheels/cassettes? Likewise, when the new 11sp Dura Ace come out later this year, can the old ten speed be re-programmed to eleven? Pretty certain that it can't, but why not?

With 10 speed Dura-Ace Di2 you can hack about to achieve most things as its simpler but you can't physically reprogram it, with Ui2 you can change what each shift button does its response time, you can do this with 11 Speed Dura-Ace as well which is more closely related to Ui2 than the original Dura-Ace Di2.
You have a number of challenges when upgrading a 10 speed to 11speed cassette. The 11 speed cassette for a start is wider, Shimano’s solution was to design a new cassette body that is 1.8mm longer than that used with the ten speed system. This means a 10-speed rear wheel will not work with an 11-speed cassette, that is unless you have a Mavic rear wheel. Mavic has been using a cassette body that is 1.8mm longer than the standard 10-speed width, requiring a spacer to be used behind a 10-speed cassette. Without the spacer, the wheel will work with an 11-speed cassette. The cog width stays the same as the 10-speed version, but the spacing between each cog narrows slightly, requiring the chains side plates to reduce in thickness.

I think some hack will become available to permit the use of an 11 speed cassette on Dura-Ace 10 speed Di2 but im not aware of one which is functioning at this time

 

[PaulSecteur]

I think they missed a trick with electronic shifting. It couldnt have been too hard to make it communicate with a garmin to record what chainring and gear you are in.

Probably not that usefull, but it could have made another graph in garmin connect.

 

[Rob3rt]

I think they missed a trick with electronic shifting. It couldnt have been too hard to make it communicate with a garmin to record what chainring and gear you are in.

Probably not that usefull, but it could have made another graph in garmin connect.

If the Garmin firmware/software doesn't support it then why would Shimano bother to implement it. It would be a pointless engineering exercise. "Let's engineer a solution to send out a data stream containing this information that no-one will ever see".

 

[PaulSecteur]

Well, garmins do pick up other wireless signals from HRM, cadence and pwertap sensors, so I didnt think think it too out of the realms of possibility to pick up some gear info... if it was sent out.

 

[Rob3rt]

Well, garmins do pick up other wireless signals from HRM, cadence and pwertap sensors, so I didnt think think it too out of the realms of possibility to pick up some gear info... if it was sent out.

Yes the Garmin has the capability to pick up wireless data, but without the firmware to pick out certain information and store and/or display it it is useless bothering to throw that data at it. The Garmin uses Ant+ wireless, the Garmin software knows what data is contained in the data stream and picks out and displays the relevant information. If you don't explicitly programme the Garmin to find the ratio data and display it, it will just be useless data floating about in the air.

I.e. To make it worthwhile for Shimano to bother, they would need to have Garmin (and/or similar brands) commit to implementing the ability to decode and display said information and issue it as a firmware update. If there is little to no demand, then Garmin will be reluctant to bother.