can someone tell me what i need to buy if i get the upgrade kit?
will a zipp vumachronos crankset fit with di2? what size? 170?
all these numbers and parts are driving me insane.
thx for your help.
Ok from my experience - I have nothing to do with shimano or the bicycle industry.
ST 7971 - Brake levers with gear change buttons.
SW 7971 - change levers for extensions
SM-EW 79A-1 - Cable connection for above, without flightdeck.
SM-EW 79F-1 - Cable connection for above, WITH flightdeck.
FD 7970 - Front derailleur
RD 7970 - Rear derailleur
Cable for - Bottom bracket/front - rear derailleur/battery.
This is the fun part. Models are numerous with different “Junction B” configurations and cable lengths.
EW7970S - External wiring for small frame - 770mm
EW7970M - External wiring for Medium Frame - 790mm
EW7970L - External wiring for large Frame - 875mm
The above comes as a complete unit with all cables connected and are fixed outside the frame.
EW 7973 – Internal - external.
Internal for frame, exiting at Bottom Bracket for Junction box connections. Wires are fed through frame, exit at bottom bracket connected, heat shrink applied and then returned inside the frame.
After connecting “Junction B” sits below bottom bracket fixed in place of your current derailleur cable guide.
We used a small drill as a guide hole then drilled to correct size to take connector. Shimano grommet makes a tight fit.
EW7975 - Internal wiring, all parts can be placed inside frame once connections made. - Frame construction dependant. i.e will the “Junction B” fit inside the frame hole? Link to cervelo images.
Instead of the “sander” we used a small dremmel “file” to remove excess/widen the frame holes to take the connectors.
Model, Downtube, BB-FD, Chainstay, Battery Mount – BB, Battery mount itself(BM).
EW 7975, 960mm , 275mm, 720mm , 630mm, BM Long.
EW 7975 – 2, 960mm , 275mm , 795mm , 630mm, BM Long.
EW 7975-A-1*, 960mm , 275mm , 720mm , 400mm, BM Short.
EW 7975-A-2*, 960mm, 275mm , 720mm , 1010mm, BM Short.
NOTE it is apparent that not all countries/distributors carry or have knowledge of all parts and options. They also substitute their own codes and use variations of the Shimano codes.
This information I have gathered while trying to build Di2 into our bikes - you will need to check suitability for yourself.
Shimano internal - internal
Shimano internal - external
useful link
http://techdocs.shimano.com/techdocs/index.jsp
go here and in find type Di2
sorry, but that just left me even more confused.
(scratches head)
OK, and I also don’t work for Shimano, but here is an attempt at clarification
You need:
One of ST 7971 - Brake levers with gear change buttons.
One of SW 7971 - change levers for extensions
One of FD 7970 - Front derailleur
One of RD 7970 - Rear derailleur
One of SM-EW 79A-1 - Cable connection for above, without flightdeck (OR ONLY IF YOU ARE USING THE FLIGHTDECK COMPUTER, INSTEAD GET ONE OF SM-EW 79F-1)
Then you need a cable set depending on whether you are externally wiring or internally wiring.
If you are externally wiring you need depending on the size of your frame EITHER
EW7970S - External wiring for small frame - 770mm OR
EW7970M - External wiring for Medium Frame - 790mm OR
EW7970L - External wiring for large Frame - 875mm
If you are internally wiring you need EITHER
EW 7973 – Internal - external. This is if you have the junction box below the bottom bracket.
OR
EW7975 - This is ONLY for full internal wiring if the “Junction B” part will fit fully inside the frame
You also need the battery parts which were not mentioned before.
OK, both the above posts are wrong because you don’t NEED brake levers with gear change buttons. That’s optional.
You need both derailleurs.
You need the shifters to go on the ends of the extensions.
You need the correct front wiring harness for the aero shifters (it’s different from the wiring harness for the road shifters and I believe it comes in varying lengths).
You need the rear wiring kit that connects the battery and the derailleurs, etc.
You need the battery/battery bracket.
You need the battery charger and power cord.
The Zipp VumaChrono will work fine. The size of the crank is irrelevant.
sorry, but that just left me even more confused.
(scratches head)
It’s not easy understanding the options behind Di2 - particularly for TT bikes. But what has been posted here is basically correct - depending on your preferences. The key issue you have to be really comfortable understanding is that there are multiple “wire” or “harness” options because of the variety of bike frames and frame preferences of Di2 users. For TT frame users, I would ask myself two questions:
-
Do I only want the Di2 shifters (SW-7971) on the aerobar extensions and just keep the brake levers - just brake levers OR do I also want to be able to shift from my brake levers (ST-7971)? Depending on your decision on this one there are appropriate wiring harness as well. Note that some users actually only want to shift from the aerobars. -
Do I want my wiring harness inside my frame or not? If your TT frame does not have features that can route the Di2 harnesses inside a frame then you have no choice but to use external harnesses (which come in three lengths – S, M or L). If your TT frame allows you to use internal harnesses, then you have a variety of choices and options – which are all discussed above.
Hope this helps.
I am yet to pull the trigger on di2 but everything i have read says the brake shifters are REQUIRED and the bar end shifters are optional.
Obviously the opposite would make more sense, but i dont think you can run the bar end shifters alone
Thanks everyone for the good advice. Still kinda murky, but better…
All I know that after slapping Di2 on my S3, I will never go back to SRAM Red or any other manual type components. It’s like a Neanderthal taking a time capsual into the future!
I am yet to pull the trigger on di2 but everything i have read says the brake shifters are REQUIRED and the bar end shifters are optional.
Obviously the opposite would make more sense, but i dont think you can run the bar end shifters alone
Where have you “read” this. Check out page 65 of the “Official Speed Concept Owners Thread.”
http://forum.slowtwitch.com/gforum.cgi?post=3191021;search_string=di2;#3191021
I asked this question to Carl Matson of Trek and he said it works fine. He uses a Di2.
I have “read” it (and thanks for the sarcasm) several places including here
Where it seems to be fairly definitive in the statement “These switches must be run with either Shimano’s Di2 Dual Control road or Dual Control trial levers. They cannot be run on their own.”
I’m not saying that’s correct, but it is what i am seeing. However, if you look at the techdoc Here
It doesnt appear to say that the brifters are required, only “to realize best Performance”. But it gives no guidance on how wiring should look without the tt brifters.
Fair enough. My stuff is on order and I will try it out myself and post it here. Intuitively it shouldn’t be a problem running the Aero TT shifters alone because they are just switches.
Yeah, can’t see why it wouldn’t work unless the brifters have some smarts in them. Which i don’t think is the case.
Presumably Shimano and some retailers claiming you MUST buy the brifters is just to line thier wallets. Though personally I would but i like the idea of the option to shift on the base bar
I am yet to pull the trigger on di2 but everything i have read says the brake shifters are REQUIRED and the bar end shifters are optional.
You are mistaken.
I have put several of my bikes together with just the bar-end shifters.
.
Correct me if I am wrong but last time I checked Di2 Flight Deck was cancelled by Shimano a while back if that simplifies the wiring harness decision a tad. Also I can confirm you don’t NEED the Di2 brake shifters for it to function, was using just bar end shifters for a while before I installed the Di2 brake levers. Also what is not mentioned is that certain bikes will come with specific Di2 Battery mounts like the SC (Bottom bracket cover) which might have to be a separate order.
Hadn’t heard that.
All the front wiring will be redundant when they move to ant+ anyway…
If you’re referring to Di2 Flight Deck its pretty hard to find any info now since the cancellation was back in 2009.
http://cycleloft.blogspot.com/2009/11/new-flight-deck-officially-cancelled.html
http://weightweenies.starbike.com/forum/viewtopic.php?f=3&t=65058&start=0
Terribly disappointed when I read the info since I was looking forward to upgrading the FD on my current bikes to an ANT+ unit, just had to settle for a 310XT.
Cheers
Hi,
I was reading the thread. Does anyone tried to route the DI2 internally even if his bike wasn’t made for that ?
I would like to adapt my frame cautiously.
Also, did anyone try to adapt the wire to put the battery under the saddle ? (i don’t know if shimano sells an extra cable to route it up to the saddle)
Last question : someone tried to cut the wires to make them fit in the frame (internal) and then put the cable back ?
Thanks
Does anybody know the answer to this question:
What if one wanted to only use di2 TT style brake/shifters on the sides of the base bar - without the bar end shifters on the extensions
(Think of a bike with bull horns and a minimalist brake/shifter set-up…)
Would the di2 TT wiring be able to work with that set-up? - or are bar ends a necessity to get Di2 to work?
Ar you still looking doe someone to do the install on you frame?
Did you ever get a response on using just brake lever shifters and no bar end shifters?