I am considering upgrading my Shiv Comp Rival to Di2. Is there a good
thread/walkthrough on how to do this, part list, etc?
I am not looking for the old ST standby of "learn how to use the search function"
I did this at the beginning of the year on my 2013 Shiv Comp Medium. I installed Ultegra 6770 10 speed parts (mostly). I had the LBS do the install. I did not replace the drive train, so I'm running only new derailleurs and shifters but stuck with the cassette, cranks and chain rings that the bike came with. Specialized sells a internal battery mount adapter that allows you to install the internal battery, which I like a lot. Apparently the Shiv Comp alloy aerobars do not have ports for the Di2 wires for the brake mounted shifters, so those wires were taped to the bottom of the base bar.
The added advantage of the internal battery charger is that it also doubles as a USB interface to your PC. So you can download the Shimano configuration software and change settings on the system / upgrade firmware without buying the dedicated USB interface. If you get the external battery, you either need to buy the extra interface or take it somewhere if you need to upgrade firmware / change settings. I found the combined cost of the internal battery and charger and Specialized seat post adapter to be comparable to the external battery, mount and charger, so I see it as getting the PC interface "for free". I guess the disadvantage of the internal battery is that you need to take the bike to a power receptacle to charge, as opposed to taking the (external) battery out and taking it to a charger. Since my bike never sleeps more than a few feet from a receptacle, it's a non-issue for me.
Below are the parts I ordered. I found the following site extremely useful: http://carltonbale.com/...ng-you-need-to-know/
SW-R671 Aerobar shifters
ST-6871 Reverse Brake lever shifters (if you want to shift from the base bar)
SM-EW90 5 port junction box if you're going with brake lever shifters, or 3 port if not
SM-JC41 internal junction 2
Front derailleur (I got braze on FD-6770)
Rear derailleur (I got RD-6770 - 10 speed)
SM-BTR2 Internal battery
SM-BCR2 Internal battery charger
Specialized Shiv seat post battery mount (~$30)
The following wires:
- Rear Derailleur To B Junction: 750mm
- Front Derailleur To B Junction: 300mm
- Internal Seatpost Battery To B Junction: 650mm
- B Junction To A Junction Downtube Cable: 950mm
I also downloaded a bunch of technical documents from Shimano's site that helped me understand everything.
So far I've been super happy with the change.