Everything that uses E-tube wiring, which is everything except old DA 7970, is compatible with each other. At the moment, that means you could use alfine Di2 shifters with ultegra RD and a DA FD. It's all plug and play. You can adjust the shifter controls (what button does what, how fast the bike will change gears if you hold down the button, etc.) in a computer program.
The Dura-Ace and Ultegra front derailleurs are optimized for 11 and 10 speeds, respectively, but I'd imagine there'd be very little funcional difference if used an Ultegra FD on an otherwise 9070 bike.
The rear derailleurs, at least as far as I've seen on the internet and from Shimano, are specific to the number of speeds they were designed for. So, if you want 11 speed but only want to pay for ultegra di2, don't expect the motor in the RD to work with the spacing of the cassette. That said, you could just put a DA RD on an otherwise ultegra bike and it would work just fine. I don't know if the motor in the DA RD will work with 10 speed or not. Maybe someone else can chime in.
No experience but having read a lot of the Di2 topics, my understanding is that with e-tube compatible Di2 components, although rear shifting signals are based on how the firmware for the DA 9070 junction box ('the brain') is programmed, the rear derailleur still determines the number of cogs. For firmware updates, you can use Shimano's internal battery charger (BCR2) or the Shimano PC Connector Interface Device (SM-PCE1PC) as the only thing the BCR2 does not do that the PCE1 does is diagnostics for when you have a malfunction as the PCE1 will test stuff out as wellas provide step-by-step instructions on narrowing down the problem. The PCE1 is offered as an aftermarket accessory but is currently limited in availability but with the ability to update firmware, seems to me if you had Ultegra Di2, all you would have to do is swap out the junction box and rear derailleur then update firmware so that all the electronics are on the new version to make current Ultegra Di2, 11 speed compatible.eordman wrote:I don't know if the motor in the DA RD will work with 10 speed or not. Maybe someone else can chime in.
I am more than happy with the performance of the Ultegra Di2. I understand I will need to upgrade the cassette to 11 speed for this to work. Does anyone know if the Di2 will need adjusting or will it automatically work with the 11 speed cassette?
Any advice/help is much appreciated.
The crank will be a huge upgrade. Much stiffer, lighter, smoother shifting, etc. The biggest advantage I see in the new 4-arm shimano cranks is the ability to switch between "compact" and "standard" ring combos on the same arms (you will only need new rings, not a whole new crank).
Here's a whole PDF manual on the firmware upgrade process(available on the Shimano website). Hope I do not get flamed for posting an exterior link
http://techdocs.shimano.com/media/techd ... 771121.pdf
For top end speed, you should not need a 54 tooth. Gearing choices come down to the type of terrain you ride. I ride in flat south Florida on a 53-39 crank and 11-23 cassette and have hit 40mph in the 53x12 with around a 110 to 120 cadence. What cassette are you running?
40mph on the flat?? That is impressive!
For you I would suggest a 52-36 or 52-38. With an 11-28 cassette you can still max out at 37mph with a 100 cadence. Not knowing your riding abilities that should be sufficient as you could probably sprint at 120 cadence which would be 40+ mph.
Use a gear calculator to get good estimates of speed vs. cadence vs. gear ratio. I like the Sheldon Brown one here.
Thanks for your advice, I have a bit more direction now.
Good luck with your new stead
- Similar Topics
- Last post
- 12 Replies
- 471 Views
Last post by CrankAddictsRich
Tue Apr 03, 2018 12:20 pm
- 13 Replies
- 1236 Views
Last post by goodboyr
Fri Aug 25, 2017 2:31 pm
- 21 Replies
- 3122 Views
Last post by alcatraz
Wed Feb 28, 2018 1:39 pm
- 6 Replies
- 446 Views
Last post by TonyM
Tue May 15, 2018 11:57 pm
- 476 Replies
- 30599 Views
Last post by mag
Sun May 27, 2018 9:49 pm