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Upgrading 105 shifters on 2008 Roubaix - 11-speed? Di2? What'd you do?

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Upgrading 105 shifters on 2008 Roubaix - 11-speed? Di2? What'd you do?

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Old 08-23-15, 12:21 PM
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hobkirk
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Upgrading 105 shifters on 2008 Roubaix - 11-speed? Di2? What'd you do?

Time marches on! Ten-speeds are yesteryear, Di2 is becoming almost routine. A simple upgrade isn't so simple. But YOU GUYS know what works and have excellent practical advice.

Current setup on my 2008 CF Roubaix:
  • original shifters, 105 with about 10K miles (I shift a lot)
  • upgraded: 11-34 XT 10-speed cassette, Ultegra 53/43/30 triple, RD is XT MT 771 [needed for 11-34], Ultegra chain/BB/brakes, 2013 (?) DT4 takeoff wheels from a $5K Roubaix
    • I use all 3 chainrings, but 80% of my riding is in the middle ring
    • But I recognize I might need to consider changing to a double

Questions:
  1. Is the spacing on Shimano road doubles the same as triples? I.e., could I continue to use my almost new crankset with a double shifter?
  2. Ditto on the RD - could I use 11-speed shifters with my 10-speed cassettes until I wear them out? I am assuming when I shift to the final position the RD would bind and prevent further movement.
  3. If I change to an 11-speed cassette, will I need to change the hub?
  4. Will the new Ultegra shifters (Di2 or mechanical) work fine with my 6700 brakes?
  5. And finally, if you were upgrading:
    • Would you buy 11-speed sifters?
    • Would you spend extra for electronic? My LBS tech said he'd never go back (I rode his bike a few miles: I was impressed, but not dazzled)


Or just get a new bike if I decide Di2?
  • I have not done a full price investigation, but I am asking these questions because I noted that Di2 shifters are cheaper

Thanks, as always.
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Old 08-23-15, 01:47 PM
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My friends at the LBS are happy to sell you anything you feel important to buy..

I personally like my Rohloff*, disc brake, Bike Friday ,


to each their own, you have a race bike tifosi self image it seems.

want to experience what a bike ridden by the pros feels like , they have done the other part of their Jobs,

product promotion .

Drop by your own favorite shop and see what they offer .

* designed so well in the first place it does not need annual "improvements"..

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Old 08-23-15, 02:20 PM
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Minor point but your Ultegra triple crank is more likely to be 52/42/30 if an older model (FC-6503) or 52/39/30 if newer (FC-6603 or 6703). Unfortunately there are no 11-speed series triple road cranks.

To address your questions:

1. Yes, you could just remove the granny ring and it will work with a double shifter. You will, of course, have to reset the low limit screw.

2. No. 11-speed shifters and matching rear derailleurs have a different cable pull requirement than 10-speed and earlier ones. They are not backward compatible.

3. Probably yes. Shimano 11-speed freehub bodies are slightly longer than their 8/9/10-speed bodies. An 11-speed cassette will not fit on an 8/9/10-speed body. An 11-speed body will accept 10-speed and lower cassettes with a suitable spacer. You may be able to just change the freehub body and redish the wheel but an entire new wheel maybe easier.

4. I believe they will. Shimano lengthened the cable pull requirements for their more recent road brakes but I don't know if they did it for the 6700 or not until 6800 series. Older brakes will work with the newer shifters but the lever effort will be higher to get the same braking effect. Those who have tried it say the effort is acceptable.

5. Speaking for myself, no to both questions. I would not pay to "upgrade" an existing fully functional 10-speed bike to 11-speed or to electronic shifting. Only if I were faced with buying a brand new bike, then perhaps I'd do both.
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Old 08-23-15, 02:39 PM
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1. Yes, you can use a double shifter and just block out the granny gear with the limit screw.

2. The only way this will work is with di2. (i think) the new 11 speed di2 can be reprogrammed to work with 10 speed. The mechanical shifters and cassettes won't play together between 10 and 11 though. Also, your largest cog may be a issue, you have to check rear derailleur specs. By the way, your 10 sp RD *will* work with a 11 shifter though, as long as you have the right cassette.

3.possibly. 11 speed requires a wider freehub but manufacturers have been preparing for 11 speed for a while now. Most everything in the last 3-4 years is 11 compatible and using a spacer for 10 speed cassettes. If there's a spacer under your cassette, your hub should work.

4. Yes

5. I'd grab 10 speed dura ace or red stuff on eBay. You can get a top of the line group for 1/2 the price now that everyone is going 11 or di2
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Old 08-23-15, 05:59 PM
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4. I believe they will. Shimano lengthened the cable pull requirements for their more recent road brakes but I don't know if they did it for the 6700 or not until 6800 series. Older brakes will work with the newer shifters but the lever effort will be higher to get the same braking effect. Those who have tried it say the effort is acceptable.
6700 had the change already. Basically, if it has under the tape cable routing, it's the new pull ratio. Completely agree that backwards compatibility to older calipers works fine in practice even if shimano doesn't say it will.
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