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Thread: SRAM E Tap

  1. #1
    pan y agua merlinextraligh's Avatar
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    SRAM E Tap

    SRAM comes out swinging with Red eTap - VeloNews.com

    For this to be a viable option for most tandem teams, the 28 tooth cog limit would have to be overcome.

    So, would a K Edge long cage modification work?
    You could fall off a cliff and die.
    You could get lost and die.
    You could hit a tree and die.
    OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.

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    The 28T limit should be easy to overcome.

    However, SRAM makes certain design choices that will make it less attractive than Shimano. It doesn't sound like eTap can shift both derailleurs with one paddle. Shimano's XTR Di2 has Synchro Shift that can control both derailleurs with one paddle to avoid cross-chain combos. This feature will likely migrate to the road Di2 in the near future. It makes more sense for eTap to offer synchro shifting with a over-ride for a front shift (by pressing both paddles).

    I also wonder if the longer distance on the tandem will reduce wireless reliability. We have never missed a shift on our Di2, but have encountered mis-communication between our Garmin 500 and the cadence sensor. The latter is a minor nuisance but missed downshifts can strand a team on a short, steep climb. For the vast majority of frames, a wired connection is straightforward and more reliable.

  3. #3
    Disco Infiltrator Darth Lefty's Avatar
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    I haven't looked at the group but you might get some just from b-tension.

    If this won't do it you can probably find some other way to do it. This product is meant for 1x road setups. They have a similar one for MTB direct mount
    RoadLink ? wolftoothcomponents.com

    I have not followed electronic shifting, I'm just not that interested, but it seems like none of them have "shift logic" as easy as it obviously could be. I'd like it to function like XTR in controlling both ends from one shifter, but also have a rocker switch on both brifters that does the same thing, and have it accessible from either drops or hoods. Maybe it would look like the button on Ergos, or better yet the funny version of same on Microshift.
    Last edited by Darth Lefty; 08-26-15 at 09:20 AM.
    Genesis 49:17

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    Would be nice to see someone pick up a triple chainring electronic group since it would be so useful for tandems/ adventure bikes.

  5. #5
    Member Alcanbrad's Avatar
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    By going with a proprietary wireless protocol, they missed the boat on opening the doors for a cell phone app that could offer such features as reporting battery level, tuning desired shift speed, and ultimately, something akin to an automatic transmission that would shift for you depending on speed, power, grade, etc. Heck, you could even offer voice controlled shifting or audible announcement of your current gear setting.

    All that said, I am like Darth Lefty, I don't really much care for e-shifting. More complexity results in lower reliability, and greater difficulty to effect road side repairs.

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    A few relevant tidbits that I've picked up through the various articles today:

    - Shifters will activate a derailleur from 100 yards. I think that'll be enough for any tandem.
    - The 28t limit is only for the initial release. WiFli models, hydraulic brakes, and possibly MTB will follow.
    - The rear derailleur has an ANT+ output that provides gear selection and was demonstrated on a Garmin Edge 520.
    - With some creative routing of a Blip button, say from the left shifter to near the right shifter, it should be possible to activate shifts in either direction with one hand or to activate a front shift.
    - I give it two weeks before someone has figured out how to tweak the firmware and adjust the rear derailleur shift speed.

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    Quote Originally Posted by Darth Lefty View Post
    This product is meant for 1x road setups. They have a similar one for MTB direct mount
    RoadLink ? wolftoothcomponents.com
    The eTap has an electronic front derailleur so it's a 2x11 road system. I suppose you can go 1x11 if you don't install the front derailleur.

    shlammed: I doubt that we will ever see a triple electronic because there's limited appeal. Most tandem teams are happy with 2x11 Di2. Even for riders who need really low gearing, the XTR Di2 has limited appeal because 1x11 drivetrains (eg. SRAM XX1) are so precise and reliable.

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