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  1. #1
    Senior Member afilado's Avatar
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    STI Shifters - Triple to Double?

    I've accumulated several sets of Shimano STI "brifters". All are 3x8 or 3x9. Can the fronts be used in 2x set ups. Or the rear x8 in x7 set ups? The x9 as x8?

    Is it a simple matter of the derailleur limit screws - front or rear - preventing the final detent from engaging or is it a more complicated issue?

    Thanks,

    J

  2. #2
    Fuji Fan beech333's Avatar
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    I'm pretty sure that:

    triple -> double = works, you just don't use the last "click".
    8 -> 7 = does not (hence the demand for RSX 7 speed shifters)
    9 -> 8 = works with a little effort, but not the best (I believe there are many threads about this within the mechanics forum)
    Last edited by beech333; 01-20-11 at 12:39 PM.
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  3. #3
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    triple shifters work for double cranks. You can set the limits so there is just 1 click between them or you can do 2 clicks to shift between the rings if the shifters can't trim.

  4. #4
    Senior Member DVC45's Avatar
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    Quote Originally Posted by tomio View Post
    triple shifters work for double cranks. You can set the limits so there is just 1 click between them or you can do 2 clicks to shift between the rings if the shifters can't trim.
    I've read it here, that doing so can damage the shifter. Or is it limited to Shimano 105's only?


    Here's the thread where it's mentioned.

    http://www.bikeforums.net/showthread...ing?highlight=
    Last edited by DVC45; 01-20-11 at 01:01 PM.
    "Cycling is for pleasure not penance"

  5. #5
    Senior Member afilado's Avatar
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    Interesting. However, I just remembered that all these (except one) came off bicycles which I believe were set up as double fronts.

    Still looking for feedback from experienced users.

    J

    Quote Originally Posted by DVC45 View Post
    I've read it here, that doing so can damage the shifter. Or is it limited to Shimano 105's only?


    Here's the thread where it's mentioned.

    http://www.bikeforums.net/showthread...ing?highlight=

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    I've done it. I had it on a couple bikes of mine and on my girlfriend's. Just slack the cable a bit so it doesn't lock up. The problem is putting too much tension in the shift system when you move to the big ring since the double derailleur doesn't want to move as much as the shifter is pulling. You may have to have slack in the line before upshifting once.
    Last edited by tomio; 01-20-11 at 01:48 PM.

  7. #7
    Senior Member RobbieTunes's Avatar
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    I've done a bunch of the upgrades, and some mixing and matching.
    We're talking Shimano here, and I'm leaving Dura Ace out of it.
    Except for 7/8 speed combo's, the STI should match the cassette.

    Front:
    3x should work with any double. I've not seen one that wouldn't.
    3x for 8/9/10 may cause some rubbing if you use it with a 7-sp FD.
    You need to experiment with the FD settings for trim and rub.

    Rear:
    7-sp STIs will work with 7.
    7-sp STIs will work with 8-sp cassettes, but only shift 7 cogs. Pick the one you won't ride.
    Many 7-sp RD's will work with 8-sp STI's and 8-sp cassettes, but you need to check the range of the RD.
    Some 7-sp RD's will work with 9-sp STI's and 9-sp cassettes, but you need to check the range of the RD.

    8-sp STIs will work with 7-sp cassettes, and freewheels, and you'll have a dead shift.
    8-sp STIs will work with 8 all around.

    8-sp STI will sometimes work with 9-sp FD/RD, but only with an 8-sp cassette.
    8-sp cranksets will often work with 9-sp setups, just watch for the gap between the chain rings sucking up a narrow chain.
    8-sp RD's will often work with 9-sp STI's. The range is the same. Sometimes, the geometry is a bit off. Trial and error.

    9-sp STI's do not work with 7 or 8 or 10 cassettes.
    9-sp STI's often work with some 7-sp RD's, some 8-sp RD's, but I don't know about 10-sp RD's.
    9-sp RD's do not generally work with 10-sp STI's, but some of you have made it work. I could not.
    I think Sheldon Brown has a procedure. I tried it, it didn't work, but consider the wrench....

    I try to match the best I can, but I've run the following successfully.

    7-sp Suntour GPX all around, 9-sp cassette and 9-sp Sora STI's. No problem.
    7-sp Exage with 7-sp RSX STI's and 7-sp Sora STI's.
    I've found that Exage and LX100 7-sp will not handle 8-sp, RD or FD.
    7-sp 600EX all around with 7-sp RSX STI's
    7-sp Exage with 8-sp Sora STI's.

    8-sp Sora all around with 7-sp Sora STI's (7-sp cassette).
    8-sp 600 with 7-sp RSX STI's (7-sp cassette)
    8-sp 600 with 8-sp RX100, 105, and 600.
    8-sp 600 with 9-sp 105 STI's and 9-sp Ultegra STI's (9-sp cassette)

    Overall, 7/8 seem to mix well, and lower end 7ssp components don't generally like 8-sp anything.

    I think all 105 9-sp STI L shifters are triple. I think all L STI's should have been made as triples, anyway.

    It's much easier to be specific, my friend, and you know how to reach me.

    Robbie ♪♫♪...☻

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  8. #8
    Senior Member afilado's Avatar
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    Thank you, Robbie. That pretty much puts a nail in it for me. Now that I see it laid out this way I have a feeling I may have seen some or much of it before. If that's so, I'm grateful for your patient repeat.

    J

  9. #9
    I got 99 projects BluesDaddy's Avatar
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    ^ +1
    Looks like we're on Julian. I was using the "search" to do some research and found this post. Thanks!

  10. #10
    Bike Junkie roccobike's Avatar
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    Yes you can use a triple 105 shifter on a double. However, with some of the newer, 9 & 10 speed shifter sets, you have to be sure that the shifter cable is set just right or you can destroy the shifter. Ironically, it's the recommended Shimano set up that creates the problem. The recommeded set up uses the limits of the derailer to stop the extra shift (click) so that the shifter works just like a double shifter. But if you pull the shifter hard it can jam and can not be repaired (happened to a couple of freinds). I asked about this on the BIke Mechanics forum and they recommended using the 2-3 shift which will prevent damage to the shifter. The downside is, if you do that, you'll have an extra "click" in the shifter that can result in the cable going slack. Most non-tech type cyclists would freak if that happened. I don't think we need to worry about that here on the C&V.
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  11. #11
    Senior Member RobbieTunes's Avatar
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    +1
    When I use a triple on a double setup, I set it so I get three shifts, and I get a little rub on the extreme inside and extreme outside, but I don't mess up the shifter.

    It would make sense that grabbing a buttful of shifter with already taut cable would be a no-no. For some reason, the 8-sp shifters doing 7-sp work handle it.

    Robbie ♪♫♪...☻

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  12. #12
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    Will a DA 9 spd (2 ring) set up work on a triple der. up front?

  13. #13
    Senior Member afilado's Avatar
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    Heck if I know. In the fine print disclaimer above Robbie's tutorial he says he's leaving out Dura Ace. Something different about it.

    J

  14. #14
    Fuji Fan beech333's Avatar
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    Quote Originally Posted by afilado View Post
    Heck if I know. In the fine print disclaimer above Robbie's tutorial he says he's leaving out Dura Ace. Something different about it.

    J
    Isn't there a DA brifter that will only work with one particular group?
    Seeking a 165mm Sugino Super Mighty track crankset.

  15. #15
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    Quote Originally Posted by look171 View Post
    Will a DA 9 spd (2 ring) set up work on a triple der. up front?
    I should ask if a standard 9 spd STI shifter work with a triple 105 up front?

  16. #16
    Senior Member RobbieTunes's Avatar
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    Quote Originally Posted by look171 View Post
    I should ask if a standard 9 spd STI shifter work with a triple 105 up front?
    I leave DA out of the mix.
    If you want it to work right, use DA STI's with the matching DA RD and no one gets hurt.
    One reason you can often get 8-sp DA STI's cheaper than 8-sp 600 STI's.

    Regarding Look171's question, a "std" 9-sp STI (Sora, Tiagra, 105, Ultegra) will work with a triple 105 FD, 8-sp and up. I've run triple FD's in 105, Ultegra, and DA on bikes that had doubles. No biggie, just more cage.

    The basic premise of almost all of this is: The FD/RD will do what the cable tells it to.

    When choosing this stuff, start with the rear wheel, because what it can hold will determine what you can run.
    Then, you go to the STI's that will run what the rear wheel can hold.

    Now, you observe the basic premise above and look around for Murphy.

    Look at the RD and see if there's some reason it won't do as it's told (7-sp not having the range, or it being a DA).
    In general, RD's that can move the range will do what the shifters tell them to.

    Now look at the FD, and generally, your only problem will be chain rub due to cage sizes.
    7-sp FD's are notorious for rubbing with 8-sp STI's.

    When dealing with triple L STI's, you have Sora, which generally give you 2 solid clunks, and most of the other triple L shifters, which give you several smaller shifts (the "trim" that people often talk about). The triple STI's will work as doubles with double FD's and double cranksets, but careful setting of the parameter screws is required.

    On the triple L shifters that I've used with double setups, non-Sora's, I've used the 2 "inside" clicks to run the small chain ring, and the two "outside" clicks to run the large chain ring. I let the chain rub tell me to adjust the shifter, because if I look down, I'm sure I'll hit a mailbox.

    Lest I forget, I recommend running the exact size chain for the gears you have. Rules out that issue.
    Last edited by RobbieTunes; 01-21-11 at 07:23 PM.

    Robbie ♪♫♪...☻

    I'm not a doctor, but I watch them on TV.

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  17. #17
    Senior Member afilado's Avatar
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    Thanks again, Robbie. This stuff is golden.

    J

  18. #18
    Senior Member DVC45's Avatar
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    Quote Originally Posted by RobbieTunes View Post
    because if I look down, I'm sure I'll hit a mailbox.
    I grazed a parked car couple weeks ago doing just that.
    "Cycling is for pleasure not penance"

  19. #19
    Senior Member RobbieTunes's Avatar
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    Quote Originally Posted by DVC45 View Post
    I grazed a parked car couple weeks ago doing just that.
    That split second between grazing the car and recovering the bike is exciting, isn't it?

    Robbie ♪♫♪...☻

    I'm not a doctor, but I watch them on TV.

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  20. #20
    Senior Member DVC45's Avatar
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    Truly!

    No damaged to the car or me. And no one was watching...... I think.
    "Cycling is for pleasure not penance"

  21. #21
    Senior Member afilado's Avatar
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    Your guardian angel has a sense of humor.

    J


    Quote Originally Posted by DVC45 View Post
    Truly!

    No damaged to the car or me. And no one was watching...... I think.

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