Have I Accidentally Over Torqued Brake Lever/Brifter Clamps?
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  1. #1
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    Unhappy Have I Accidentally Over Torqued Brake Lever/Brifter Clamps?

    I was doing an installation of a carbon drop bar today, and since my torque wrench didn't arrive until this evening, I hand tightened the fastening clamps gently using the short end of an L shaped allen wrench in order to test the fit a little more than an inch of leverage.

    The carbon bar's manufacturer gave me a torque specification of 4Nm, which is pretty low, so I just hand tightened to the point they stopped moving under a reasonable, below what you would see in everyday usage amount. However, upon removing the bars, I noticed that the clamps had left some shallow imprints on the bars where I'd fastened them. Is this normal? I've always wondered whether the flat clamp surfaces would have trouble interfacing with the contours of the drop bar.

    Have I Accidentally Over Torqued Brake Lever/Brifter Clamps?-screen-shot-2019-04-20-10.26.31-pm.jpgHave I Accidentally Over Torqued Brake Lever/Brifter Clamps?-screen-shot-2019-04-20-10.27.42-pm.jpgHave I Accidentally Over Torqued Brake Lever/Brifter Clamps?-screen-shot-2019-04-20-10.27.56-pm.jpg

    The grooves caused on my bars are not jagged or sharp or serrated, but are little dents. I later received my torque wrench and tested it on a useless part, and 4nm is definitely more force than I had used during hand tightening. Still, it is pretty unnerving to see the carbon/resin dent, and I was wondering if the bars are still usable.

    Also, should I file/sand the edges of the clamp to round them out a bit?

    Thanks

  2. #2
    'brifter' is a lame word.
    Reputation: cxwrench's Avatar
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    They're 'shifters' and no...your bars should be fine.
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  3. #3
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    Thanks, good to hear that! I guess BRIFTER clamps wouldn't be designed the way they are if it actually caused issues.

    jk, funny thing is I was just reading a thread where you ranted on about calling em shifters lol

  4. #4
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    Quote Originally Posted by hihihi8 View Post
    Thanks, good to hear that! I guess BRIFTER clamps ....l

    Ohh, ​BURN!!!!!!!
    "L'enfer, c'est les autres"

  5. #5
    Schuylkill Trail Bum
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    One of these days, we should post a poll about whether "brifter" is or is not, in fact, a lame word.

  6. #6
    Rub it............
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    Quote Originally Posted by SPlKE View Post
    One of these days, we should post a poll about whether "brifter" is or is not, in fact, a lame word.

    Poll created
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  7. #7
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    Quote Originally Posted by hihihi8 View Post
    Thanks, good to hear that! I guess BRIFTER clamps wouldn't be designed the way they are if it actually caused issues.

    jk, funny thing is I was just reading a thread where you ranted on about calling em shifters lol
    The funny thing is having to ask how to properly mount your shifters, and then poking the guy who comes to your aide with a stick.
    Too old to ride plastic

  8. #8
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    Quote Originally Posted by frdfandc View Post
    Poll created
    Where the poll is?

  9. #9
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    Weird they dented like that but I'm pretty sure you would have heard a crunch if you did some real damage.

    No, don't file or sand your bars.

  10. #10
    Rub it............
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    Quote Originally Posted by SPlKE View Post
    Where the poll is?
    Lounge

    Sent from my SM-G930V using Tapatalk
    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  11. #11
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    Quote Originally Posted by frdfandc View Post
    Lounge
    Thank!

    Now if I can figure out a way to stuff the ballot box in favor of the word "brifter" being non-lame, we'll be all set.

  12. #12
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    Quote Originally Posted by Jay Strongbow View Post
    No, don't file or sand your bars.
    I was referring to sanding the clamps on the shifters so that the edges weren't as sharp, and so that it had a rounder profile and interfaced with the round bend of the bars better
    Have I Accidentally Over Torqued Brake Lever/Brifter Clamps?-screen-shot-2019-04-22-1.39.27-pm.jpg

  13. #13
    Rub it............
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    Quote Originally Posted by hihihi8 View Post
    I was referring to sanding the clamps on the shifters so that the edges weren't as sharp, and so that it had a rounder profile and interfaced with the round bend of the bars better
    Click image for larger version. 

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    All you need to do is torque them to spec. Nothing more, nothing less.

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    You can't fix stupid.

    Quote Originally Posted by JoeDaddio

    I kind of wish it were legal to staple people in the face.

  14. #14
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    i'm impressed by OP using sort of software to draw up the illustration.
    Must be a graphics guy

  15. #15
    'brifter' is a lame word.
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    Quote Originally Posted by aclinjury View Post
    i'm impressed by OP using sort of software to draw up the illustration.
    Must be a graphics guy
    Yeah, definitely some skills there.
    I work for some bike racers
    I've got some bikes, some guns,
    and a bunch of skateboards

  16. #16
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    Quote Originally Posted by aclinjury View Post
    i'm impressed by OP using sort of software to draw up the illustration.
    Must be a graphics guy
    I'm pretty sure you can do all that with only Paint....
    "L'enfer, c'est les autres"

  17. #17
    Huge in Japan
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    The navigation wheel looks like 3D modeling environment (similar to the one in Inventor).
    Interwebs bumpersticker goes here

  18. #18
    tlg
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    It's Autocad. Yes, similar to Inventor.
    Attached Thumbnails Attached Thumbnails Have I Accidentally Over Torqued Brake Lever/Brifter Clamps?-autocad.png   Have I Accidentally Over Torqued Brake Lever/Brifter Clamps?-inventor.png  
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