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  1. #1
    Slow rider on fast wheels
    Reputation: theychosenone's Avatar
    Join Date
    Mar 2006
    Posts
    52

    Worn/damaged rear hex-nut on Aero Carbon seatpost?

    Hi guys,

    Recently I bought the SLC-SL frameset, which came with the Aero Carbon seatpost. As I had to readjust the saddle position on the seatpost, I had to retighten the rear hex-nut on the seatpost for the adjustments.

    However, although I used a good Parktool torque wrench and tightened the rear hex-nut to 6N.m according to the Cervelo user manual, upon tightening to the recommended torque, I heard a creak sound in the seatpost area, and noticed that a section of the rear hex-nut's thread (just above the bottom base plate supporting the saddle rails) had worn off, as the black coating on the rear hex-nut's thread had been exposed to its original silver colour.

    I wish to check if this is indicative that I had damaged the rear hex-nut, although I had following the recommended torque specifications exactly. I'm not exactly a bike mechanic so I have no idea if this is a cause for concern.

    Thanks for any help and feedback!

  2. #2
    RoadBikeReview Member
    Reputation: Cheers!'s Avatar
    Join Date
    Aug 2006
    Posts
    1,079
    The rear "thing" you are tightening is a bolt. Not a nut. It's a metric M6x25mm if I remember correctly. Just goto the hardware store and find another one, go ask them for a Socket Head Cap Screw grade 8.8 or above. If you are a weight weenie you could replace it with a titanium one. Regardless which you choose to go with put some anti-seize on the threads.

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