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  1. #1
    jbf
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    Alum chainring bolts for granny OK ?

    It seems most high end cranks come with Alum outer bolts and steel inner bolts. Can I switch to alum inner bolts or will I have problems here? I am a 160 lb and ride east coast trails, my granny gets lots of use.

  2. #2
    Jag
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    You should be ok but....

    Quote Originally Posted by jbf
    It seems most high end s come with Alum outer bolts and steel inner bolts. Can I switch to alum inner bolts or will I have problems here? I am a 160 lb and ride east coast trails, my granny gets lots of use.


    I sheared mine on a steep incline while I was out of saddle, so make sure you keep them torqued to the proper spec. (I believe mine may of loosened up a bit when I sheared them). I run one cromoly bolt with the other alloy bolts and now I have more peace of mind.


    Jag
    Dad...isn't the word "abbreviation" being hypocritical being so long.... My 11 year old daughter.

  3. #3
    Jm.
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    I've had alu granny-ring bolts loosen up on me as well. They are more finnicky also in terms of overtorquing, so you want it to be "just right" and check them occasionally.
    I know in my heart that Ellsworth bikes are more durable by as much as double. AND they are all lighter...Tony Ellsworth

  4. #4
    6x7=Dont Panic!
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    Titanium might be a better choice for granny bolts. I have never had a problem with an alu outer bolt though.
    Herro prease

  5. #5
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    AL fine for granny, but use a torque wrench.

    I put at least 7,000 miles over 3 years on some generic AL chainring bolts and haven't had any trouble except for 1 or 2 that cracked from too much torque while installing. Just grease them and torque to ~7-8 Nm and they'll be fine. Torx head are slightly stronger since less material is removed compared to hex head. The ones that cracked did so at the head around the cut-out for the hex key, but that was at ~10 Nm.

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