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  1. #1
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    crank arm fixing bolts

    HI all... I just changed my bottom bracket from cup and cone to a cartridge style... i didn't get any crank arm fixing bolts... what size are they? can i get them from a good hardware store ? any and all help would be great....

    thanks a ton

    rc

  2. #2
    use your best eye kenhill3's Avatar
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    Quote Originally Posted by rc50 View Post
    HI all... I just changed my bottom bracket from cup and cone to a cartridge style... i didn't get any crank arm fixing bolts... what size are they? can i get them from a good hardware store ? any and all help would be great....

    thanks a ton

    rc
    More detailed information needed in order for anyone to begin imparting any 'wisdom'. Type/model, square taper or splined, if splined what pattern, etc..
    "I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.

  3. #3
    <>< SoonerBent's Avatar
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    One side is left hand thread so a hardware store is a no-go. Don't you have the ones from the old BB. If not your LBS or someplace like biketoolsetc.com will have them.

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    hi sorry i agree.... it is a shimano square tapered.. 68mm 107 mm long... sorry again.. thanks for any and all help
    i am just getting into working on bikes... so know almost nothing but what i read..
    again sorry and thanks

    rc

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    no sorry the old BB was a cup and cone style and used nuts to hold the crank arms on...

    thanks for the info

    RC

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    Quote Originally Posted by SoonerBent View Post
    One side is left hand thread so a hardware store is a no-go.
    That is not true. Both bolts will be a standard RH thread. The easiest thing to do is go to your LBS (Local Bike Shop) and get some there. Otherwise, they are almost certainly metric and my guess would be M6x1mm, although I'm not sure.

  7. #7
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    i have tried the "local" bike shop thought i was crazy as they sale only the current in "fad" bikes lol what a joke... neely to say they didn't have them....
    thanks a ton

  8. #8
    * vpiuva's Avatar
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    Use the ones off the BB you just removed. They're the same M8*1 bolts. Your standard hardware metric bolt would probably be an M8*1.25.
    Last edited by vpiuva; 10-03-07 at 12:54 PM.

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    hi thanks... i would do just that.... but the BB i removed was an old cup and cone type BB it used nuts... not bolts...

    thanks..

    RC

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    hi thanks for all the help... i checked biketoolsetc.com and they say it takes a standard english thread.... so thanks a ton people for all the help.... have a great one!!!!


    RC

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    * vpiuva's Avatar
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    (click to buy)

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    * vpiuva's Avatar
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    Quote Originally Posted by rc50 View Post
    hi thanks for all the help... i checked biketoolsetc.com and they say it takes a standard english thread.... so thanks a ton people for all the help.... have a great one!!!!


    RC

    Standard english thread is for the cups, not the crankarm fixing bolt

  13. #13
    <>< SoonerBent's Avatar
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    Quote Originally Posted by TurdFerguson2 View Post
    That is not true. Both bolts will be a standard RH thread. The easiest thing to do is go to your LBS (Local Bike Shop) and get some there. Otherwise, they are almost certainly metric and my guess would be M6x1mm, although I'm not sure.
    You're right. I didn't completely engage the brain before typing.

  14. #14
    use your best eye kenhill3's Avatar
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    Quote Originally Posted by rc50 View Post
    hi thanks... i would do just that.... but the BB i removed was an old cup and cone type BB it used nuts... not bolts...

    thanks..

    RC
    Sounds like his old BB was for an old COTTERED crank. I suspected that when he mentioned cup and cone.
    "I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.

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    hi nope was not a cottered crank... old sugino crank thanks

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    thanks for all the help but check this web sight ...

    http://www.biketoolsetc.com/index.cg...d=TA-LN3968107

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    Well, there are a lot of old cup and cone BB's that are cotterless, that use a threaded stud that requires a nut as opposed to a bolt. I imagine that is what he has, since he didn't say anything about new cranks.

    I'm also assuming he is a he which may or may not be true.

  18. #18
    use your best eye kenhill3's Avatar
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    Quote Originally Posted by rc50 View Post
    hi nope was not a cottered crank... old sugino crank thanks
    No, thank YOU! Jeez, the old school stuff is hard to dismember sometimes. LOL.
    "I tell you, We are here on earth to fart around, and don't let anybody tell you any different." - Kurt Vonnegut jr.

  19. #19
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by rc50 View Post
    thanks for all the help but check this web sight ...

    http://www.biketoolsetc.com/index.cg...d=TA-LN3968107
    Your local bike shop would be best. They probably have a ton of them. You might even be able to get on that works with an allen wrench...those will work too. Should only cost you a couple of bucks.
    Stuart Black
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  20. #20
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    Quote Originally Posted by cyccommute View Post
    Your local bike shop would be best. They probably have a ton of them. You might even be able to get on that works with an allen wrench...those will work too. Should only cost you a couple of bucks.
    The LBS is certainly the place and they will be free to low cost for the standard hex head types. The newer allen wrench types may be a few dollars but they are more convenient and don't require dust covers.

    BTW, the threading is M8x1.0mm and your hardware store is not likely to have metric bolts in that thread pitch.

  21. #21
    rebmeM roineS JanMM's Avatar
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    I had a crank axle or two in the past that used nuts instead of bolts. (three-piece)

  22. #22
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    Yep, seen plenty of square tapers with threads at the end. Your LBS should absolutely have a set of crank bolts. In fact, your new BB should have come with them.

  23. #23
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by tellyho View Post
    Yep, seen plenty of square tapers with threads at the end. Your LBS should absolutely have a set of crank bolts. In fact, your new BB should have come with them.
    Not usually. All of my crank bolts came with the crank, not the BB.
    Stuart Black
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  24. #24
    rebmeM roineS JanMM's Avatar
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    Replaced the BB and the Crankset on my RANS last winter. They both came with bolts. Can't use all 4 at the same time so I rotate them out. Ha, ha.

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