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Replacement Seatpost Bolts – eBay, Amazon or??? that won’t rust…..

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  • March 29, 2017 at 11:48 am #26949
    Team EPO

    Can anyone recommend a good choice of bolt to replace my Cannondale Synapse Seatpost Bolt as the current one is rusting?  Worried an eBay replacement might be flaky ??

     

    Thanks

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Viewing 12 replies - 1 through 12 (of 12 total)
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  • March 31, 2017 at 11:12 am #890133
    0
    fenix

    Its usually the head that

    Its usually the head that rusts though ? 

    March 30, 2017 at 2:07 pm #890131
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    CXR94Di2

    Wise words from p3t3 every
    Wise words from p3t3 every bolt I’ve taken off a piece of outdoor equipment in the last ten years has had copper grease on the threads

    March 30, 2017 at 9:38 am #890129
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    P3t3

    Some more imaginatove options

    Some more imaginatove options:

    – Take it off, clean it up with emery paper and paint it black, silver… (or whatever colour you have lying around).  I mean seriously, its just a bolt and another cannondale one will just rust again….

    – Buy some copper grease and pop a blob on the bolt, then use the copper grease on every other fastener on the bike if and when you have to undo them.  

    – Ignore it.  

    March 30, 2017 at 8:11 am #890127
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    turboprannet

    CXR94Di2 wrote:

    CXR94Di2 wrote:
    That is why it’s cheaper to pop to your local fastener supplier. There is always one near by. My local one has supplied dozens of bolts and nuts for me over the years normally for my motorcycles . I rarely buy plain steel bolts unless it requires it for tensile properties. Stainless bolts are slightly more brittle than plain steel(depending on which grade stainless you buy)

    Cannondale seatpost bolts have a bevelled edge to them to fit the recess on the post. If “your local fastener supplier” has the exact measurment then great but it doesn’t look like the original poster is replacing for tensile difference or performance improvements – they just want a new bolt for their cdale seatpost. Qwerty, Cannondalespares or even the shop they bought it from might have one

    Original poster – I actually have a C3 post (25.4mm) in the shed if you want it.

    March 30, 2017 at 6:41 am #890125
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    CXR94Di2

    That is why it’s cheaper to
    That is why it’s cheaper to pop to your local fastener supplier. There is always one near by. My local one has supplied dozens of bolts and nuts for me over the years normally for my motorcycles . I rarely buy plain steel bolts unless it requires it for tensile properties. Stainless bolts are slightly more brittle than plain steel(depending on which grade stainless you buy)

    March 29, 2017 at 10:30 pm #890123
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    DrG82

    Just measure it and buy some
    Just measure it and buy some on e-bay. They’ll all be metric bolts and will be fine. Even if it is dodgy (which I very much doubt it will be) it’s only being used at relatively low torque.
    I’ve bought loads of random bolts on eBay, the biggest problem I’ve ever had is having to buy a bag of 10 when I only need one and now I have a box of random bolts that will likely never be used

    March 29, 2017 at 10:00 pm #890121
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    wycombewheeler

    It’s strange I remember as a

    It’s strange I remember as a student buying a set of ti allen bolts for both skewers and the seat post, but they don’t seem to be as common now. Less theft of saddles and wheels? 

     

    March 29, 2017 at 6:20 pm #890119
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    Acm

    As said, the stock bolts will
    As said, the stock bolts will be chrome plated, which wears off with use and allows the bolt to rust. Get some identical A2 stainless steel bolts from either a local or online fastener supplier (it’s sometimes worth ordering extra; it normally doesn’t cost much more).
    Chances are the bolts will be standard metric bolts. The number after the M is the outer diameter of the thread, and the length is the length of the bolt (not including the head). If the bolts happen to be a funny length, go for a slightly longer bolt and then cut it down if need be

    March 29, 2017 at 5:25 pm #890117
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    CXR94Di2

    Find a local screws and
    Find a local screws and fastener supplier. Buy stainless bolts. Take one bolt with you.

    March 29, 2017 at 5:19 pm #890115
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    tourdelound

    I’d drop Qwerty Cycles an

    I’d drop Qwerty Cycles an email, Info@QwertyCycles.co.uk. They’re a  UK Cannondale spares and accessories specialist, used them a couple of times and they were very helpful.

    March 29, 2017 at 2:16 pm #890113
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    turboprannet

    try ringing the people who

    try ringing the people who run cannondalespares.com as they are a uk cannondale parts stockist. Very good site

    March 29, 2017 at 1:59 pm #890111
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    StraelGuy

    The current one will be

    The current one will be chrome plated plain steel. If you buy a ti or stainless one off eBay, you should be fine (if you go for ti, use plenty of anti-seize). Your biggest challenge might be working out the spec of the bolt ie thread pitch and which ‘M’ size it is.

     

    Update: Tons of places sell the Cannondale ‘KP300’ kit which contains the screw but none of them state the bolt size sad.

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