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Conference noted::bicycle

Title: Bicycling
Notice:Bicycling for Fun
Moderator:JAMIN::WASSER
Created:Mon Apr 14 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3214
Total number of notes:31946

748.0. "Seat post slips...." by SCOMAN::DESHARNAIS (NO DUKES !) Fri Jun 24 1988 16:53

    I have a Shogun 500 touring bike with a seat that gradually slips
    down out of adjustment.  I have tightened the seat post screw as
    far as it will go but the seat still drops within a few days of 
    riding.
    
    Does anyone have any solutions to this problem?
    
    Thanks,
    Denis
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748.1possible fixes for seatpost slip...SUSHI::KMACDONALDAntiFenestration SpecialistFri Jun 24 1988 17:1219
>    I have a Shogun 500 touring bike with a seat that gradually slips
>    down out of adjustment.  I have tightened the seat post screw as
>    far as it will go but the seat still drops within a few days of 
>    riding.
    
Um, sounds like the post may be just a *hair* too small. The following 
might help ...

1. new seat post bolt (I prefer the kind with Allen heads on each end)

2. new seat post

3. shim the post with a layer of rubbery electrical tape or (my 
favorite) a piece of a Schlitz beer can.

Make sure that you don't deform the seat lug by cranking down on it too 
hard. I've had these stretch for that reason and it ain't fun ...

                                               ken
748.2Shim it...BTO::MAYOTFri Jun 24 1988 17:128
    If the post is not sized correctly replace it with one of appropriate
    diameter.  A cheaper alternative is to shim it.  You could take
    a rectangular piece of flashing, about 1.5" by 3" and wrap it
    around the post and insert it into the tube.  I think I have 
    also seen an insert for this purpose in some bikes so maybe
    there is an off the shelf product/part available.
    Tom
    
748.3check if seat post nut rotates or if lug edges touchVAXWRK::TCHENMon Jun 27 1988 15:108
    I have a Shogun 1500 with a similar problem. I noticed that when
    I tighten the seat-post bolt with an allen wrench, the nut on the
    opposite side rotates. This nut looks like it is held in place by
    a split expansion ring. I have to see what to do about this.

    If your problem is that the edges of the seat post lug are nearly
    touching so that no further tightening is possible, then the insert
    mentioned in .2 can be bought. 
748.4Greasy seat-post?RDGENG::MACFADYENRoderick MacFadyenMon Jun 27 1988 15:575
    Is the seat-post greasy? If it is, cleaning all the grease off with
    spirit might help (don't know if this would be considered good practice
    though, since most seat-posts seem to be greasy).
    
    Rod
748.5ASIC::CRITCHLOWMon Jun 27 1988 16:584
I would worry about the post getting stuck if the grease were removed.



748.6Ah, the ol' beer can trick!SCOMAN::DESHARNAISNO DUKES !Fri Jul 01 1988 15:2314
    Thanks for the information.  
    
    The beer can shim trick mentioned in .1 worked.  The seat hasn't
    lowered at all for most of the week.
    
    RE .3  Can you tell me what this insert is called and where it can
    be bought?
    
    RE .4  The seat post, as with many other parts of the bicycle, is
    coated with grease to prevent it from rusting into the tube.
    
    Regards,
    Denis