Re: [RBW] Subtle, insidious seatpost slippage on my Clem H driving me crazy

2021-09-09 Thread Joe Bernard 
I had this problem with several MIT Rivs and the stock post which was 
solved with Nitto replacements. The problem here is the OP says he used a 
Thompson, too..I'll be surprised if a Nitto is nominally larger than BOTH 
of them. 

Joe Bernard

On Thursday, September 9, 2021 at 4:14:00 PM UTC-7 Patrick Moore wrote:

> Re-reading this sentence, I realize that the assertion is incomplete. It 
> may help to add that sometimes a top quality aluminum post of the same 
> nominal diameter, like a Nitto, is just sufficiently wider to solve the 
> problem.
>
> On Thu, Sep 9, 2021 at 5:07 PM Patrick Moore  wrote:
>
>> ...
>
>
>>
>> I've also found that some seatposts marked as having the same diameter
>> are micrometrically smaller than others, enough to cause slipping in
>> some frames.
>>
>

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Re: [RBW] Subtle, insidious seatpost slippage on my Clem H driving me crazy

2021-09-09 Thread Patrick Moore 
Re-reading this sentence, I realize that the assertion is incomplete. It
may help to add that sometimes a top quality aluminum post of the same
nominal diameter, like a Nitto, is just sufficiently wider to solve the
problem.

On Thu, Sep 9, 2021 at 5:07 PM Patrick Moore  wrote:

> ...
>
> I've also found that some seatposts marked as having the same diameter
> are micrometrically smaller than others, enough to cause slipping in
> some frames.
>

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Re: [RBW] Subtle, insidious seatpost slippage on my Clem H driving me crazy

2021-09-09 Thread Patrick Moore 
I've had that problem with several frames, and I have used either blue
Loctite or the fiber gel developed for carbon fiber components, and
both products stopped the slipping, at least with careful tightening
of the sp collars.

On one frame with a seatpost collar instead of integrated sp clamp, I
replaced the first rather delicate clamp with a sturdier one, which
let me clamp the post with a bit more, and it turns out sufficient,
force.

I've also found that some seatposts marked as having the same diameter
are micrometrically smaller than others, enough to cause slipping in
some frames.


On Thu, Sep 9, 2021 at 1:40 PM Alex K  wrote:
>
> Anybody else have issues with their seat post slipping on their Clem H or any 
> other Rivs?  This is driving me crazy.  I am infatuated with this bike.  
> Favorite ride of all time.  I have a perfect 30 mile SF-Marin Headlands-SF 
> loop that keeps me sane.What is driving me insane however is that my seat 
> post slips down about 1-1.5 inches every time I ride this ride, which 
> involves quite a lot of fire trail.  I have cleaned the inside of the seat 
> tube, I have applied friction grease, I changed the seat bolt and greased and 
> regressed it.  I have heard that maybe a Coke can might work as a shim, but 
> I'd rather resolve the issue without hodging and podging.  Any thoughts?  
> Advice?  Commiseration?  Thanks all.  I've ridden on a Kalloy and a Thomson 
> seat post, and it doesn't matter which seat post I use, there is slippage.
> Alex
>
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-- 

---
Patrick Moore
Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum

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Re: [RBW] Subtle, insidious seatpost slippage on my Clem H driving me crazy

2021-09-09 Thread David Hallerman 
Could try carbon fiber paste instead of grease on seatpost, in seat tube.
If you do that, be sure to clean out old grease first.

Another thought, if you have access to a knurling tool; perhaps your shop
has one. That would raise a section of post that’s inside the frame.

- Dave



On Thu, Sep 9, 2021 at 3:59 PM Eric Daume  wrote:

> On my Gunnars that all featured slipping seat posts, I eventually used a
> Coke can shim to fix the issue.
>
> Eric
>
> On Thu, Sep 9, 2021 at 3:40 PM Alex K  wrote:
>
>> Anybody else have issues with their seat post slipping on their Clem H or
>> any other Rivs?  This is driving me crazy.  I am infatuated with this
>> bike.  Favorite ride of all time.  I have a perfect 30 mile SF-Marin
>> Headlands-SF loop that keeps me sane.What is driving me insane however
>> is that my seat post slips down about 1-1.5 inches every time I ride this
>> ride, which involves quite a lot of fire trail.  I have cleaned the inside
>> of the seat tube, I have applied friction grease, I changed the seat bolt
>> and greased and regressed it.  I have heard that maybe a Coke can might
>> work as a shim, but I'd rather resolve the issue without hodging and
>> podging.  Any thoughts?  Advice?  Commiseration?  Thanks all.  I've ridden
>> on a Kalloy and a Thomson seat post, and it doesn't matter which seat post
>> I use, there is slippage.
>> Alex
>>
>> --
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>> 
>> .
>>
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> .
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Re: [RBW] Subtle, insidious seatpost slippage on my Clem H driving me crazy

2021-09-09 Thread Eric Daume 
On my Gunnars that all featured slipping seat posts, I eventually used a
Coke can shim to fix the issue.

Eric

On Thu, Sep 9, 2021 at 3:40 PM Alex K  wrote:

> Anybody else have issues with their seat post slipping on their Clem H or
> any other Rivs?  This is driving me crazy.  I am infatuated with this
> bike.  Favorite ride of all time.  I have a perfect 30 mile SF-Marin
> Headlands-SF loop that keeps me sane.What is driving me insane however
> is that my seat post slips down about 1-1.5 inches every time I ride this
> ride, which involves quite a lot of fire trail.  I have cleaned the inside
> of the seat tube, I have applied friction grease, I changed the seat bolt
> and greased and regressed it.  I have heard that maybe a Coke can might
> work as a shim, but I'd rather resolve the issue without hodging and
> podging.  Any thoughts?  Advice?  Commiseration?  Thanks all.  I've ridden
> on a Kalloy and a Thomson seat post, and it doesn't matter which seat post
> I use, there is slippage.
> Alex
>
> --
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> "RBW Owners Bunch" group.
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> 
> .
>

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[RBW] Subtle, insidious seatpost slippage on my Clem H driving me crazy

2021-09-09 Thread Alex K 
Anybody else have issues with their seat post slipping on their Clem H or 
any other Rivs?  This is driving me crazy.  I am infatuated with this bike. 
 Favorite ride of all time.  I have a perfect 30 mile SF-Marin Headlands-SF 
loop that keeps me sane.What is driving me insane however is that my 
seat post slips down about 1-1.5 inches every time I ride this ride, which 
involves quite a lot of fire trail.  I have cleaned the inside of the seat 
tube, I have applied friction grease, I changed the seat bolt and greased 
and regressed it.  I have heard that maybe a Coke can might work as a shim, 
but I'd rather resolve the issue without hodging and podging.  Any 
thoughts?  Advice?  Commiseration?  Thanks all.  I've ridden on a Kalloy 
and a Thomson seat post, and it doesn't matter which seat post I use, there 
is slippage.  
Alex

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