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PostPosted: Thu Jun 13, 2013 1:31 pm 
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Joined: Sun Sep 27, 2009 4:28 pm
Posts: 220
I have a Parlee z0 fitted with the proper size Thomson masterpiece seat post and I notice that the post slips a
Couple millimeters per a 2 hour ride with 6nm of force on the clamp and a generous coat of carbon paste. Any suggestions? Thanks


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Posted: Thu Jun 13, 2013 1:31 pm 


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PostPosted: Thu Jun 13, 2013 1:37 pm 
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Location: South West England
May be a silly question but are you 100% sure it's the right size post? Should be 31.6mm

Is the post/inside of the seat tube worn at all?

How much do you weigh?

A quick/easy temporary fix would be to wrap the inserted end of the post in a thin layer of electrical tape.

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Campagnolo; because it's a bicycle, not a fishing rod.
M∆SON Definition x Camapgnolo endurance build - ~8.4kg


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PostPosted: Thu Jun 13, 2013 1:51 pm 
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alexh wrote:
May be a silly question but are you 100% sure it's the right size post? Should be 31.6mm

Is the post/inside of the seat tube worn at all?

How much do you weigh?

A quick/easy temporary fix would be to wrap the inserted end of the post in a thin layer of electrical tape.


Just measured it with digital calipers. The post measure 31.6 millimeters so probably within tolerance. The post isn't worn and the frame is new.


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PostPosted: Thu Jun 13, 2013 1:51 pm 
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I forgot to add I weight 155 pounds


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PostPosted: Thu Jun 13, 2013 1:54 pm 
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Location: South West England
I see no reason why it should be slipping in that case, unless there is an issue with the clamp? Try some threadlock/a new bolt maybe?

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Campagnolo; because it's a bicycle, not a fishing rod.
M∆SON Definition x Camapgnolo endurance build - ~8.4kg


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PostPosted: Thu Jun 13, 2013 2:08 pm 
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Could be your torque wrench is out?

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Blog: http://thesetbackpost.com/


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PostPosted: Thu Jun 13, 2013 2:19 pm 
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There has to be something else going on here. There is nothing about a Thomson seatpost that should allow unusual slip.


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PostPosted: Thu Jun 13, 2013 2:33 pm 
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Should I try more clamping force? Say 6.5nm?


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PostPosted: Thu Jun 13, 2013 2:48 pm 
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Ufgators wrote:
Should I try more clamping force? Say 6.5nm?


I'd personally check the clamp first.

_________________
Campagnolo; because it's a bicycle, not a fishing rod.
M∆SON Definition x Camapgnolo endurance build - ~8.4kg


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PostPosted: Thu Jun 13, 2013 2:53 pm 
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alexh wrote:
Ufgators wrote:
Should I try more clamping force? Say 6.5nm?


I'd personally check the clamp first.


What do I look for in defective clamp?


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PostPosted: Thu Jun 13, 2013 2:57 pm 
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Ufgators wrote:
What do I look for in defective clamp?


Shearing of the bolt/nut, or the clamp may be slightly too large for the frame and therefore unable to provide suitable clamping force.

_________________
Campagnolo; because it's a bicycle, not a fishing rod.
M∆SON Definition x Camapgnolo endurance build - ~8.4kg


Last edited by Devon on Thu Jun 13, 2013 3:30 pm, edited 1 time in total.

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PostPosted: Thu Jun 13, 2013 3:25 pm 
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Location: NoVA/DC
Grease between the clamp and frame. Grease bolt threads fully, and under the bolt head. As before, Tacx paste on post to frame.

Sent from my EVO using Tapatalk 4 Beta


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PostPosted: Fri Jun 14, 2013 8:24 am 
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Posts: 568
I have always found that the Masterpiece posts are marginally smaller than the normal posts from Thomson. I wonder if the extra machining takes a small amount from the overall diameter. I know it is not the principle of WW, but if the torque is correct and the clamp ok, I would try another Masterpiece to see if it is a case of upper-lower tolerances, and then think about a non-Masterpiece. The weight savings are modest compared to having a robust seat fitting.


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PostPosted: Fri Jun 14, 2013 11:20 am 
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Location: Surrey UK
If the Masterpiece is not robust, nothing is robust :wink:

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Posted: Fri Jun 14, 2013 11:20 am 


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PostPosted: Fri Jun 14, 2013 11:25 am 
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Posts: 1325
Location: it's raining, it must be uk
i had a similar problem with my ax europa post

6Nm, maximum rated torque - wrench checked against calibrated one at work
clamping bolt/nut threads clean and lubed
inside of seat tube degreased
the post is a tight fit

tacx paste didn't solve it - pink paste

finish line paste didn't solve it - white paste with gritty feel

but a mix of the two pastes did, at 6Nm the post no longer slips, been ok with this method for 3 years now

have to reapply paste mix any time i remove/refit the post, i.e. after boxing the bike for travel, otherwise it will slip without fail


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