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Clyde Seatpost woes, sliding down...

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Clyde Seatpost woes, sliding down...

Old 01-25-21, 09:54 PM
  #26  
tallbikeman
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A couple more thoughts to add to the pile. Check for microscopic cracks in the seatpost tube and the carbon seatpost. Carbon is a matrix of resin and carbon fiber. The resin is either epoxy resin or something similar. It has very low strength. It is easy to damage carbon parts with tightening practices for steel or aluminum parts. I've read that carbon parts have much different (usually lower) torque specifications than steel or aluminum. If the carbon seatpost has delaminated inside due to high compression from the seat post clamp it might just be bending inward and thus slipping. Interested to hear of a fix for this problem. If you have this same problem with an aluminum post then I would check that frame for cracks. I ride two steel frames with almost identical seatpost clamps and aluminum posts. They are solid. I weigh 250lbs and sit fairly upright.
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Old 01-26-21, 07:52 AM
  #27  
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Does the seat tube have bosses for a bottle cage? I can't tell from the pictures. If so, get a bolt for the top bottle boss that is long enough that it extends into the seat tube far enough to act as a stop for the seatpost. Get a seatpost that is long enough to make contact with the bolt when it is installed. Between that and the seatpost clamp, the post will no longer slide. If there are no bottle cage bosses on the seat tube, find a local framebulder/repair shop to install one somewhere on the seat tube for this purpose.
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Old 03-26-21, 05:58 AM
  #28  
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Someone pointed me to your thread, I have a 2019 Jamis Renegade Escapade and first had the seat post slipping, then had the carbon seat post go kerplooey - see my post here.

I'm a 225 lb Clydesdale, but all my miles on that bike have been lightly loaded road touring or rail trail/tow path riding - very little gravel, no single track. I love that bike but not that seat post - I much prefer the alloy one the bike shop put in temporarily until Jamis sends a replacement carbon one. When the carbon one slipped, I didn't notice at first and the lower position caused my chubby things to rub the annoying square edged seat clamp on that carbon post, wearing holes in my best cycling shorts!
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Old 03-26-21, 06:28 AM
  #29  
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I would use a metal seat post. Then put another clamp around the seat post, just above the existing one. If it still slips, you could have 2, 3 or 4 clamps one on top of the other.
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Old 03-29-21, 12:07 AM
  #30  
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Originally Posted by jpescatore View Post
Someone pointed me to your thread, I have a 2019 Jamis Renegade Escapade and first had the seat post slipping, then had the carbon seat post go kerplooey - see my post here.

I'm a 225 lb Clydesdale, but all my miles on that bike have been lightly loaded road touring or rail trail/tow path riding - very little gravel, no single track. I love that bike but not that seat post - I much prefer the alloy one the bike shop put in temporarily until Jamis sends a replacement carbon one. When the carbon one slipped, I didn't notice at first and the lower position caused my chubby things to rub the annoying square edged seat clamp on that carbon post, wearing holes in my best cycling shorts!
Glad you didn't get hurt. Hope you find a satisfactory answer to your seatpost issues.
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Old 03-29-21, 07:15 PM
  #31  
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I also had the trouble of a sliding seat post. My solution was to switch from a bolt down clamp to a quick release one. For some reason that worked out much better for me.
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Old 04-02-21, 07:09 PM
  #32  
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Originally Posted by blue192 View Post
I also had the trouble of a sliding seat post. My solution was to switch from a bolt down clamp to a quick release one. For some reason that worked out much better for me.
I just ordered one, thanks for the idea.

I also put a new bolt in my Salsa collar on my Fargo. The internal hex head was starting to round from over-tourqing it. I’m going to get a stronger bolt (non stainless steel) for my Salsa Fargo clamp from the hardware store. I might even find an external hex head which will make for better torque ability using a crescent wrench.

appropriate GIF I found


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Old 05-03-21, 07:22 AM
  #33  
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Update:

I added a hose clamp above the seat post clamp. I still need to (over) tighten for the system to work, but it has been working. My Whiskey post is getting a little bit chewed up and will need to eventually be replaced with a metal one.

im concluding the Jamis integrated seat post clamp is just an inferior design for us Clydesdales. Define weak point on an otherwise great bike. I’ll be sharing this post with Jamis.





I also had some post sliding on my Salsa Fargo. But the quick adjustment lever clamp solved that. Note it’s also an aluminum seat post.
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Old 05-03-21, 09:16 AM
  #34  
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Sometimes the simplest solutions are the best. Even though not elegant, the hose clamp should do the trick.
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