Go Back  Bike Forums > Bike Forums > Folding Bikes
Reload this Page >

Carbon or Ti seatpost for Dahon

Notices
Folding Bikes Discuss the unique features and issues of folding bikes. Also a great place to learn what folding bike will work best for your needs.

Carbon or Ti seatpost for Dahon

Old 05-14-20, 08:59 AM
  #1  
bartsav
Junior Member
Thread Starter
 
Join Date: Oct 2018
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked 0 Times in 0 Posts
Carbon or Ti seatpost for Dahon

I ride P18 Dahon and I am thinking of some comfort upgrade by changing alloy setpost to carbon or titanium one. I would prefer Ti for less posdibility of cracking but cannot find any. There are only for Bromptons. I could use the adapter but wonder if it works and is worth the effort. I also wander if a carbon seatpost won’t brake. Does anyone did this before and can share expetience.
bartsav is offline  
Old 05-14-20, 09:26 AM
  #2  
Fentuz
Senior Member
 
Join Date: Aug 2014
Posts: 61

Bikes: Dahon jetstream p8 & customized helios

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 15 Times in 14 Posts
Why would carbon or Titanium add comfort? For confort, I fitted the cane creek saddle post but they became rare in 33.9mmOD.
There are those : https://foldingbike.biz/epages/7665e...POSTBLA%5B1%5D
https://foldingbike.biz/epages/7665e...OSUSSEATPOSBLA
Fentuz is offline  
Old 05-14-20, 09:44 AM
  #3  
bartsav
Junior Member
Thread Starter
 
Join Date: Oct 2018
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked 0 Times in 0 Posts
Carbon and titanium are much more „elastic” than alloy and having long post it absorbs a lot.
bartsav is offline  
Old 05-14-20, 12:09 PM
  #4  
bartsav
Junior Member
Thread Starter
 
Join Date: Oct 2018
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked 0 Times in 0 Posts
Carbon and titanium are much more „elastic” than alloy and having long post it absorbs a lot.
bartsav is offline  
Old 05-14-20, 12:57 PM
  #5  
linberl
Senior Member
 
linberl's Avatar
 
Join Date: Jun 2014
Location: SF Bay Area
Posts: 2,830

Bikes: 2017 Bike Friday PakiT. Dahon Mu Uno (trailer bike) Sold: 2003 Bike Friday NWT, 1997 Trek 720, 1993 Trek 520)

Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1096 Post(s)
Liked 90 Times in 78 Posts
I have a titanium seat post on my Bike Friday. What you might be able to do is just get a titanium tube with the proper circumference and clamp it on. Then get a seat post (with saddle clamps) that fits inside the diameter of the titanium tube. That's how it works on my bike friday - it's a long titanium tube with a Thompson seatpost inserted and clamped in place. It defintely adds some absorption but also adds a bit of flex.

linberl is offline  
Likes For linberl:
Old 05-14-20, 02:48 PM
  #6  
Fentuz
Senior Member
 
Join Date: Aug 2014
Posts: 61

Bikes: Dahon jetstream p8 & customized helios

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 20 Post(s)
Likes: 0
Liked 15 Times in 14 Posts
Originally Posted by bartsav View Post
Carbon and titanium are much more „elastic” than alloy and having long post it absorbs a lot.
carbon, well, it depends of the quality of the mesh and the bonding agent. Hobby product such as bike and golf are not the top range and it does cost. In event of failure, you end up with whiskers everywhere-lovely in a wound.

Titanium, unless you go TixAlyVz ELI again you can get fatigue failure...

point being yes in theory you can use these type of products but unless you use a aerospace/medical grade which cost a lot, you might not get a great result.

suspension post are cost effective
Fentuz is offline  
Likes For Fentuz:
Old 05-14-20, 07:09 PM
  #7  
pinholecam
Senior Member
 
Join Date: Jan 2016
Posts: 409
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 139 Post(s)
Liked 30 Times in 29 Posts
If you can live with a weight increase, a suspension seatpost is the best.
I have a Suntour one on my folding gravel bike and its the biggest difference in ride quality I've ever experienced.
It also helps with stability on bumpy ground.

A sprung saddle works rather well and I'd put it after the suspension seatpost for comfort.
Again, its a heavier option that the Ti and Carbon seatpost.

I have a very long Ti seatpost on my Bike Friday Super Pro.
With that sort of length, I can't imagine it being carbon with a heavy rider.
I can probably get away with it being carbon, but I really don't think its for heavy riders.


Carbon will be the best if factoring weight and comfort.
But diameter of the seatpost also plays a part.
Do get a good quality one to avoid problems.
pinholecam is offline  
Likes For pinholecam:
Old 05-15-20, 02:51 AM
  #8  
Jipe
Senior Member
 
Join Date: Feb 2017
Posts: 284
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 154 Post(s)
Likes: 0
Liked 17 Times in 15 Posts
Carbon seatpost isn't a good idea on a folder for two reasons:
- carbon easily scratches and on folder you need to push the seatpost down each time the bike is folded. Dirt from the ride will then scratch the seatpost.
- carbon doesn't like compression-decompression cycles and this is what happen each time the bike is folded and unfolded.
Jipe is offline  
Old 05-15-20, 09:20 PM
  #9  
ttakata73
Senior Member
 
Join Date: Feb 2012
Location: Bangkok: hottest average temperature :(
Posts: 621

Bikes: 1998 GT Forte Ti 700c, Totem KDS-D 26" fatbike, Cannondale Hooligan1 20", BirdyGT 18", Brompton M2LX 16", Dahon Dove 14"

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 87 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Avoid carbon. I had one for my Dahon Dove and could never get it to stop spinning with a plastic or aluminum shim. I heard the carbon crack too so switched to aluminum. I have a ti post on my Brompton and no problems. Metals can handle compression better. Carbon is only good on posts that don't get adjusted and even then need double bolt clamps to keep from slipping.
ttakata73 is offline  
Old 05-16-20, 12:24 AM
  #10  
dukeiii
Junior Member
 
Join Date: Apr 2020
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Likes: 0
Liked 3 Times in 2 Posts
If you need to fold and unfold frequently and hate scratch marks, avoid carbon. I've been using carbon seat posts on folders for more than 10 years. They're much stronger than expected. Slipping could be an issue, plastic shim, stronger clamp or some fiber grip compound could stop it. Ti post are relatively easy to find here in China, quality one comes around USD100.
dukeiii is offline  
Likes For dukeiii:
Old 05-16-20, 01:33 AM
  #11  
50PlusCycling
Senior Member
 
50PlusCycling's Avatar
 
Join Date: Mar 2018
Posts: 282
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 120 Post(s)
Likes: 0
Liked 25 Times in 21 Posts
Having come across more than one permanently bonded carbon/aluminum bike and seat post combinations, I would use titanium. The only sport I prefer carbon fiber over metal is archery, the best arrows are made of carbon fiber.
50PlusCycling is offline  
Old 05-16-20, 04:09 PM
  #12  
bartsav
Junior Member
Thread Starter
 
Join Date: Oct 2018
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Liked 0 Times in 0 Posts
My thinking was like that however I wanted to see if I was tight. I tried to find a Ti seatpost in 33,9 diameter but I was able to find only Brompton size.
bartsav is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.