bartsav

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.

Fentuz

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

bartsav

Carbon and titanium are much more „elastic” than alloy and having long post it absorbs a lot.

bartsav

Carbon and titanium are much more „elastic” than alloy and having long post it absorbs a lot.

linberl

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.

Fentuz

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

pinholecam

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.

Jipe

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.

ttakata73

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.

dukeiii

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.

50PlusCycling

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.

bartsav

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.