Carbon seat posts that 'flex'
I use a 27.2 carbon Profile layback post (STW classified bargin!) on my road bike and it’s a hell of a lot more comfy than any aluminium alternatives I’ve perched on. I think the layback adds a bit of leverage, a riding buddy said he’s seen it flex when I’ve been unleashing the weasel on the flat 😯
Make sure you don’t get a ‘carbon wrapped’ if you go carbon rather than ti.Posted 4 years agoMacavityMember
A comfy saddle can be a good idea.
And fatter tyres can help.Posted 4 years ago
Apparently 20mm of movement.Posted 4 years agorocketmanMember
Have got Race Face and Easton carbon seatposts on two bikes 31.6 they don’t flex. Also some old 31.6 Syncros/USE/Pro Lite posts in a box they don’t flex either.
The only time I ever noticed any flex was when using a 27.2 Thomson post with a 31.6 shim. That was bad flex I could feel it moving with every push of the pedals awfulPosted 4 years agoshedbrewedMember
I would have thought the more seat post you have proud of the seat tube the more flex you are going to obtain.
Likewise the smaller diameter the post itself will give more flex.
Also the thickness of the wall and material itself?
Looking at the bikes/spares I have there are 3 carbon posts none of which were more than £25- a 27.2mm Bontrager Race X-lite copy that takes road buzz out but doesn’t flex much.
A 31.6mm Ribble/CSN that’s stiff as can be.
The most flexy is a Token fibreglass/carbon post in 27.2mm.
Non-carbon I’ve an I-beam that’s very comfy with an alloy post, and a ti van nich post on the road bike that’s quite stiff.Posted 4 years agolovewookieMember
that ergon one, I can see how it flexes, sorta, but the post is split, meaning to adjust saddle nose/tail position you undo the seat QR and adjust. does this then mean that when done up the two halves are trying to move against each other as they flex? and that in reality you’ve only got half the post against the inside of the frame and the ‘inside’ bit on a slip plane?
this makes me nervous.
nice concept though.Posted 4 years agojulianwilsonMember
How much seatpost will you have showing OP?Posted 4 years ago
I have a 27.2 post which at 350mm and about 220mm of actual carbon shaft showing means you can see it flex a tiny bit just sitting on the bike. However: steel bike, curvy seatstays and 2.1″ tyres at 40psi probably make more of a difference than flex in post.
Wife has a 31.6mm post on her road bike with about 100mm showing, I reckon that makes a whole heap less difference to hers!bonchanceMember
I also had an ec70 on a uber-stiff CAAD4
Only reason I kept riding that bike!
I also read somewhere that the ‘floppiness’ increases with time. With hockey sticks (Easton’s other big play) it’s a preferred characteristic, but does mean they are at the end of life..(!)Posted 4 years ago
The topic ‘Carbon seat posts that 'flex'’ is closed to new replies.