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was told today by my LBS that a carbon seatpost in 27.2 was'nt a could idea due to possible failure , is this true as I thought it would flex abit for my hardtail ?
Please, pleeeeease tell us who your LBS is
ignore them unless you are doing crazy jumps. I am 14st and have a fairly long carbon post on my bike, and two kids to prove that (so far) no damage!!).
I thought so lol I had my wallet out to buy one but got turned away do they flex that much ? whats a good one ???
what tosh.
yes they have a bit more flex, but do gain strength from generally having a slightly thicker wall thickness.
I like 27.2 due to the flex, but you're just as likely to snap an ally one.
The bike industry seem to be the only people left in the world who think Ally is stronger/safer than carbon
I didnt like the flex so swapped for a Thomson. Never crossed my mind that it would fail. Work in engineering so can appreciate how strong the stuff is. I dont think I'd ever ride an alloy rigid fork, have given carbon forks some good hammering but wouldnt feel safe on a rigid alloy.
The flex is the best bit about a good carbon (or Ti) post. It really takes the buzz out of the trail, much comfier on a hardtail. I don't have ANY Aluminium posts on my bikes appart from a Thomson on my FS.
had a 27.2mm carbon Kore IBeam post on both my HT and Full suss for 18 months with no issues. On the HT its almost ran at full height (and its a 400mm post)
As soon as I've got the cash I'm getting a carbon post for the commuter, alu one is a bit harsh
I'm still waiting to hear which LBS this was 🙂
also run a 26.6mm carbon post on commuter x bike with no issues - that does go offroad
takisawa2 - Member
I didnt like the flex so swapped for a Thomson. Never crossed my mind that it would fail. Work in engineering so can appreciate how strong the stuff is. I dont think I'd ever ride an alloy rigid fork, have given carbon forks some good hammering but wouldnt feel safe on a rigid alloy.
what's the difference between forks and seatposts that makes this decision for you?
i have snapped two carbon posts and have never snapped a alloy one yet.When they let go there is a pretty loud crack
Rigid alloy forks are fine on my crosser
Carbon fibre (the high modulus stuff at least) is stiffer than steel, aluminium and titanium. Carbon Fibre Reinforced Plastic CFRP
http://aluminium.matter.org.uk/content/html/eng/default.asp?catid=89&pageid=2144417038