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Is a 27.2 CF seatpost safe?

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Moroney167

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Discussion starter · #1 ·
Got my Carve Pro SS rode it a lot all last year and LOVE IT. Singlespeed life has finally caught up to the rest of my friends so its time to start building mine up more. Bought from LBS cool guys and they built with pretty good stuff I say. I'm looking to drop weight and make this thing serious torture now.

I have:
Niner carbon bars
Fox 100mm fork
American classic terrain wheels tubeless
Captain tires (2.2f / 2.0r)
SLX brakes
32/19 gears going 18 when I get back to strength
WTV Pure V seat on basic seat post

Ordering this weeks:
Niner Carbon fork (pumped for this weight drop an ride)
Better ergonomic grips for the 20+ Mile days we jam in woods
More race type seat than big cushion one love it but I want a specialized phenom expert as my Epic has. I'm standing most time anyway!
More light and faster tires, my captains are a bit aggressive I am thinking more back to my s-works tires or similar lower tread

Also seat post. Ill order a carbon Niner one but keep hearing some horror stories of 27.2 being to small and a risk. If they make it why would it be than! I'm 5'8" 165 lbs when back to weight and a very smooth rider. Live in a rooty and small bit of rock area and on my SS again I'm barely sitting besides main trails or climbs. Can I rest at ease and just get myself the post and be done? Bikes at 22lbs right now without my crank bro 3 eggbeaters. So ditching this massive fork, seat post, heavy seat, and going lighter less roll resistant tires I think ill be sitting damn pretty under 20 lbs! Tha is for reading my novel sorry I'm excited. Thanks for input mainly on seatpost ill be sure to show before and after rig and weights
 
#2 ·
Ericksen ti sweet post > everything else.
It's light, blingy, and the ride quality is awesome. Definitely look at the ericksen.

The ericksen ti post and slr saddle saved me nearly 1/2 pound from the thomson post and wtb saddle it replaced.
 
#4 ·
I've got 50 pounds on you and have been rocking a 27.2 niner carbon for a while.

I've had zero issues strength and would buy it again without hesitation.
 
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#5 ·
There is a video on pinkbike at the Santa Cruz factory and they snap an alu frame and then do the same with a carbon frame. The carbon one takes around twice the force to break it.

If the width was really an issue, 9er wouldn't sell them due to the liability.

It'll be fine.
Sent from my HTC6990LVW using Board Express
 
#7 ·
mbco1975 said:
There is a video on pinkbike at the Santa Cruz factory and they snap an alu frame and then do the same with a carbon frame. The carbon one takes around twice the force to break it.

If the width was really an issue, 9er wouldn't sell them due to the liability.

It'll be fine.
Sent from my HTC6990LVW using Board Express
Click to expand...
that is so apples and oranges. a carbon seatpost that has a round cross section is totally different than frame tubes
 
#9 ·
I have had several bikes with 27.2 posts and I've never broken one, and I don't personally know anyone who has broken a post regardless of size or material. As long as you've got it inserted past the minimum mark and you're not jumping from bigger drops at full saddle height I don't think it will ever be an issue.
 
#10 ·
I have a 27.2 / 400 Easton carbon Haven, it is an "all mountain" spec. carbon post (not a weight weenie design, although still light weight) on my Luditte....and love it. I weigh around 215lbs. And have had no issues or worries. It has a lot of flex and seems very well made.
 
Discussion starter · #15 ·
dubthang said:
2.2 may be big enough if your trails are mostly flow, but I ride bigger here in New England. Current setup is a 2.35 on a Velocity Blunt. I have a set of Velocity P35's in the works too.
Click to expand...
Cool I planned going to a newer faster tire. Ill have to see what I can get that's a little fatter. Can't see it being to much added roll resistance. Ill deff be sticking to 2.0 or so for my rear.

I go tubeless and am still dropping air slowly to find a pressure I like best. Down to 30 now and going to go ride that see how it goes
 
#17 ·
mbco1975 said:
There is a video on pinkbike at the Santa Cruz factory and they snap an alu frame and then do the same with a carbon frame. The carbon one takes around twice the force to break it.

If the width was really an issue, 9er wouldn't sell them due to the liability.

It'll be fine.
Sent from my HTC6990LVW using Board Express
Click to expand...
I'm not sure what that video is supposed to prove anyway, that their own manufactured alu frames sucks ass?? It doens't prove jack chit to be honest.

carbon is about as strong as good weldable 7000 series alu, and thats it pretty much. Carbon is prone to lots of manufacturing defects, its no wonder material at all. you can blow bubbles out of alu since the melting temp is very low, but with ti and steel this takes significantly higher temps (double the temp=quadruople the energy wasted) and because the bike industry as a whiole are cheapasses we are very unlikely to see exotic stuff like this with sufficient quality metals such as steel and titanium. The real and only strenght of carbon is the ability to make non round profiles and use a variable thickness whereever you want.

i just love these "is my frame cracked threads" lol, carbon has like ZERO resale value, for a good reason, because we all know deep down its just a piece of shitty brittle plastic.
 
#20 ·
ever notice how carbon seatposts are not really that much lighter than alu ones?? Yeah you guessed it, because its infact just as strong. ta-da, end of magic show...
 
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