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Just put a cargo Seatpost into a carbon frame , size are right. It's tight, but with carbon paste on so tight I had to wipe all the grains off to get it in.
Is this OK, it won't seize?
What's the frame made of?
I had an alloy post seize in a carbon frame many years ago now and after cutting it out I contacted the manufacturer for advice. (This was in the days before we were ripped off for carbon paste by cynical folk) They recommended Hylomar; a non setting gasket compound available from all good motor stores and I've used it ever since. I've also used grease on carbon posts and in carbon frames and not died.
Is it a used frame? sometimes you can get a build up of dried carbon paste gunk inside the seat tube, a good scrub with some kitchen cleaner and a pan scrubber inside the seat tube might work,
Yes. A carbon frame - new, 3 rides old - from which an alloy Seatpost was remove. The carbon post was in a Ti frame and came out easily and I cleaned the post after removal. I literally spread on carbon paste but couldn't get the post on the newer carbon frame until wiping the carbon paste off again.
I had this on a carbon frame a few years ago. The seat tube was sealed at the bottom and the paste caused an airlock. Try taking both bottle cage bolts out and try again.
Then it might be time for the verniers.
Well I popped out and have it a tug. It was quite hard to get out without twisting and I've just read the stuck seat post thread. Think I'll invest in a lighter Alu post.
Not all posts are equal. My USE carbon post was very tight in my Curtis, all others were just on the snug side of normal.
I'm very pleased with my scandium KCNC Ti Pro with carbon rail kit for my alloy railed saddle. 170g for 400mm and the carbon rail kit helps spread the load on the saddle rails. You can get it with the kit already installed (so you don't have to buy it additionally) from Bike24.
Run a rotary wire tube brush down the tube or get your LBS to run a reamer down if its still a tight fit. Bare carbon can sometimes react/swell with certain solvents too.
Could simply be manufacturing tolerances stacking up the wrong way.