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I've only owned one previous set of rim brake carbon wheels. They were American Classics from about 8ish years ago. I only used them for a few months before going back to alloy rims at the time. They were always sketchy but the last time I used them, I reckon I came pretty close to dying when a speeding car missed me literally by inches. I think alloy rims would have slowed down a lot sooner... I went home and put them up for sale that day.
I went to disc brakes whenever the Caad10 disc came out and haven't used any recent carbon rim brakes but I don't think they have really improved dramatically.I've not looked to see what the seat post is like without the collar on, it'll be interesting to check.
TotalShanner
We have been living parallel lives ! All my r8000 was second hand except the crankset and wheels off another bike so not in too deep. I think if your seat post feels snug you should be ok, mine is baggy to say the least without the seat clamp on. If you did have problems you could always swap out the partial brass one for a full wrap around beer can shim with the top edge rolled out a bit and it would probably sort it. Those wheels look mad, I was under the impression braking had improved on more modern rim brake carbon wheels? But never owned any.