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AFAIK the general consensus is that carbon < alloy particularly in the wet. Certainty in my experience. That said, given that plenty of people (choppers like me and full-time pros) seem to manage just fine so that's not really the main issue.
I have some nice alloy race wheels now, and want to be able to pick and choose which wheelset I use with ease, plus have the ability to use both sets in a race if I flat
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The alloy rims I ride on (Kinlin, Pacenti, DT Swiss e.t.c) and my carbon rims with the right pads are as about as good as each other wet or dry. I think rim brakes are rubbish in the wet regardless of the rim brake or pad. You can fiddle to make the differece rubbish and really rubbish. this is why disc brakes exsist. When its proper wet the water has to be scrubbed of first before there is any bite.
I race on carbon wheels when it proper wet and have no more trouble than on alloy rims in the same conditions. I just avoid braking when it is wet.
carbon wet braking is very rim/pad dependent.
user20714
cycleclinic
why alloy carbon though. Good carbon rims with the right pads brake very well. I know mine work as well as all the alloy rims I have with good pads with the same brakes in both wet and dry. if you go with tubulars you do not overheating issues unless you are really determined.