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a modern tubeless compatible coated rim would mostly negate that problem right?
Not negate, just delay. Most of the black rims you can buy are soft anodised, that will wear off if you look at it wrong. Full hard anodising (if you could still get it) will last much longer, but will still look beaten up after one winter on wet and dirty roads. Carbide coated will last longer still, but it's expensive and limited to, at best, a couple of rims.
If you're getting beater wheels to save your crabon, just buy some cheap factory wheels (Shimano/Mavic/Fulcrum according to prejudice) or do what every query in the wheelbuilding threads resolves to and build a set of Kinlin XR31s. If you must, get the disc ones and hoover up the Insta likes before you touch them with a brake pad.
My understanding is that's what the Oxic coating is on the DT Swiss, or at least the same sort of idea.
Obviously there isn't much point going to the trouble of sourcing all black wheels if the colour on the brake track is going to wear off after a short while but a modern tubeless compatible coated rim would mostly negate that problem right?
@Skülly Doesn't need to be all black, just not shiny silver. Definitely has to be aluminium and tubeless though, already have a set of carbon wheels, looking to build a set of winter wheels.