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dadbike
Yeah, I have an ancient shiny cog that’s still going strong but I’ve bought a couple more recently that have had a matte finish that has crackled up and flaked off.
Image below is of a 19t I bought for myself and put a couple hundred miles max on. I emailed them about it and they gave me a partial refund and said that they had had issues with their plater, made it sound like only a small batch would be affected. That was Dec 2020.
I then built a wheel for a customer about 4 months ago and bought a cog to go with it (think it was a 15t or 16t). After maybe 2 months they asked me to rebuild the wheel with a coaster hub and when they sent the wheel back I noticed the cog was the same. It was on a minivelo so doubt it’d seen a very high mileage.
When I contacted them Velosolo did say that it was just cosmetic and the steel underneath wouldn’t be any weaker or anything but I think the bits where the finish has flaked off have corroded quicker and having a cog dump these metal flakes into your chain is far from ideal.