Thats bonkers light. Hadn't heard of BDOP before. The machining looks similar to srams one-piece x-dome steel cassette clusters.
Just out of curiosity, what sort of mileage would be expected from the cassette? I know yours is on a hill climb bike so wont exactly be doing 200 miles per week, but how many miles could you expect with regular use?
I know, a pretty decent saving over the DA9100 cassette. The YT link from the seller states 5000km without any noticeable increase in wear or noise, in my case with the very little use expected of it (this wheelset is tubular and not worth the risk for full on day rides) it should last indefinitely. I've a couple of pretty steep hills near me that I'm trying to better my times up gradually and it's solely for that use.
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