Velocity made a rim for a short time. On the inside profile of the rim were square metal 'eyelets' that could slide around the rim in a slot. You could position the eyelets where needed and then spoke tension would presumably hold them in place. It was Velocity's attempt at a tubeless rim, however I never saw one in person and can't find any mention of it on their sites or in the catalog. I think it was called the "Girder?"
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