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The ROK Tire was obtainable in Season 26: "Jungle Adventure" by being in the top 2% when the season ended.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
ROK's current MU count is at ~141, which is similar to most other rare items (such as RedS3 or Live2020), and even lower than some rare items (such as Star Wing which is at ~206), despite ROK being at uncommon.