UST란 뭘까? 광고 듣고 다시오겠습니다. (배철수 버전) " UST stands for Universal Standard Tubeless, and it refers to a very specific, two-part system consisting of the rim and the tire. The UST system was developed and introduced in 1999 as a partnership between Mavic, Michelin, and Hutchinson. On the rim side, Mavic contributed technical expertise as to the rim shape and keeping the tire bed airtight. On the tire s..