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28mm wide to provide a better platform for wide tires, the M121 is the rim to have when you are running 2.3 or larger tires. 28mm wide (external) 21mm (internal) tire seat. Double stainless steel eyelets, 543mm ERD, pinned and welded rim seam, drilled Schrader, 540g. Specify Drilling 32 or 36 hole.