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well, i have a 50t shimano dura ace "zen" olymimpic chainring in very good conditions here that i'm willing too sell. "here" is berlin though. if you're seriously interested, let me know.
and yes they are very nice. they dont come with the njs stamp, even though dura ace, because from what i heard they where only manufactured for uci world cup rides/ riders. no free selling.
thanx, 220mm is unfortunately not enough...