Nerius 110mm campagnolo chainring ct 11 speed ta only make their chainrings from the best 7075 t6 heat treated aluminium sheet the teeth are cut in the traditional manner on a lathe which produces a much better and more accurate tooth form than pressing which is used by most chainring manufacturers nerius for campag 11x only can convert some campag carbon 10x chainsets to 11x can be fitted to super record record chorus athena and centaur chainsets weights 34t 29g to 50t 78g