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. This Outer chainring has 50 teeth and a 5 arm design with 110mm spacing, making it compatible with 9/10 speed gear systems. It can be used as part of a double or triple assembly. Made of aeronautical grade die-cut aluminium alloy 7075 T6, resulting in a both lightweight and rigid chainring. Spacing: ø110mm/5 Arm Position: Outer