High-quality, CNC'd alloy track chainrings from our popular Black Label component series. Chainrings are 144BCD, available in silver or black, in 46t, 48t, 49t, and 52t. [FEATURES] TOOTH COUNT: 46, 48, 49, 52 CHAINRING BCD: 144 Designed to work with any 144 BCD crankset Risk-Free Purchase - State Bicycle Co. offers FREE EXCHANGES* -If this item doesn't work out, we'll send you a return label and exchange for free!