- Chainring specially designed to meet the needs of a 1x10 - 1x11 or 1x12 MTB single chainrings. The special narrow/wide tooth shape enables the chain to stay in place without the use of a chain guide * Compatible with either 10x, 11x or 12x derailleurs. * Material : 7075 T6 aluminium * PCD: 104mm 4 Arm * Sizes: 30t, 32t, 34t, 36t, 38t * Colour: Black