ABSOLUTE BLACK Oval 64 BCD chainring

AbsoluteBLACK Premium 64bcd Oval traction narrow wide chainrings are designed for any cranks that use 104bcd mounting interface. This is the most common mounting standard for Shimano and other 4 arm cranks. Specifications: - Size (Mass +/-1g): 28T (42g) - Material:cnc machined 7075 Txxx Aluminum. Long-lasting construction. Type II anodizing - Chainline: 26&28T (64bcd) - 46mm ; 30T - 48mm ; 32T - 48.5mm ; 34&36T - 50mm - Mounting holes: 4 x 104mm BCD (for 32T ring, bolts should be min 6mm long) - Ovality: Optimized to each size separately. Range: 10.2-14.4% and Timing of 110.5-116.3° after TDC (top dead center) Patent Pending