Absolute Black 104/64BCD Oval Chainring. Features: Oval rings help the rider spin smoother and generate more power Example: 32t is equivalent to 30t at deadspot and 34t at the power zone Narrow-wide tooth profile keeps the chain snug, allowing you to leave the chain guide behind Fits 104/64 BCD 2X crankset and converts into single ring Works with 1x10/11/12sp or Singlespeed setups Designed in UK, manufactured in Poland 32t chainring (AI-4070 through 4072) has built in 2mm spacers and threaded holes. Use 6mm long minimum bolts to thread directly in to the chainring 30t chainring includes (2) M8 T30 aluminum torx bolts, (2) M5 T25 steel torx bolts and (2) eccentric spacers to fit 104 BCD spider Specs: Ring Type:single (anti chain drop) Armx BCD:4x64mm Teeth:26t Color:black