Cruel Components VoR ultralight mono-ring chainring with synchronized teeth, Aluminium CNC made, compatible with 10-11-12 speed drivetrain (Sram and Shimano both). The "narrow wide" synchronized teeth allows it to work even without the chain guide. The maximum reliability is guaranteed only with rear derailleurs with clutch as SRAM XX1 AXS, XX1 Eagle, XX1, X01 Eagle, X01, X1, GX, X0, X9 Type 2 or Shimano Shadow Plus. 7075T6 Aluminium assure a longer lasting than standard aluminum chainrings. Available in 30T - 32T - 34T - 36T , black, gold or red anodized finish with milled graphics. Compatible with cranks with 4 holes 104 mm BCD spider ( Powermeter SRM and Quarq Sram XX1 Eagle included). Integrated female threaded chainring fixing bolts. 44 gr. weight (34T). 100% Made in Italy.