sram XO 2x10 Front derailleur

 sram XO 2x10 Front derailleur

directly mounted 36-38T

Bicycle chainrings are part of the bicycle's transmission system, also known as front derailleur or disc shifter, which controls the chain's movement up and down between the front discs (cranks), to change the transmission ratio to adjust the pedaling force and vehicle speed to suit the terrain.