FSA K-Force 386 Super MTB Inner Chainring: Genuine replacement chainring made from precision CNC machined A7075/T6. Precision CNC machined A7075/T6 Outer ring threaded for chainring bolt only (no nut required) Shifting ramps & stainless steel pins for outer & middle rings Black anodised with CNC details Colour graphics & laser etched logos Available in Shimano 10 speed (M10) or SRAM 10 speed (X10) BCD: 86mm