Available in 1/8" (freestyle) or 3/32" (race) widths. Flat back, high performance, extra strong. Speed:Single Speed. Pin Width:3/32 - 8.6mm | 1/8 - 9.5mm. (Standard chain is approx 850 Kgf). Slotted outer link with grind friendly 'flat back' and curved inner edge for micro-drive compatibility.