Sunrace R80 Downtube Shifters8speedBraze or Clamp onSLR632:1 Actuation RatioSpeeds: (R) Index 8 (L) Friction 3/2Mounting: (B) Brazed On Type 28.6mm / (C) Brazed On Type 44mm / (F) Brazed On Type 50mmMounting: (H) 22.2mm Clamp / (G) Handle Bar Stem 25.4mm Clamp / (D) Downtube 28.6mmCable Type: Slick GalvanizedCasing Compatibility: (R) SP / (L) 2SP & ?Average Weight: (D) 119g / (G) (H) 134g