The SRAM 1190 R2C Carbon TT 11 Speed Shifter Set is compatible with SRAM 11 speed road front & road rear derailleur's & SRAM 11 speed cassettes. R2C means return to centre, after each shift, lever returns to the same position. The '' Centre'' position has 40 degrees of adjustment to help optimise aerodynamics. Exact Actuation cable pull is only compatible with SRAM road derailleur's. Aluminium housing with internal, conical expander mounting system.