The Solano is compatible with Centaur carbon/Veloce/Mirage compact Ultra-Torque cranks. CNC machined. The 5th arm is slightly offset for crank fixing. The 5th bolt hole has no recess for a bolt head as this bolts straight into back of crank.**TAX inners: all Compact Ultra/Power-Torque cranks****TAY outers: Carbon Compact square taper and Record carbon/Chorus carbon/Centaur alloy compact Ultra/Power-Torque cranks****TAW outers: Centaur carbon/Veloce/Mirage compact Ultra/Power-Torque cranks*** Material : 7075 T6 Aluminium* Outers : 46, 48, 50, 52, 53T* Inners : 34, 36, 38, 39, 42T* PCD : 110 pcd Campagnolo offset arm* Colours : Black * Weight : 74g (48T)