SHIMANO 105-5603 3x10sp F-derail, 28.6/31.8mm - sil Capacity: 20TClamp: 28.6/31.8mmDerailleur Color: SilverFront Derailleur Clamp: 28.6mm (1-1/8"),31.8mm (1-1/4")Rings: tripleSpeeds: 10sp