Armrest with adapter for height adjustment SPEC: For Ø31.8 handlebar with TUB-S Include adapter 20 / 40 / 60mm OPTION: ALLOY EXTENSION TUBE:TUB-S, TUB-J, TUB-S1, TUB-S2 3K OR UD CARBON EXTENSION TUBE:TUB-S-C, TUB-J-C, TUB-I-C, TUB-S2-C