Item-1 HB912-T-15 Item-2 HB912-T-51 Stem Size 85-100mm Handlebar size 420mm Spacer high & bolt size Spacer 75mm use 120mm bolt; Spacer 55mm use 100mm bolt; Spacer 35mm use 80mm bolt; Stem angle 0 Rest tube angle 51 angle tube and 15 angle tube available Rest tube length 51 angle tube length 420mm; 15 angle tube length 330mm Rest tube clamp angle 15 angle Stem Steerer hole 28.6mm Di2 Compatible Finish Black matte Material 100% Toray Carbon T700 HMF Cable Outside & internal cable compatible Warranty 2 year Weight 1250-1280g