* 1-1/8''/1.5'', 36å¡/45å¡ ACB* For tapered 50 mm/62 mm OD head tube* For 1-1/8'' to 1.5'' tapered fork* Upper: Forged alloy cup with ACB (blue seal)* Lower: 1.5'' CNC-machined alloy cup with ACB (black seal)* Stack height: 16.9 mm + 2.9 mm = 19.8 mm* Weight: 124.6 g