For tapered 62mm / 72mm OD head tube, to suit1-1/8 to 1.8 tapered fork.

SPECIFICATIONS

HEADSET TYPE: Zero Stack Upper/Zero Stack Lower Cup
STEERER TUBE: Tapered 11/8″ to 1.8″
MATERIAL: Alloy
STACK HEIGHT: 11.2mm (8.8mm + 2.4mm)
UPPER CUP: 56mm Flush Cup
LOWER CUP: 66mm Flush Cup
UPPER BEARING: 36 x 45 11/8″ ACB Sealed Bearing 51.8mm OD
LOWER BEARING: 36 x 45 1.5″ ACB Sealed Bearing 61.9mm OD
WEIGHT: 139.1 grams