Full speed ahead Gravity DX ZS44/28.6|EC49/30 Headset

For tapered 50mm/57mm OD head tube. For 1.5` headtube and 1-1/8` steerer. 1-1/8 alloy internal cup with 36°/45° ACB sealed bearing upper. 1.5 cromo external cup with caged ball bearing lower. 188g