FSA Hammer 1 1/8" Headset If you're in the market for a new headset the FSA Hammer 1 1/8" Headset is an excellent choice. As the name implies, the hammer is a bombproof, all metal construction that offers reliability and durability. The forged and CNC machined Cro Mo cups and oversized 1/4-inch bearings in the lower cup will not let you down and offer a lightweight design over other materials such as steel or aluminum. Features Cro Mo cups Lightweight durability. EC34 Upper and lower cups. 24. 7mm Top stack height. SPECIFICATIONSTechnical Description EC34/28. 6 (5/32x20) | EC34/30 (3/16x20Top Type EC34Top Head Tube Inside Dia. 1 1/8Stem Clamp Dia. 28. 6 Threadless Top Stack Height24. 7 mm Top Bearing Type Cup and Cone Bottom Type EC34Bottom Head Tube Inside Dia. -Crown Race Seat Dia. 30mm Crown Race Type-Bottom Stack Height-Bottom Bearing Type Cup and Cone Material Cro Mo Weight149 g Manufacturer's Part Number141-2340Cane Creek Headset Finder To figure out which headset you need for your particular frame and fork, see Cane Creek's Headset Finder by clicking HERE. | Fsa | Hammer 1 1/8" Headset | Black | 1 1/8"