Bottom Assembly only SPECIAL IRREGULAR SIZE!!! Technical Description ZS/55/40/H4/K Bottom Type ZS - ZeroStack Crown Race Seat Diameter 39.79mm Crown Race Type Steel, Face-Sealed Bottom Bearing Type Black Oxide, Sealed Material 6061 Part Number BAA0737K The all-new 40-Series is the work-horse of Cane Creek’s headset line-up. The series incorporates all the features necessary for a durable, light-weight, long-lasting headset and represents the perfect balance of performance, durability and value. Precision engineered by Cane Creek in Fletcher, NC. 40-Series Features: Cups and Covers 6061-T6 Aluminum Internally relieved to reduce weight Clip-Seal Innovative Clip-Seal completely seals the top assembly and captures the compression ring to reduce the number of loose parts Face-Seals High-quality, low friction face-seals on the crown races Crown Race Durable steel crown races Bearings Dependable black-oxide, sealed cartridge bearings
