pic for illustrative purpose - item is ZeroStack 56mm to 1-1/8" Crown Race Technical Description ZS/56/30/H4/K Bottom Type ZS - ZeroStack Bottom Head Tube Inside Diameter 55.95mm Crown Race Seat Diameter 30.015mm Crown Race Type Steel, Face-Sealed Bottom Stack Height 4mm Bottom Bearing Type Black Oxide, Sealed Material 6061 Weight 88g Part Number BAA0089K 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 Covers Tall and short aluminum and carbon covers offered on many IS and ZS models Interlok® Interlok® spacer compatible Compatibility Internal parts are cross-compatible across the 10, 40 and 110-series Stack Heights Consistent top and bottom stack heights across 10, 40 and 110-series Traditional – 16mm top, 12mm bottom ZeroStack™ – 8mm or 15mm top, 4mm bottom Integrated – 9mm or 15mm top, 1mm bottom available fits: complete IS38 – IS38 9mm Cover (Integrated 1” Standard) IS38 – IS38 15mm Cover (Integrated 1” Standard) IS41 – IS41 9mm Cover (Integrated 1-1/8” Standard) IS41 – IS41 15mm Cover (Integrated 1-1/8” Standard) IS41 – IS41 9mm Carbon Cover (Integrated 1-1/8” Standard) IS41 – IS41 15mm Carbon Cover (Integrated 1-1/8” Standard) IS42 – IS42 9mm Cover (Integrated 1-1/8” Italian Standard) IS42 – IS42 15mm Cover (Integrated 1-1/8” Italian Standard) IS42 – IS42 9mm Carbon Cover (Integrated 1-1/8” Italian Standard) IS42 – IS42 15mm Carbon Cover (Integrated 1-1/8” Italian Standard) ZS44– ZS44 8mm Cover (ZeroStack™ 1-1/8” Standard) ZS44– ZS44 15mm Cover (ZeroStack™ 1-1/8” Standard) ZS44– ZS44 8mm Carbon Cover (ZeroStack™ 1-1/8” Standard) ZS44– ZS44 15mm Carbon Cover (ZeroStack™ 1-1/8” Standard) ZS49– ZS49 Conversion (ZeroStack™ Cup for 1-1/8” Steerer-Tubes – Adapted to 1.5” Traditional Standard Head-Tube) TR30– TR30 (Traditional 1” Standard) TR34– TR34 (Traditional 1-1/8” Standard) TR49– TR49 (Traditional 1.5” Standard) ZS49– TR49/30 Conversion (Conversion assembly to adapt 1.5” Traditional head-tube to a 1-1/8” steerer tube. Uses a ZeroStack™ Top Assembly and a Traditional Bottom Assembly.
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