Product Description The ZeroStack design uses very low profile aluminum cups that "hide" down in the head tube of the bicycle's frame. Precision CNC-machined aluminum cups, smooth stainless steel cartridge bearing provide long lasting durability. Stack height: 11mm (1"), 13mm (1 1/8"). Wt: 107g (1"), 117g (1 1/8"). Black (BLK).
Note: The ZeroStack cups are compatible only with specifically machined head tubes and cannot be retrofitted to an existing bike with traditional headset cups. This new headset innovation is limited to ZeroStack-equipped bikes.
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