The standards for headset performance, durability and value are set by the 40-series. Drawing from the Premium 110-Series Design, the 40-Series incorporates all the features necessary for a durable, light-weight, long-lasting headset.. Part Number: BAA0091K. Technical Description: EC49/40/H12/K. Bottom Type: EC – External Cup. Bottom Head Tube Inside Diameter: 49.61mm. Crown Race Seat Diameter: 39.79mm. Crown Race Type: Steel, Face-Sealed. Bottom Stack Height: 12mm. Bottom Bearing Type: Black Oxide, Sealed. Material: AL6061. Weight: 76g
70%
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