Hot Sale Premium Knock Block Headset Upper

– The top cap on these headsets have unique raised features that key to Knock Block compatible stems (made by Bontrager
– If spacers are needed, you will need to use special Knock Block compatible spacers with notch features
– This product is the upper headset only
– Lower headsets on bikes with Knock Block do not have any unique features. They are usually IS headsets which are available separately

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