I have an extralite ultrastar and tune top cap laying arround. I know this combo saves a bit of weight over a more conventional expander plug, but is it worth it to remove the starnut from my fox fork and use the extralite instead? Any decent weight to be saved that way?

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2013 rocky mountain vertex 29er
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As I remember a typical starnut weights in 9-12g range so no weight savings here.

Like you stated Ultrastar will save a lot over a typical expander for carbon steerers, but on aluminum steerers it is not much.

Chris.

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MSC Koncept Carbon Di2 - 6955g
Leichtkraft Team Carbon - 6868g.