Does the top cap bolt just hold the top cap on, or does it have another function?
It applies pre-load to the head-set bearings. Once the clamp bolts on the stem have been tightened, you can throw away the bolt and the top cap.
Once the clamp bolts on the stem have been tightened, you can throw away the bolt and the top cap.
Or not.
@JurekB started
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Does the top cap bolt just hold the top cap on, or does it have another function?