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Depends on the type. Quill-type stems have an expander bolt pointing towards the fork which regulates height and alignment, then there's a pinch bolt which holds the handle bar in place.

Aheadset type stems have pinch bolts at the back which locks them to the steerer tube and faceplate bolts at the front which holds the handle bar in place. Then there's a top cap that's used to set headset bearing preload.

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13y ago
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13y ago

No way of telling straight off. check out for repair tips.

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Q: How do you tighten a stem on a bike?
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