A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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A protective head covering worn cyclists.
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The part of the brake that absorbs the friction during the braking action.
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Kid trailers, cargo trailers, pet trailers, anything you pull behind your bike. Could also mean an Xtracycle or similar tag-along bike.
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Questions that specifically deal with SRAM components. (No need to use if SRAM is an incidental part of the question.)
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Building a bike starting with a frame and adding components to it. If you're starting with tubes that's "framebuilding".
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a basket, bag, box, or similar container, carried in pairs either slung over the back of a beast of burden, or attached to the sides of a bicycle or motorcycle. The…
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designed to fold or collapse.
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Related specifically to bicycling in the United Kingdom.
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Deprecated. Don't use this tag. Instead use tags for the continent, country, area within a larger country and/or major city as appropriate. E.g. "europe italy" or "us new-york".
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an acronym for "Do It Yourself". Questions here are resources for enthusiastic amateurs working on their own bicycles.
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The procedure to align the wheel by tightening and/or loosening the spokes