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n00bsauce
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Yeah, cables do "stretch". Brakes and derailleurs often need a readjustment after a period of riding when new cables are installed. The individual strands don't actually elongate but the twisted strands do twist together just a little bit tighter and effectively elongate the cable.

edit: better cables that are "pre-stretched" won't elongate much at all. Probably not enough to require adjustment unless, like you mentioned, they aren't fully seated.
 
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