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I have an old bmx and my chain broke yesterday. I bought a new chain from WalMart. It is 300 links for 1 speed but I don't know what is the bmx speed (gear); it was rusted but I fixed it up. I left my bmx at a program that opens tomorrow but I'm afraid its the wrong chain.

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    Are you asking how to repair the old chain or how to make the new chain work? – BSO rider Aug 16 '15 at 21:13
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    300 links sounds weird. Most chains are around 114-116. – Batman Aug 16 '15 at 22:25
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    Basically you need a "chain breaker" tool and a detailed tutorial. As to the right/wrong chain, basically the width of the chain is the only critical parameter. There is one width for most single-speed bikes, then several different widths for multi-speed derailleur-style bikes, depending on how many speeds and what "generation" the bike is. – Daniel R Hicks Aug 16 '15 at 22:53
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    BMX chains use half size links, which is why you get 300. – Kim Ryan Aug 16 '15 at 23:56
  • @KimRyan yeah but is Walmart selling half link chains? – jqning Aug 17 '15 at 2:34
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That chain should work OK. 300 links means probably a halflinks chain. Most BMX bikes are 1 speed and many use half link chains.

You will need a chain breaker though to get the length right. To get the length right, count the old links - DO NOT measure the actual length of the old one as the chain could be worn (stretched).

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