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The width is the same as for just about any single-speed bike, 1/8". The length of the chain will depend on frame size, sprocket size and chainwheel size. Chains are always bought too long and then cut to fit the actual bike.

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14y ago
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12y ago

Just count the number of sprockets at the rear hub, then look/ask for a chain for that number of speeds. Keep in mind that all chains are sold long, and usually have to be cut to size when fitted. If you haven't got a chain breaker tool yourself you might as well have the store replace the chain while you're at it. Also keep in mind that chain and sprockets wear together, and to avoid further troubles, is't often best to replace both at the same go.

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14y ago

1/8", but the length is determined by the size of the bike frame.

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14y ago

1/8", but the length is determined by the size of the bike frame.

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13y ago

Mongoose build both BMXes and MTBs, so they can have different sizes, with 20" and 26" being most common.

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Q: What size of bike chains do mongoose 20 inch bmx bikes have?
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