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chain for my boys bike

Scottboy's picture

By Scottboy - Posted on 05 November 2013

My eldest has a 24" mountain bike it is less than a year old and chain has stretched from spinning too much it is a 21 speed or 3x7 for those that are bad at maths. Can I use a 9 speed chain or has to be a specific 7 speed

hawkeye's picture

Sorry Smiling

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