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Keðjuverkun/Chain Reaction is a DIY bicycle collective in Reykjavík, Iceland that started in April 2010. Keðjuverkun provides a space, tools and parts for people to fix their own bikes or the up-for-grabs bikes that are available. During opening hours people can get help to learn how to fix their bikes but no one will do anything for you that you can do for yourself.
Keðjuverkun is currently on hiatus but might open again next spring.