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@GA2G
The only chains recommended on this forum are those that are 16mm or thicker. These are impossible to carry as they weigh more than the bike. Any other chains are not recommended. These 16mm chains can be used if left overnight at the point of daily locking. So they can be used, but not carried around.
Good security requires at least one 16mm lock (shackle or chain) and a secondary lock of 13mm or thicker. The best option is a main lock of 18mm or equivalent and the best secondary lock possible. These don't have to be the most expensive options, just the strongest options within the price range.