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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@DFP
GA2G famously owns the GRP lock, keeps going on about it :)
I purchased a mini-U from the same brand to give to a friend. Seem strong but the smaller one was very rattly and you only get two keys, which is about 3 keys less than I am comfortable with.