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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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@sqwonk
There's a 53T on eBay just now.
https://www.ebay.co.uk/itm/Shimano-Olympic-Zen-track-chainring-53t/174149293045?hash=item288c1b53f5:g:5zYAAOSwHU9eFaXj