john apart from having something built your best choice might be a disc hub wheel with a cog on the disc side http://www.velosolo.co.uk/shopdisc.html
tada- fixed/free
here's a nice one
http://www.on-one-shop.co.uk/acatalog/info_WROO456R36.html
@hurricanejosh started
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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john apart from having something built your best choice might be a disc hub wheel with a cog on the disc side http://www.velosolo.co.uk/shopdisc.html
tada- fixed/free
here's a nice one
http://www.on-one-shop.co.uk/acatalog/info_WROO456R36.html