Have a look for the transmission database for what works with the on-one hubs and your choice of crankset. (Tiswas' link)
You can get a good solid BB for around £20. Check the classifieds if you need something for around £5. How budget do you need to go?
@Aroogah 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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Have a look for the transmission database for what works with the on-one hubs and your choice of crankset. (Tiswas' link)
You can get a good solid BB for around £20. Check the classifieds if you need something for around £5. How budget do you need to go?