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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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GreatSince78
http://www.ebay.fr/itm/PEDALIER-SHIMANO-500EX-BIOPACE-170-52-42-VINTAGE-CHAINSET-/171547725314?pt=LH_DefaultDomain_71&hash=item27f10a8e02 I'd contact this guy. he has several ebay profiles and it seems he also has RD and shifters from this Ex500 gruppo.
BTW, Ex500 is almost the same as RX-100, which is pretty much 105sc with polished raw finish rather than paint.
Very nice piece of gruppo!