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Tijmen-
http://www.disraeligears.co.uk/Site/EGS_Up_Cage_derailleur.html
"EGS claimed that the up-shot of all this cleverness was that the chain length was reduced by 15%, ground clearance was improved by 70mm to 90mm and chain slap was dramatically reduced."
http://www.ebay.co.uk/itm/Rare-EGS-Up-Cage-Pro-rear-derailleur-/231852808191
not cheap...
fredtc