French Patent # 2,759,968 - EGS

French Patent 2,759,968 - EGS main image

This patent displays the signature features of the EGS Up Cage derailleur. They are all there, the cable roller, the slant parallelogram, the phosphor-bronze bushes and the three pulley design - with a fixed guide pulley and a totally separate upside-down pulley cage delivering chain tension. Brilliantly bizarre.

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EGS Up Cage derailleur thumbnail

EGS Up Cage 1998?