It looks in post #1 like the lower pivot bolt is coaxial with the upper pulley. Too much to say that the Soma cage, with an offset there, might give more chain wrap?
Originally Posted by
JohnDThompson
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Larry:1958 Drysdale, 1961 Gitane Gran Sport, 1974 Zeus track, 1988 Masi Gran Corsa, 1974 Falcon, 1980 Palo Alto, 1973 Raleigh Gran Sport, 1974 Legnano. Susan: 1976 Windsor Profesional.