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Old 08-02-20, 03:48 PM
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canopus 
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Location: Kingwood, TX
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Bikes: 1985 Cannondale SR300, 1985 Cannondale ST400, 1984 Trek 760, 1984 Trek 610, 1984 Trek 720, 1981 Trek 710, 1979 Trek 710, Gary Littlejohn Cruiser, BMX

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Looks like a 34 large cog in the rear... and a 7s freewheel. Is it a 34t cog? Is it friction or indexed? It looks like the derailleur can't handle the cog. Looks like the wheel is shoved all the way forward also. You could try pulling the rear wheel back in the dropout (see where the previous QR marks are?) to see it that gives your large cog some clearance from the pulley. Also try what andrewclaus suggested, loosen the cable and try to manually move the derailleur through the shifts, If you can move it manually through the shifts then you can look at the cable and shifter to see if it pulls enough to move the shifter. Look at the B screw and see where it is on the mount and if it makes a difference when adjusted while the cable is loose.
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1984 Cannondale ST
1985 Cannondale SR300
1980 Gary Littlejohn Cruiser
1984 Trek 760
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