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Are the down tube shifters friction or indexed. If solely the friction type it sounds as they are too loose. Adjust them to give greater resistance.
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a slight tug on the cable at the downtube will shift the lever into the next sprocket
Definitely sounds like a friction lever with insufficent friction
a slight tug on the cable at the downtube will shift the lever into the next sprocket
Makes it sound like your shifters are indexed? If so, something's wrong with the indexing?
Actually, are you possibly just missing the piece on the left (or its equivalent)?
freezing77
M_V
@Polco
I'm hoping someone on here can help! I've recently built up a 531 frame with some modern components, albeit with down tube shifters. Trouble is, when I ride on even the slightest gradient or when I push off at the lights the gears shift down the block leaving me grinding along in a big gear! I've noticed even a slight tug on the cable at the downtube will shift the lever into the next sprocket, the derailleur is screwed in tight, I've tried it with two different levers with the same result. The hanger looks straight and the chain looks like it's in a straight line from sprocket through the jockey wheels, and I've experimented with different chain lengths with the same result, anyone got any other ideas?