Originally Posted by
auldgeunquers
I can understand the desire to change out the Simplex - I had a chain jam in one the other day and the whole thing kind of "exploded".
I just went to my parts bin and chose the cleanest Shimano SIS off of some big box bike I stripped and had it adjusted and running in about half an hour - though interestingly the Shimano seems to need more cable travel to reach all the gears than the Simplex did. I am still using the Simplex friction shifters. Shift much better.
I should think, that for a quick and dirty period correct all metal look, an old Shimano Tourney would look good, and I would expect an improvement in action over any of the later plastic Simplex units, eh? I seem I see those Shimano Tourneys on about half of the lower end bikes from "the correct" period - the other half have ... something else. I have a couple in my life now that came on bikes I got for 10 bucks at the ReStore.
Then - you have a good looking rider while you shop for a period correct upgrade unit - or modern unit that looks right ... if you must ....
That is because of the slant parallelogram design shipmano started using as soon as Suntour's paten expired.
Originally Posted by
eschlwc
looks like the chain is routed wrong around your pulley wheels.
.
It is setup that way to reduce pulley friction.
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