Jesper
Retro Guru
@keithglos do you think I could use a chain tensioner pulley mounted on the chainstay?
Essentially, it would be similar to the old Vittoria Margherita (back pedalling) or Simplex Selection (front pedalling) style fork style changers both of which use a tensioner. My only experience is with the Simplex design used on my '36 Baggi.
I have an old Campy tensioner that might work. I would assume that if it did, I could change front gears independent of releasing the rear wheel except to possibly fine tune the chain after the front shift. I already assumed that I could not have any radical cog size diifference on the front; as you stated 52/48 was used in your application, and I was going to try something similar (52/48, or 50/48, 50/47, 50/46).
I would not even be thinking about the front cog(s) for this bike, but since it had a relatively modern Sugino crankset on it I was not too worried about originality in design at this point.
I am still trying to obtain more appropriate parts. I have a single cog Magistroni crankset but no cottered BB to use it on unless I pull one from another complete bike.
I would need to have the proper BB offset for the chainline if using a dual front crankset; the BB presently installed may not suffice for that application.
Essentially, it would be similar to the old Vittoria Margherita (back pedalling) or Simplex Selection (front pedalling) style fork style changers both of which use a tensioner. My only experience is with the Simplex design used on my '36 Baggi.
I have an old Campy tensioner that might work. I would assume that if it did, I could change front gears independent of releasing the rear wheel except to possibly fine tune the chain after the front shift. I already assumed that I could not have any radical cog size diifference on the front; as you stated 52/48 was used in your application, and I was going to try something similar (52/48, or 50/48, 50/47, 50/46).
I would not even be thinking about the front cog(s) for this bike, but since it had a relatively modern Sugino crankset on it I was not too worried about originality in design at this point.
I am still trying to obtain more appropriate parts. I have a single cog Magistroni crankset but no cottered BB to use it on unless I pull one from another complete bike.
I would need to have the proper BB offset for the chainline if using a dual front crankset; the BB presently installed may not suffice for that application.
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