OK, so I have to ask. Why did they put that groove in the tops of the teeth? My chain zzzzing'ed on me the other day and it is not a nice thing to have happen. Is there a chain that will be less likely to do this (I am running the modern sram chain)?
Also, I thought the cogs are hardened steel, but I could be wrong on this one. Wouldn't grinding them hurt the hardening if they are? I think I am off to buy a grinding wheel.
See my restored Peugeot at (Sheldon, I thank you somewhere
in this link for your nice pages on french bikes):
http://members.cox.net/
Dan Kasha
Providence RI
> Back in the day, I used to do a "Sheldo-Glide" modification to Regina
\r?\n> and Atom freewheel cogs. I'd take the freewheels apart and reshape
\r?\n> the teeth with a grinding wheel.
\r?\n>
\r?\n> You may remember that they had this stoopit groove running along the
\r?\n> tops of all of the teeth, which would sometimes cause the chain to
\r?\n> zzzzzzzing over the tops of the teeth instead of settling down
\r?\n> properly after a shift. I would bevel the inside edge of each tooth,
\r?\n> eliminating this groove. I also attacked the front corners of the
\r?\n> teeth, making the sprockets look a bit like they had saw teeth, when
\r?\n> viewed in profile (the high end was the side the chain pulled against.
\r?\n>
\r?\n> These modifications resulted in notably improved shifting.