[CR]Modified Parts - Freewheel

(Example: Framebuilders:Chris Pauley)

From: "Dan Kasha" <kasha.lists@cox.net>
To: <classicrendezvous@bikelist.org>
References: <6557651.1042657391706.JavaMail.monkeylad@mac.com> <p05200f62ba4d29b71147@[10.0.1.31]>
Date: Thu, 16 Jan 2003 23:12:27 -0500
cc: CaptBike@sheldonbrown.com
Subject: [CR]Modified Parts - Freewheel

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/kasha.lists/peugeot/peugeot.html
Dan Kasha
Providence RI


----- Original Message -----
From: Sheldon Brown


> 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.