"P.C. Kohler" wrote:
>
> >
> > How many miles do you have on the 13T cog do you estimate Peter? My
> > experience was that the hard anodized aluminum cogs wore fairly quickly.
> > Are you using the Sedisport bushless chain?
> >
> > Chuck Schmidt
> > South Pasadena, CA
>
> Good question... maybe 500 miles on the 13t cog on my '75 Pro. So is the
> Sedisport bushless chain the best for these?? I seem to recall some of these
> alloy freewheels came with steel 13t cogs since those got the most wear.
Yes, I believe the late 70s Sedisport is more gentle on these freewheels than other chains of the period. The Maillard alloy freewheel (came with hard anodized aluminum body and cogs) didn't come with a steel 13T but you could substitute one from the Maillard steel freewheel if you wanted. Maillard sold nice freewheel kits so you could put together the ratios you needed. Also very easy to work with since all but the smallest cogs were splined.
I never wore out a 13T even though I used mine for the local Tuesday/Thursday Rose Bowl training race for years. The Rose Bowl training race is great fun, 32 miles in length, average time one hour and six minutes (29 mph average) to one hour and 12 minutes (26.5 mph average) and dates to the 1930s.
Back in the day (late 70s - early 1980s?) I read in the cycling press that all the Tour de France teams where issued Maillard freewheels and a large wood box of Sedisport chain in bulk.
Chuck Schmidt South Pasadena, CA
.