My 4th ed. Sutherland's manual (1985) gives a max freewheel sprocket of 28 teeth for both models of Shimano 600 short-cage derailleurs. Sloan's book says the same thing.
Note that the "capacity" (difference between largest & smallest chainrings plus the difference between the largest & smallest freewheel sprockets is also given as 28 teeth in Sutherland's manual.
Also, these limits can be a little theoretical--on some installations, my NR and SR derailleurs handle 28 teeth without a problem, and on others, it took a little tweaking to get even 26 to work.
Steve Maas (With bad ankles and low gears in) Long Beach, California
photo1@osmiumtet.com wrote:
> Hi All,
>
> I'm currently riding an early to mid 80's classic steel Specialized Allez.
> It's an awesome bike, but I ride in a hilly area so I'm looking to put a
> bigger freewheel on the rear. Currently, I have a 7 speed freewheel with
> the largest cog being 24 teeth with a Shimano 600 short cage rear derailer
> and a double chain on the front. Does anybody know what the largest rear
> cog is that you can use with the Shimano 600 short cage derailer from the
> mid 80's. I tried to find the info on Shimano's web page but I couldn't
> locate any info on the older Shimano components. Thanks.
>
> Roland
>
> _______________________________________________
>
> .