"Fred" <
[email protected]> wrote in message
news:[email protected]...
> I have a R700 with 105 comps. I live in the mountains &
would like to
> change the rear cassette to provide a lower gear ratio.
Any
> suggestions?
>
> Thanks, Fred
You don't state what you have now, or whether it's double or triple, and how low a gear
ratio you want
With an otherwise standard Shimano 105 triple nine speed set-up, (52-42-30 crankset), I'm using a
custom 13-14-15-16-17-19-21-24-28, which works for me - about 28 gear-inches. A "standard" 12-27
Ultegra nine speed cassette would also work
If you've only a double, a 39T small ring and the 28T large sprocket will get you down to about 37
gear-inches. You can try a larger rear sprocket, but at the expense of wider gaps between adjacent
sprockets. You can get Shimano compatible ATB cassettes with 11-30, 11-32, or 12-34. IMHO, though,
the 11T is a waste of time on a road bike with a 52T or 53T large chainring, so better to customize
these to a 12T or 13T smallest sprocket