Roger Sacilotto said:I am helping fix up an old bike (1987 Trek EX560 steel, 126mm dropouts)
with minimum $$. The bike has a Shimano 105 (FH-1050) rear hub with a
Uniglide 6-speed cassette. The rear derailer is a Shimano 105 (RD-1051).
Can I upgrade to a 7-speed cassette?
You'll need to replace the Freehub body, about a $20 part.
See: http://sheldonbrown.com/k7.html#transplant
and: http:// sheldonbrown.com/harris/k7.html#bodies The NOS HG20 hubs
we offer near the bottom of that screen are your easiest, least
expensive upgrade path.
Quoted message said:Can I install Shimano 7-speed SIS
bar-end shifters even the cassette can't be upgraded? If not, will a 7-
speed indexed downtube shifter work? The current setup has a friction
downtube shifter that I would like to replace.
Yes. Your present rear derailer will work for indexing if it has an
adjusting barrel where the loop of housing from the chainstay enters the
derailer.
Sheldon "7" Brown
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Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
Hard-to-find parts shipped Worldwide
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