Old stuff: Shimano 105 6 vs. 7 speed?

Roger Sacilotto wrote:
> 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.

> 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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On Tue, 05 Apr 2005 21:56:16 -0400, Sheldon Brown
<[email protected]> wrote:

>Roger Sacilotto wrote:
>> 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?
>>
><snip>
>
>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.

I just went down to the garage and plucked an RD-1051 out of the old
parts box, and it has a barrel adjuster.


jeverett3<AT>earthlink<DOT>net http://home.earthlink.net/~jeverett3