On 2018-11-10, Joerg wrote:
Getting older, I'd like to increase the large cog to at least 40T from
my current 32T. Of course, that will require me to retire the trusty old
Shimano 600 derailer. I don't want the cassette to become ever wider and
also need to maintain 7-speed spacing so I can use the more robust
old-style 7.3mm pin length chains such as KMC Z50 (can't find the Sachs
anymore). In the past I hacked cassettes, installed the cogs I wanted
and re-used the old spacers. Can the larger cassettes like in the link
below still be hacked apart? I don't mind drilling or dremeling stuff to
get them apart. If memory serves me correctly I've installed a Shimano
STX-RC freehub on the road bike after the last UG freehub had croaked.
https://www.ebay.com/itm/SunRace-CSM...k/132325285327
This post makes me question a lot of things, including your sense of
time invested vs getting what you want no matter how the industry has
stopped doing it that way. Moving past that, though:
If you want to maintain 7sp spacing, then your hub has a 7sp cassette
body, probably HG with 31.9mm width. You should tell us specifically
what it is, though; widths vary, including the also-7sp Shimano IG.
You've posted an 8sp cassette (36.5mm width). Photo #2 shows the
one silver and two black pins holding the cogs together. You could
think about using a drill press, I suppose, but looking at photo #1
there looks like a color difference between the smallest 3 cogs and
the rest, which adds to my suspicion that they're separate from the
larger pinned set. If that's so, then you can think about omitting
cogs and spacers to fit the smaller width of your cassette body.
For the derailer, if your 600 is a GS (aka mid cage) instead
of the short one, which I assume it is due to your current 32t
configuration, then you might try keeping it and adding a Wolf
Tooth Roadlink. Making your bike one more bit of a hack should be
considered a central part of this quest, and that fits the bill while
hopefully allowing you to keep using existing equipment.
https://www.wolftoothcomponents.com/...ducts/roadlink
--
Gregory S. Sutter Mostly Harmless
http://zer0.org/~gsutter/