On 2018-11-10 14:49, jbeattie wrote:
On Saturday, November 10, 2018 at 12:51:38 PM UTC-8, Joerg wrote:
To my amazement a Sachs-Sedis chain will absolutely not exceed
0.5% stretch after more than 5000mi, despite some hills where one
has to stand in the pedals. Never had a chain last this long.
However, the rollers have developed a lot of play, about 0.040" or
1mm. How much is too much? I guess it's almost finished because of
those rollers.

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



--
Regards, Joerg

http://www.analogconsultants.com/

With the Sunrace, the big cogs are not on a carrier, so you can talk
it apart. It looks like it has one torx screw.
http://www.sunrace.com/en/products/detail/csm680


Cool. Thanks, then in can be done. I wonder why they often sell derailer
hanger adapters for that. Maybe even the long cage derailers aren't long
enough for 40T? Should work on my road bike though because it has
adjustable slot drop-outs and I already had to scoot it forward to make
the Shimano 600 derailer handle 32T (it's normally limited to 28T).

--
Regards, Joerg

http://www.analogconsultants.com/