On 2018-11-18 10:17, wrote:
On Saturday, November 10, 2018 at 2:53:28 PM UTC-8, John B. slocomb
wrote:
On Sat, 10 Nov 2018 12:51:48 -0800, 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



My rather limited experience has been that the
cassettes with the larger cogs usually have the largest 3 or 4
cogs riveted to a hub that connects them to the free hub so yes you
can hack them if you accept the size and spacing of the largest
three, or so, cogs.

Some time ago I think you talked about using friction shifters and
if you do that then the spacing of the cassette is no longer
relevant as the friction shifters will shift any cassette.

cheers,

John B.

I was repairing a friend's bike yesterday and he uses a 10 speed
12-34 and the lower 8 speeds of the Deore cassette were all rivetted
together. I didn't like the cassette or the long arm derailleur that
goes with it.


Yesterday I received the big Sunrace cassette, including new derailer
and derailer extender. The cassette has only one screw and it almost
fell into pieces when I dragged it out of its box. Not a problem, just
strange. It's huge, almost the diameter of a dessert plate.

This week's ride got smoked out (literally) and then it's suposed to
begin to rain on Wednesday. So maybe some time to do the cassette hack
unless something on the honey-do lits wins. Like the pool sweep that
just quit.

--
Regards, Joerg

http://www.analogconsultants.com/