On 2018-11-10 19:26, Sir Ridesalot wrote:
On Saturday, November 10, 2018 at 3:51:38 PM UTC-5, 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/
Maybe think about changing the crankset to smaller chainrings
instead?
That is the other option, getting a compact for a square-taper BB.
Requires a new derailer as well but for the front. However, I'd like to
keep the old 52T and 42T combo. When riding on the 30mi long bike path
between Sacramento and Folsom on a busier day that is just the right
combination for a quick downshift, to accelerate hard and pass another
cyclist, then shift back to the 52T ring.
... Won't getting the rear derailleur low enough to clear that
40 teeth cog also make the derailleur more vulnerable to getting
smacked by a rock?
While I do go offroad with my road bike it's not gnarly and then I ride
slowly. On the MTB the rear derailer gets smacked a lot and I had to
bend the hanger back numerous times during rides. The M781 derailer on
the MTB is surprisingly sturdy. It's missing a little piece in the
middle but still going strong.
--
Regards, Joerg
http://www.analogconsultants.com/