Re: Derailleur rattling?

On Thu, 15 May 2025 22:47:37 -0400,
  Frank Krygowski <frkrygow@gXXmail.com> wrote:

 On 5/15/2025 9:10 AM, Ted Heise wrote:

   ...On my tandem, the chain doesn't like the two smallest
cogs when on the middle ring. Tracked this down to chainline,
basically the chain comes into contact with the inner side of
the big ring and feints at shifting to it.  According to my
tandem dealer, there's no simple fix to this, so I just don't
use those combinations

 
 How much is the interference? If small, might it be possible to
 use spacers to move the big ring a bit farther out? There might
 be danger of dropping the chain between rings in a slow shift,
 but it might be manageable.

Good thought, but probably more trouble than it's worth.  As it
is, I just need to be sure we're on the big ring if we need to
apply power at speeds over 20 mph.  I'm pretty well used to it,
and don't forget all that often.  When I do, the light catching
gives a reasonably benign reminder.

Thanks for the suggestion!

--
Ted Heise      <theise@panix.com>       West Lafayette, IN, USA