Originally Posted by
ehcoplex
OK, I used the big chainring-largest cog +1", bypassing the DR to determine chain length. But this doesn't seem to look right- it's on the largest cog and 42T chainring (I'm running 45, 42, 30...). Should the DR be extending this far forward, or do I need to add a link or 2? (It
is shifting fine, BTW...). Thx

If that photo is on the
42T ring, and you’re running 45-42-30 rings as stated, then I’d say the the chain is too short! Can you safely shift on and off the 45 when on the biggest rear cog? Test
very carefully on the stand, and don’t try to force anything.