I'm switching from the stock 12-27 cassette to an 11-23. This freed up a lot of chain. Is there some rule of thumb to determine how many links to remove?
The rule of thumb I follow is to put the chain on the big ring and the largest cassette. The R derailer should then have a forward angle of about 45 degrees and not be pulling the derailer any further forward.
Then do a small ring, smallest cog and make sure the chain is clearing the upper jockey pulley as the derailer is almost level.
Then remove/add clinks as required.
Ohhhhhhh....I suppose just because I have a different way to do it I've just got to say something!
I use the big-big combo as lightingguy suggests but not threaded through the RD. Pull the chain tight, see where the ends match up, then add two links to that length and break the chain so it mates up correctly. As with most things where it's tough to undo a mistake, round up a link if in doubt.
My guess is that this way works also because when you add the two links, it's adds the necessary length to get that angle in the RD lightingguy was referring to.
2014 Specialized RoubaixOOOOOO 2003 Interloc ImpalaOOOOOO 2007 ParkPre Image C6 (RIP)
lightingguy's method worked. But I was a bit ambitious and lopped of 2 links at once. I probably should have done just 1 being that I was planning to use the stock cassette on a trainer wheel with a trainer tire. Doh!
I guess I'll just have to get an 11-23 for that wheel, too.