I just want to make sure I'm not doing something dumb before I shorten my chain!
I bought a used touring bike (on here), Croix De Fer frame. The previous owner had it equipped with 42T/30T chain rings and a 12-28 cassette. This was a bit of a tight range for me, but he had a spare 11-32 (11-speed) cassette, so he put that on before he sold it to me.
Still, quite a tight range; the highest gear was quite low for me (42T/11), so I changed the big chainring to a 46T, and thus I needed a new chain.
I also discovered that it's not a 32 cog, but a 34 cog on the cassette, so the bike now has quite a wide range.
I've put the new chain on, but I'm having issues with the rear derailleur. In small chainring and 4th smallest cog (ie. 4th highest gear) the chain is rubbing on the jockey wheel cage.
Seems like the chain is too long, which is understandable since I have 46T chainring and 34 cassette; that's a lot of teeth. I've measured and remeasured using the 2 popular protocols; the formula (I have a 16.75-17ish inch chainstay) which gives 55 inches for the chain. Also wrapping the chain round the big cog and big chainring and subtracting 1 link also gave the exact same length.
Basically my gear range is too wide! I just wanted to check that it's sensible to remove another link. This would pull the jockey wheels away from the cassette, and offer much more clearance when on the small chain ring.
On the big chainring and big rear cog, the jockey wheel is pulled forward more than 45°, but I think it would be fine with 1 less link on the chain. And besides, I'd rather not have big chainring big cog than not have small chainring and highest FOUR cogs.
Just FYI, the B-Screw is all the way in, so there's no room to budge on that.