Which replacement pulley wheels fit a Shimano RD-6400/6401? I'm looking for replacement pulley wheels for my RD-6401. It needs to have 10 teeth and a thickness of about 7.2mm.
I do have a set of Shimano 10 teeth pulley wheels in front of me (Y56398030) which don't fit because they are about 9mm thick (plus they are of poor quality).
Are there still replacements parts available?
There are third party replacement pulleys available from at least BBB brand. They come with a set of adapters for different derailleurs, and in my opinion are better quality than low to mid tier original pulleys. There is also good chance that searching for the original spare part code finds a mail order shop that has the original part.