Originally Posted by
unterhausen
You would think randonneurs would have the problem a lot, because it seems to be promoted by wet weather.
I have one of the 5 arm ultegra cranks, which may be too old to have this problem? I haven't used them because you can't use other companies chain rings without modification. And then there are funny gaps. I also have cx-70 cranks, I'll have to look for glue lines.
Ya, I've heard that humidity seemed to be part of the problem but I haven't really read too much about it, did see one article on road.cc where shimano still insists it isn't a flaw in the design... but given how widespread it appears to be I hope they've tried something to make them stronger. My partner has a 6800 but she's not big on sprinting or standing/mashing but we still check the cranks fairly often.
I had a 5 arm ultegra too and I don't think they are built the same as the more modern 4-arm hollow cranks.