[jdechko]

Thanks for posting this. I’m going to check mine as soon as I get home.

https://bike.shimano.com/en-US/information/customer-services...

For quick reference the affected model numbers are DURA-ACE and ULTEGRA branded cranksets with the following model numbers: ULTEGRA FC-6800, FC-R8000 and DURA-ACE FC-9000, FC-R9100 and FC-R9100-P.

[lostlogin]

Luckily, mine are all the cheap Shimano ones. This is their top stuff isn’t it?

[bombcar]

In biking especially the high end stuff is often made out of exotic materials for low weight and can do strange non-metallic thinks, like shattering.

[wl]

These cranks are aluminum. The problem is that they are a hollow clamshell design to save weight. The bonding of that clamshell design is problematic.

[jeffbee]

The newer hollow cranks aren't problematic, so it can't be just that it's difficult to make a hollow crank. And it's not even that fancy any more, considering that the $100 FC-R7000 is also hollow.

[petre]

Yup. The cheap 'heavy' ones are forged. Safe.