2 ms·

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

• bombcar 3y ago
  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 3y ago
    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 3y ago
      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 3y ago
  Yup. The cheap 'heavy' ones are forged. Safe.