Faulty Drivetrain

John6345 Posts: 2
edited August 2019 in Workshop

I’m kinda hoping you guys can offer some clarity on a serious fault my Cannondale Supersix suffered.

Basically the chainring crank and the left side crank have become unseated from the BB and are turning independently, plus they are both sticking out so far from the BB you can see the threads etc where they would screw in.

Now the bike is brand new and has only been rides for a few hundred miles so it’s very strange indeed.

I am in touch with the company I bought it from.

Many thanks


  • keef66
    keef66 Posts: 13,123
    Bloody hell! :shock: They don't usually fall apart.

    Straight back to the retailer.
  • keef66
    keef66 Posts: 13,123
    Hang on a minute, you mention threads being visible. Don't Cannondales use pressfit bottom brackets?

    Can you post some pictures?
  • imposter2.0
    imposter2.0 Posts: 12,028
    You won't get much clarity here with the description you've given so far. Going to need a better description, or some pics. But if you say you've already been in touch with the shop, then let them sort it.
  • shirley_basso
    shirley_basso Posts: 6,195
    Sounds like the 2 sides of the crank have come apart.