Basically, his BB is not aligned. The right side is "popping" out and makes the crank all sketchy. Here's a convenient diagram:



How would we fix this? Thanks!

Is there play in cranks? Who installed the BB? Which BB is it? What makes it sketchy? I installed a new Shimano BB on an older bike and the cup sticks out a bit installed with the specified torque.

There is a lot of play. Like the cranks will stop spinning when rotating it half way. The BB was already installed, but I guess it popped out?

Post in the Mechanics forum.

Let me guess, Shimano plastic cup BB?

Or it's a cup and cone with a loose/missing lockring, had to say from a sketch. Need a real picture.

Moved to Mechanics.