Noise from bottom bracket

The cracking noise can be produced by nearly any component of your bike.

The frame transmits the noise and it only seems like to come from your bottom bracket (or you think it is the source because of pedalling).

I had a similar problem with several of my bikes - in my experience it is normally a component which is not 100% tightened.

I would check following things:

• are the quick releases tight enough (rims and seatpost)
• are the screws tight enough (especially on the saddle)

You can try to find the noise by stepping on one pedal while the bike is standing still.