Bottom bracket/pedal/crank noise. But which?

Onan

It's a clicking/knocking noise when I pedal. Sometimes one per complete revolution, sometimes one per half revolution, and only when I'm mashing, or going uphill. How do I figure out if it's a pedal, if my crank arm just needs tightening up (how do I do that by the way?), or if it's my bottom bracket?

I r stoopid.

EDIT: It's a halfords special carrera subway. Sealed bottom bracket I think.

Slow Downcp

It could be seatpost - does it stop if you're pedalling out of the saddle?

Onan

Slow Downcp wrote:

It could be seatpost - does it stop if you're pedalling out of the saddle?

Good question. I will check that out.

Onan

It does it standing up. It's rhythmic with the pedals, so I'm pretty sure it's crank/bottom bracket/pedal bearings.

Any idea how to diagnose which?

How do I tighten up a crank arm?

supersonic

Process of elimination.

Park Tools has a guide on bike noises.