Weird clicking noise

Hi

I seem to have a weird clicking noise from the o/s/f wheel. I only notice it at low speeds. I've fairly recently had both wheel hubs replaced.

Anybody had the same problem or got any advice?
 
You checked the tire to see if you have anything in it? Could be a stone trapped in the tread or nail or screw ( hope I'm wrong ) but worth a look, before you start looking at mechanical issues