Could use more information on when, where and under what conditions you hear the noist.
for example, is the noitse only heard at speeds under 15 mph, or is the noise only heard when driving down alleys or along curbs? Is the noise a rotational noise (one tick for ever turn of the wheel) or does the noise in time with engine speed or just totally random? Is the noise heard all the time or is it intermittant? or, only heard in dry weather and not in rainy weather? or only on concrete roads and not on tarmac? or only on hot days and not on cold? or only going in reverse and not going forward?
there are numerous causes for that type of noise but without information to narrow down the possibilities we'd only be guessing. And that wastes a lot of time.
two things to check that are common--obviously check the tyres for rocks or a bolt or other in the tread that would cause a rotational tick (once tick for every rotation of the tires). and, the othre common thing if the noise is heard when driving along curbing or walls is to take the wheel covers off and see if the noise goes away. its not uncommon for the wheel covers to produce a ticking noise as they flex.
beyond that, we really need much more information to be of any help.
hope that helps
