Some ideas:

Maybe start by putting the front of the car on jackstands and grasping each
front wheel at first the 12 o'clock and 6 o'clock positions; then the 3
o'clock and 9 o'clock positions and pushing/pulling so as to seek play in
the wheel. There's supposed to be practically none.

If someone puts their head under the car and looks at the suspension system
ball joints at the same time, he/she might also see some movement that's
not supposed to be there

Possibly a bad wheel bearing might be behind this.

Does the noise sound different on turns? Possibly a steering system tie rod
come loose or bent.

Hit anything that might have got into the undercarriage lately? Or that
might have bent a wheel rim?

"Google Beta User" > wrote
> 91 Accord LX.
>
> I don't know that it's the engine, I suspect it's the wheels. It is
> audible at lower speeds (under 10 mph). The best way I can describe it
> is a clanking noise as opposed to a grinding noise.
>
> As far as I can tell, the car is driving fine - I get on the highway to
> to to work everyday. Anti-Freeze filled, oil change done, tires changed
> and balanced....
>
> I put the question mark because I'm not even sure that the wheels are
> actually the problem.