the humming occurs if both are going IME.
if it's only one for some reason (you nudge your driveway kerb on one side everyday for years...) it can wobble. i had this exact problem in my RX3 and i was told it was tyres, so i put new ones on and the problem was better, but still there. i changed the wheel bearings and problem solved.

tires can be odd, try rotating the tires and seeing if the problem changes.

Yes, check the tires. Just run your hand along the surface to feel for bulges. I had this happen last year, and indeed it did odd things like shake at slow speeds, but get smoother at high speeds.

Hi Reeves.
If you think back a bit.
Did it do this before you replaced the suspention rubbers?
If not, I would suggest to take one of the front wheels off and inspect everything up front.
It is possible that one of the rubbers are not correctly fitted or got damaged or anything like that. Inspect everything on your suspention. Even the tyres that some mentioned.
None of the suspention parts must be loose so that you can move it by hand. I know all mine is tight and mine was also replaced.
Somewhere something is loose or incorrect.
Goodluck.

Yo dude,converted
This did cross my mind, about the tyre been ####ed, but again, I dont think so.
Woudnt I be noticing the shudder all the time.
Like I stated earlier, this shidder occurs periodically{now and then}

Nope, pro-240c.
I havnt had the w\bearings replaced.
I dont think that could be the problem, cause, theres no hum or shudders at high speeds.
Correct me if I'm wrong, but isnt it a sign of w\bearing wear, especially if there's a humming \winding sound whilst in movement.Where are all the Dattomatsers on this one?

Sounds like a "seppo" tyre, where the tyre develops a bubble through the steel belts...kind of like a hernia in a human.
Just get new tyres with a free balance and alignment and all will be good.

i've had this happen on a 4wd mine had an egg in the tyre and under 60klmh it felt like the front end was going to fall off. over that and it went away. freaky

have you replaced your wheel bearings?

My thaughts exactly DD.

Sorry, I should have used my words better to describe the shudder type..
Its not a small shudder, its more a like major earthquake at times,
its like a wheels about to come off,and the d\board rattles big time.
The wheels feels like they doing the Macarena.

Hoever they shudder goes away after I gain speed, and remember this happens periodically.