I recently(one month ago) replaced the two front tires on my 2004 GX 470. Shortly thereafter, I noticed a "humming noise" like driving over the non-skid grooves on a highway except much lower noise level. This noise starts at about 25 mph and continues through the speed range. It stops when making a right turn curve in the highway, but is constant when driving straight or turning left. I have driven the car about 1000 miles without any change in the noise. Is this tire noise( I had the tires rotated front to rear with no change in noise), a wheel bearing, or something else? The car has 88,000 miles on it.
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