trying to diagnose a noise without hearing it is pretty impossible but a few suggestions
wheel bearing, check ALL of them just because it appears to come from somewhere dosent mean thats where its coming from
tyres, some tyres can be noisy and since you have just rotated them this could be the noise
tracking, could be a tyre scrubbing
brakes, does the noise change/go away when you brake
just a few suggestions but if all else fails turn up the radio
ttfn glenn
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