Tire brand/design may have to do a lot with it. When I first bought my Z, the tires used to produce a droning-like sound (kinda like a low howling). When I got new tires, I went ahead and bought Dunlops. The "howling" ended. Also, the ride improved like 50% (i.e. a less jarring ride with the Dunlops, versus the Bridgetown Potenzas).
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