Mine sounds like a car according to people who have biked with me. Between the resonance of the huge rubber and the crushing of debris under tread, it does sound very automotive like. That comes in really handy on the "bike path" with clueless dog walkers and "five hands across the path for peace" knucklehead walkers and joggers. There are regular patrols of SUV driving cops on the path. Soon as a dog walker hears my tires humming they jerk fido waaaay over to the side thinking it is one of the cop-mobiles. Awesome!