If you are looking for something larger in diameter to bring down your rpm, then you have few options. Your current tires are 28" tall. They are the same diameter as the 275/60's (which I find to be about the perfect size tire for the rear of anything based on the width and diameter). If you really want to go taller, then you could go to a 285/70, which has a diameter of 30.8", or a 255/70 with a diameter of 29.1".
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