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A narrow tire with thinner sidewalls needs more pressure and the pressure needs to be kept consistant or you smash your rim into edges. A fatter tire with thicker sidewalls can be run softer and the heavy sidewalls mean the pressure can vary a bit without the rim getting gangbanged. (ie you don't have to make sure your rear tire is perfect every damned time you ride) A big ol fat downhill tire is worth every ounce.
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I'm a man of simple tastes.
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