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The 13 inch tires weigh about 1 or 2 pounds less, the 13 wheels weigh about 4 pounds less, so almost 6 pounds less total, times 4, plus a shorter lever arm for less inertial resistance. Plus I can get 13 tires in 155 width, opposed to 175 for the 14, so it may even have less rolling and air resistance.
Pick up 6 pounds in your hand and wave it around in the air. Removing that weight also gives better suspension control.
Maybe I just answered my own question, but I have no measured data. Anyone who does?
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