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@tomasito
eh?
"Despite this, the 25c format is too fat for racing. The width of the tyre increases frontal area and air drag, ruling it out for time trials on smooth roads. The increased weight is a significant handicap in any acceleration, so they aren't much use in a bunch. For training, touring and randonnees, however, the fatter tyre is simply a superior option, provided it will fit in your frame. "