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The Marathons are a little heavier than the Brompton tyres and the deep uni-directional tread, which gives superior grip, also means that they are not quite as free-running. But they are solidly-built, with both a Kevlar belt and a thicker sidewall to lower the risk of pinch-punctures. Like the Brompton tyres, they also come with reflective sidewalls, eliminating the need for reflectors on the wheel spokes.