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Schwalbe. Schwalbe Marathon Plus Tour tyre review. Tough touring rubber. Our rating . 4.5 out of 5 star rating 4.5 GBP £29.99 RRP. MARATHON PLUS The Flat-less tire. Schwalbe's best selling model. The most puncture resistant pneumatic tire there is. In addition to the superior puncture protection it features many hidden values: Rolling resistance. The patented, 5 mm thick SmartGuard layer, when compared to all generic products, has a significant advantage in rolling resistance.