Item Dimensions LxWxH 13.39 x 13.39 x 2.36 inches Brand - Serfas Bike Type - Road Bike Material - Rubber About this item Our dual density Technology uses multiple rubber compounds used to improve feel and durability Harder rubber compounds give you improved rolling resistance and improved longevity, while softer compounds on the outer tire improve grip Will help to reduce your risk of flats through the use of thin weave nylon layers between the tire casing and tread layer