Please confirm the size before purchase. The CST mountain bike tires C1698 feature a dual formula wear resistance material, anti-stabbing layer, and 60TPI braiding density. The tire pressure is 40-65 PSI, and the weight varies by size. The 26 * 1.75 wear resistance tire weighs approximately 530g, while the 26 * 1.75 stab proof tire weighs around 540g. The 27.5x1.75 wear resistance tire weighs about 610g, and the 27.5x1.75 stab proof tire weighs approximately 620g. The packaging includes 1 piece.