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Silicone Tire Pair for 80 x 10 mm / 90 x 10 mm Pololu Wheels Can be used as replacements Is made of 2.5 mm-thick silicone Features horizontal treads for improved traction This Silicone Tire Pair for 80 x 10 mm / 90 x 10 mm Pololu Wheels can be used as replacements for the ones included with the 80 x 10 mm and 90 x 10 mm Pololu wheels, and they can also be used as tires for other similarly sized wheels. The tires are made of 2.5 mm-thick silicone and feature horizontal treads for improved traction. They have a width of 10 mm and an unstretched outer diameter of 66 mm, and they can comfortably stretch to fit wheels up to 90 mm in diameter.