These 55mm 95a wheels change color in the cold from white (at 72°F and above) to blue (at 55°F and below). The color change happens gradually based on the ambient temperature of the air below 72°F.
The 55mm Therm O Thanes have a round cut shape and measure 33mm wide with a 16mm non-treaded (smooth) riding surface.
Made in USA & sold as a set of four (4).