These 8-tooth, injection-molded sprockets are made to work with the rugged miniature tank tracks. This set comes with four sprockets made from sturdy, black ABS plastic: two sprockets for mounting on the 7-mm shafts of 228:1 offset, 120:1 offset, 200:1 90-degree, and 120:1 90-degree pololu plastic gearmotors or Solarbotics GM2, GM3, GM8, and GM9 gearboxes, and two idler sprockets with 1/4″ holes that you can mount using shoulder bolts.
The diameter of the sprocket by itself is 1.5″. Once the rugged miniature tank tracks are around the sprocket, the total diameter is roughly 1.77″.
0-PL359