Product Overview:
This is the new wheel included in the 2012 FIRST Robotics Competition Kit of Parts.  It is a 6 inch diameter wheel with a polycarbonate body and a TPU rubber "HiGrip" tread.

No bearings or hubs are included in this wheel.

Specifications:

• Diameter: 6 inches
• Body Material: Polycarbonate, black
  
• Tread Material: TPU rubber, 77a durometer, natural color (clear)
  
• Bore: 0.95 inch
  
• Weight: 0.5 pound
  
• Bolt Pattern: six holes (0.17 inch diameter) on a 1.875 inch diameter bolt circle
• Coefficient of friction: 0.95-1.0 static (on tight pile carpet)
  

Usage:
Use #10-24x3/4 thread forming screws to attach sprockets or hubs to this wheel.

With Axle and Hub:

• If you wish to drive this wheel with an Axle and Hub, you can pick your hub by fitting any of the AndyMark hubs (not included) to this wheel. If this is your choice, then no bearing is needed.  Use #10-24x3/4 thread forming screws to fasten a hub to this wheel.
  

With Sprocket:

• If you wish to drive this wheel with a sprocket, then the sprocket needs to be attached to the side of the wheel, and two ball bearings need to be pressed into the wheel (one on each side). The ball bearing must have a 1.125" od. For a 1/2" id, use am-0181 or am-0029. For a 3/8" id, use am-0209. Use #10-24x3/4 thread forming screws to fasten the sprocket to the wheel. 

With Bearings:

• To press bearings into this wheel (for a free spinning wheel or for use with a sprocket), two ball bearings need to be pressed into the wheel (one on each side). The ball bearing must have a 1.125" od. For a 1/2" id, use am-0181 or am-0029. For a 3/8" id, use am-0209.

• 6" HiGrip Wheel Layout (.pdf)
• 6" HiGrip Wheel CAD File (.stp) (right click, save as)