6" Rubber Treaded Wheel w/ 1/2" Bearings

This is the 2008 FIRST Wheel, provided to FRC teams in the Kit of Parts, with two R8 ball bearings (1/2 inch bore) pressed into each wheel. 

Specifications:

• Diameter: 6 inches
• Body Material: black polycarbonate
• Tread Material: 75A durometer urethane rubber
• Bore: 0.500 inch diameter bearing bore
• Weight: 0.51 pounds
• Bolt Pattern: six holes (0.17 inch diameter) on a 1.875 inch diameter bolt circle
• Coefficient of friction: 0.9 static (on tight pile carpet)

Usage:
Use #10-24x3/4 thread forming screws to attach sprockets or hubs to this wheel. Three (3) screws are sufficient for each 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 one ball bearing needs to be pressed into the wheel (on one side). The ball bearing must have a 1.125" od. For a 1/2" id, use am-0030. For a 3/8" id, use am-0573. Use #10-24x3/4 thread forming screws

With Bearings:

• To press beaings 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-0030. For a 3/8" id, use am-0573.

Changes from 2007 FIRST Wheel

• More material has been added to each of the spokes, adding significant structural support
• More support for the bearing wall has been added
• A harder durometer rubber makes up the treads, providing less traction compared to the 2007 wheel
• Treads are a slightly darker color of gray