FIRST Tech Challenge Note: This product is NOT legal for FTC. We recommend our Stealth Wheel for applications where digging into the surface is a concern.
This is a 4 inch diameter wheel with HiGrip tread. The design of this wheel is very similar to our popular 6" HiGrip wheel, but with a smaller, 4" diameter. We feel that these wheels are a more durable option for teams' drivetrains. While they provide good traction, they make for a maintenance-free wheel for the average team. Under normal circumstances, we feel that these wheels will last most FIRST Robotics Competition teams the entire season. No bearings or hubs are included in this wheel.
- Diameter: 4 inches
- Body Material: Polycarbonate, black
- Tread Material: TPU (thermoplastic polyurethane)
- Bore: 0.95"
- Width: 1.375"
- Weight: 0.31 pound
- Bolt Pattern: six holes (0.17 inch diameter) on a 1.875 inch diameter bolt circle
- Static coefficient of friction on tight pile carpet: 1.07
- Static coefficient of friction on HDPE: 0.31
- Load capacity: 100 pounds
Use #10-24x3/4 thread forming screws to attach sprockets or hubs to this wheel. Many thread locking materials are not compatible with polycarbonate and can eat away at the plastic. Be sure to check which adhesives are okay to use with this product. This link will allow you to check which materials are okay to use with what adhesives, http://bit.ly/loctitematerialcheck
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.
- 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.
- 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.