Product Description
3.25 X 4.3 Poly Load Wheel
Specifications: 3.250 inch diameter x 4.310 inch width (3.250" x 4.310" | 3.25 x 4.31 wheel | 3-1/4 x 4.31 | 82.55mm x 109.47mm)
Specifications
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 3.25 |
| Inside Diameter | 1.875 |
| Width Side to Side | 4.31 |
| Bore Depth | 0.2 |
| Hub Width | 4.31 |
| Bore Outside Diameter | 2.07 |
Frequently Asked Questions
Q: What are the specifications of the SU S446 wheel?
A: The SU S446 is 3.250 inch diameter by 4.310 inch width (82.55mm x 109.47mm metric). The bore is 2.07 inch outside diameter with 0.2 inch bore depth. Inside diameter is 1.875 inch and hub width is 4.310 inches. The tread is Cushothane XL polyurethane.
Q: How does the wider 4.31 inch width of the SU S446 affect load capacity compared to narrower wheels?
A: The wider 4.31 inch width distributes the load across a larger contact patch, reducing ground pressure and improving stability. This is beneficial for uneven floors or loads with high tilt angles. However, load capacity is ultimately determined by the truck frame and axle rating, not wheel width alone.
Q: Is the SU S446 interchangeable with the SU S446-A?
A: The SU S446 is the wheel only, while SU S446-A is a complete wheel assembly. If your truck already has hubs and bearings installed, you can use the SU S446 wheel. If you need a ready-to-install assembly or lack existing hub components, order the SU S446-A instead.
Q: What tools and precautions do I need to replace the SU S446 wheel?
A: You will need a socket wrench or open-end wrench (size depends on your spindle fastener), a jack or lift to raise the truck, and wheel blocks or chocks for safety. Always secure the truck on a level surface, block the wheels, and lower the truck slowly. Wear safety glasses and ensure no personnel are under the truck.
Q: When should I replace the SU S446 wheel?
A: Replace the SU S446 when tread depth is less than 3/8 inch, when chunks of polyurethane are missing, when the wheel shows visible cracks, or when steering becomes difficult or notchy. A worn wheel reduces load stability, increases stopping distance, and can damage floors.
Q: What is the benefit of the 0.2 inch bore depth on the SU S446?
A: The 0.2 inch bore depth seats the wheel against the spindle shoulder, providing a positive stop and ensuring proper wheel alignment. A shallow bore depth reduces the risk of the wheel sliding axially during operation and keeps load balanced on the bearings.