Product Description
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 is the difference between SU S446-XL and SU S446-XL-A and can I use them interchangeably?
A: Both wheels share identical dimensions: 3.25 inch outside diameter and 4.31 inch width. The SU S446-XL-A is labeled as a poly load wheel, suggesting polyurethane compound, while the standard SU S446-XL uses Cushothane XL. The SU S446-XL-A typically costs more and offers superior durability. Check your truck application; if you need extended wheel life in high-cycle operations, choose the A variant. They are mechanically interchangeable if bore and width match.
Q: Does the SU S446-XL-A include a pre-installed bearing or do I need to source one separately?
A: Based on available specifications, the SU S446-XL-A does not appear to be pre-assembled with a bearing. You will need to transfer existing bearings from your old wheel or purchase new sealed bearings matching the 2.07 inch bore outside diameter. Verify bearing width and load rating with your supplier before installation. Mismatched bearings cause binding or premature failure.
Q: What loading and operating conditions is the SU S446-XL-A suitable for?
A: The SU S446-XL-A poly construction is rated for standard warehouse and light industrial pallet jack operations in temperature ranges 0 degrees to 50 degrees Celsius. Do not use on floors with fluids that attack polyurethane, such as strong solvents or certain oils. The wheel is designed for smooth to moderately rough concrete floors. For rough outdoor surfaces or extreme temperatures, consult Superior for alternative products.
Q: How often should I inspect or replace the SU S446-XL-A wheel during normal use?
A: Inspect wheels every 500 operating hours or monthly, whichever is sooner. Look for tread depth loss, cracks, flat spots, or hardening of the compound. Polyurethane wheels typically last 1500 to 3000 operating hours depending on load and floor conditions. Replace immediately if diameter falls below 3.0 inches or if tread loss exceeds 25 percent of original depth. Worn wheels reduce maneuverability and increase operator fatigue.
Q: Can I clean or restore a SU S446-XL-A wheel if it becomes slippery or dirty?
A: Yes. Clean wheels with warm water and a soft brush to remove dirt and dust that reduce grip. Do not use harsh solvents, bleach, or pressure washers above 80 PSI, which can degrade polyurethane. Allow wheels to air dry completely before use. If wheels remain slippery after cleaning, the compound may have glazed or the floor may be wet; do not continue operation until wheels dry or compound is restored. Glazed wheels require replacement.