Product Description
Load Wheel Assembly
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 SU 446-XL-A and how does it differ from SU 446-A?
A: The SU 446-XL-A is a complete assembly with the Cushothane XL wheel (not standard Cushothane) paired with hub and bearings. It is identical to SU 446-A in form and installation, but uses premium XL material for longer life. Choose SU 446-XL-A for heavy-duty applications.
Q: Are SU 446-XL-A dimensions identical to SU 446-A?
A: Yes. Both assemblies are 3.25 inches diameter x 4.31 inches width with identical bore dimensions and hub widths. The SU 446-XL-A is a direct bolt-on replacement for SU 446-A. No modification or adjustment is needed.
Q: Is installation of the SU 446-XL-A different from SU 446-A?
A: No. Installation is identical. Remove the axle pin, slide off the old assembly, slide on the SU 446-XL-A, and secure the pin. No press, special tools, or frame modification required. Installation takes 5-10 minutes per wheel.
Q: Can I use SU 446-XL-A as a direct replacement for worn SU 446-A wheels?
A: Yes. The SU 446-XL-A is a full upgrade path from SU 446-A. If your SU 446-A wheels are wearing quickly, switching to SU 446-XL-A on the next replacement cycle will extend intervals between service calls by 40-60 percent in most operations.
Q: What is the typical lifespan of the SU 446-XL-A assembly?
A: With heavy daily use (40+ hours per week) on rough surfaces, expect 3-4 years. With moderate indoor use, 4-6 years is typical. The sealed bearing design is maintenance-free. Most failures occur in the wheel material, not the hub or bearings.
Q: Is the cost difference between SU 446-A and SU 446-XL-A justified?
A: If your truck operates in heavy-duty service (outdoor, rough surfaces, extended hours), the SU 446-XL-A delivers lower total cost of ownership. Calculate your truck downtime cost per hour and compare: longer wheel life reduces unplanned maintenance and labor costs that often exceed the wheel price difference.