Product Description
Load Wheel
Frequently Asked Questions
Q: What is the difference between SU 359 wheel and SU 359-A assembly?
A: SU 359 is a replacement wheel only, used when your existing hub and axle are still good. SU 359-A includes the wheel, hub, bearings, and all fasteners as a complete assembly. If your hub is damaged or bearings are worn, you need SU 359-A. If only the rubber is worn, order SU 359 wheel and reinstall it on your existing hub.
Q: Can I use SU 359 wheel to replace a worn SU 375 wheel?
A: No. SU 359 and SU 375 have different hub diameters and bolt patterns. Forcing a SU 359 onto a SU 375 hub will not seat properly and the wheel will wobble or separate under load. Always verify your part number matches your truck specifications before ordering.
Q: How do I install a SU 359 wheel on my existing hub?
A: First, clean the hub bore with a cloth to remove dirt and rust. Insert the wheel onto the axle and slide it fully onto the hub. Align the bolt holes and install fasteners hand-tight, then torque in a star pattern to 45 foot-pounds. Rotate the wheel by hand to confirm smooth operation. Do not over-torque or you will compress the rubber compound and reduce wheel life.
Q: What load capacity does SU 359 wheel support?
A: SU 359 wheels support up to 9,000 pounds per wheel depending on your truck model and whether load is distributed across front or rear wheels. Consult your truck manual for specific load rating. Exceeding the rating causes premature wear, flat-spotting, and possible rubber delamination.
Q: How often should SU 359 wheels be inspected for wear?
A: Inspect SU 359 wheels weekly for visible tread wear, cracks, or debris embedded in the rubber. Measure tread depth monthly with a caliper or tread depth gauge. Replace when depth reaches 0.25 inches or if you notice flat spots, chunking, or uneven wear patterns. Worn wheels reduce truck control and increase accident risk.
Q: Why does my SU 359 wheel have a flat spot after storage?
A: Flat spots develop when a loaded truck sits in one location for more than a few weeks. The wheel rubber sets in a compressed state and does not fully recover. Operate the truck for 10 to 20 minutes at normal speed to re-warm the rubber and allow it to re-round. Persistent flat spots that do not disappear after operation indicate permanent deformation and the wheel should be replaced.