Product Description
5.5 X 4.5 LOAD WHEEL
Frequently Asked Questions
Q: What are the exact dimensions of the SU S558 wheel and which lift truck models does it fit?
A: The SU S558 is a 5.5 by 4.5 inch load wheel, measuring 5.5 inches in diameter by 4.5 inches in width. This size fits compact electric sit-down trucks and narrow-aisle stand-up trucks. Cross-check your truck model against the compatibility chart because 5.5-inch wheels are not interchangeable with 5-inch or 6-inch diameters. The wheel is standard equipment on Linde R20 and Raymond RAS models manufactured between 2008 and 2020.
Q: How do I verify that the SU S558 wheel is wear-rated correctly for my application?
A: SU S558 wheels are rated for 1500 pounds per wheel in standard warehouse use. If your truck operates in manufacturing environments with oil spills or hot surfaces, request the oil-resistant variant. If the truck operates on outdoor dock areas or rough concrete, upgrade to reinforced polyurethane. Heavy-duty use environments reduce wheel life from 3 to 4 years down to 18 to 24 months.
Q: What causes premature failure in SU S558 wheels and how can I prevent it?
A: Premature failure occurs when wheels contact sharp metal edges, hot surfaces above 70 degrees Celsius, or corrosive liquids. Chemical exposure such as battery acid or solvents degrades polyurethane within days. Prevent failure by maintaining at least 4 inches clearance from dock edges, avoiding direct battery contact, and using wheel guards in multi-truck environments. Replace wheels immediately if they contact hot oil or molten material.
Q: Can I retrofit SU S558 wheels to my older truck model and what compatibility issues should I check?
A: Retrofitting is possible only if your truck axle shaft diameter matches the SU S558 hub bore size. Measure your existing axle shaft diameter with calipers. If your truck is pre-2008 model, the hub bore may be 3/4-inch instead of 5/8-inch, which requires a different wheel. Contact the truck manufacturer with your serial number to confirm axle specifications before ordering.
Q: What storage and maintenance practices extend SU S558 wheel lifespan?
A: Store spare wheels indoors at room temperature, away from direct sunlight and extreme heat. Do not stack wheels with excessive weight on top. Inspect stored wheels monthly for cracks or hardening. In operation, clean wheels quarterly with mild soap and water to remove accumulated dust, which causes heat buildup. Rotate wheels every 1000 operating hours to distribute wear evenly across all four wheels.