Product Description
Load Wheel Assembly
Frequently Asked Questions
Q: What is the difference between SU 9129-XL-A and SU 9129-A?
A: Both are complete pre-assembled wheel kits with sealed bearings and hubs included. The difference is size: SU 9129-A is the standard assembly, while SU 9129-XL-A is the extended version with larger wheel diameter and tread width. Both mount to the same 20 mm bearing bore and fit trucks with matching axle specifications. Choose based on your truck model and application requirements.
Q: Do I need to modify the truck frame to install SU 9129-XL-A wheels?
A: In most cases, no. The SU 9129-XL-A retains the same 20 mm bearing bore and mounting points as the standard assembly. However, verify that the larger wheel diameter does not contact the truck frame, forks, or suspension components. Measure clearance between the wheel and frame on the truck before ordering. If clearance is less than 1 inch, consult the truck manufacturer or distributor to confirm XL compatibility.
Q: How is the SU 9129-XL-A assembly pre-lubricated?
A: The sealed bearing in the SU 9129-XL-A assembly arrives pre-lubricated and sealed from the factory. Do not add grease to the bearing. Apply light machine oil or chassis grease only to the axle contact surfaces before installation. The sealed bearing design eliminates periodic lubrication requirements and protects against dust and moisture intrusion.
Q: Can I use SU 9129-XL-A wheels on a truck originally equipped with standard SU 9129-A wheels?
A: Yes, if the truck has adequate frame clearance and your truck manufacturer approves the upgrade. The XL assembly uses the same 20 mm bearing bore and mounting system. However, you must install matching assemblies on all load wheels to ensure even wear and consistent handling. Never mix standard and XL wheels on the same truck. Contact the truck manufacturer to verify compatibility before purchasing.
Q: What is the expected service life of the SU 9129-XL-A assembly?
A: Expected service life is 2000 to 4000 operating hours or 1 to 3 years of typical warehouse use. Larger tread width may extend lifespan slightly due to reduced per-unit wear. Monitor tread depth and bearing condition every 500 operating hours. Replace the assembly if tread is worn to one-half original thickness or if bearing play develops. Sealed bearings cannot be serviced; replace the entire assembly when bearing failure occurs.
Q: Is the SU 9129-XL-A assembly more expensive than standard SU 9129-A?
A: Yes, the XL-A assembly typically costs 15 to 25 percent more than standard SU 9129-A due to larger wheel diameter and tread width. The premium cost is offset by improved floor protection and potentially extended service life on rough surfaces. For trucks operating on delicate or damaged floors, the XL-A assembly provides better load distribution and reduces floor damage risk at higher cost.