Product Description
SU 528-XL is a polyurethane load wheel for electric lift trucks, manufactured by Liftsplus.com. The wheel features a 3-1/4 inch outer diameter, 6-3/8 inch tread width, and is constructed with a radius crowned polyurethane tread (95 Shore A) bonded to a precision-machined steel hub. Designed for axle mounting on standard electric pallet jack applications, the wheel incorporates press-fit precision ball bearings for smooth operation.
Specifications: 3.250 inch diameter x 6.375 inch width (3.250" x 6.375" | 3.25 x 6.38 wheel | 3-1/4 x 6-3/8 | 82.55mm x 161.92mm)
Specifications
Material & Construction
| Tread Material | Polyurethane, Shore A 95 hardness |
| Core/Hub Material | Cast steel |
| Surface Finish | Machined steel hub with factory-applied poly tread |
Wheel Dimensions
| Material | Cushothane XL |
| Outside Diameter | 3.25 |
| Inside Diameter | 1.938 |
| Width Side to Side | 6.375 |
| Bore Depth | 0.812 |
| Hub Width | 6.375 |
| Bore Outside Diameter | 2.0467 |
Frequently Asked Questions
Q: What does the XL designation mean on SU 528-XL?
A: XL on SU 528-XL refers to the tread material formulation: Cushothane XL polyurethane with 95 Shore A hardness rating. This is a higher-hardness tread compared to standard polyurethane, designed for rougher warehouse floors, outdoor concrete, and higher-mileage applications. The wheel dimensions remain 3.25 x 6.375 inch.
Q: Is SU 528-XL compatible with standard SU 528 pallet jack applications?
A: Yes. SU 528-XL has identical 3.25 x 6.375 inch external dimensions and bore specifications as standard SU 528. Both are press-fit wheels with sealed ball bearings. SU 528-XL is a direct mechanical replacement for SU 528. The XL tread is simply a harder formulation for extended life in demanding environments.
Q: When should I use SU 528-XL instead of standard SU 528?
A: Use SU 528-XL when wheels must endure rough concrete, outdoor dock areas, or high-cycle warehouse duty. The 95 Shore A hardness resists tread wear and chunking longer than softer formulations. Standard SU 528 is adequate for smooth indoor floors. If trucks are getting 2 to 3 years from standard wheels, upgrade to SU 528-XL for 4 to 6 year lifespan.
Q: What is the load rating for SU 528-XL?
A: The SU 528-XL load capacity is determined by your electric lift truck model, not the wheel alone. The wheel is rated for the truck manufacturer us duty cycle. Do not exceed the truck nameplate weight rating. The 95 Shore A hardness tread is rated for smooth warehouse floors and light outdoor use. Do not use on inclines exceeding the truck design angle.
Q: How does 95 Shore A hardness affect wheel performance?
A: 95 Shore A polyurethane is significantly harder and more wear-resistant than softer formulations. It reduces tread wear by 30 to 50 percent in high-cycle applications. The tradeoff is slightly reduced grip on smooth floors and a harder ride quality. On slippery surfaces like polished concrete, higher Shore A can reduce traction. Test on your specific floor conditions before full fleet deployment.
Q: Can I apply a softer tread over the SU 528-XL or refinish the top layer?
A: No. The SU 528-XL tread is bonded to a machined steel core and cannot be refinished, ground, or overlaid. Attempting to grind or resurface the wheel will remove the bonded tread layer, destroying the wheel. If the tread wears out or if you need a softer compound, replace the entire wheel. Do not attempt field modification.