Product Description
8.5 X 4 X 4 Rubber W/Hub
Specifications: 8.500 inch diameter x 4.000 inch width (8.500" x 4.000" | 8.5 x 4 wheel | 8-1/2 x 4 | 215.90mm x 101.60mm)
Specifications
Wheel Specifications
| Outside Diameter (in) | 8.500 |
| Width (in) | 4.000 |
| Outside Diameter (mm) | 215.90 |
| Width (mm) | 101.60 |
| Drive Tire Profile | Smooth Flat |
| Material | Rubber |
Frequently Asked Questions
Q: What is the difference between SU 8.5 X 4 X 4-SF-R-A and the press-on versions?
A: SU 8.5 X 4 X 4-SF-R-A is a rubber wheel assembly with integrated hub. It is not a press-on design. Press-on versions (SF-R or SF-P) slip over an existing axle hub and are secured by friction. The -A suffix indicates this is a complete assembly ready to mount directly. Use the -A version if your truck needs a full wheel replacement with hub.
Q: Can I interchange the SF-R-A rubber assembly with polyurethane press-on wheels?
A: No. The SF-R-A is a complete wheel assembly with hub. Press-on wheels (SF-P models) require an existing axle hub to mount onto. If your truck uses the -A assembly type, you must stay with assembly versions. Mixing assembly and press-on styles requires different truck configurations and cannot be done without modifying the axle setup.
Q: What are the exact dimensions and weight rating for the SU 8.5 X 4 X 4-SF-R-A?
A: Outside diameter is 8.500 inches (215.90 mm). Width is 4.000 inches (101.60 mm). The smooth flat tire profile indicates a drive tire with no tread. Material is rubber. Check your truck documentation for load rating; these dimensions fit standard 24V to 48V electric lift trucks in the 4000 to 8000 lb capacity range. Always verify your specific truck model before ordering.
Q: How do I diagnose if the SF-R-A wheel assembly needs replacement?
A: Look for flat spots on the rubber, cracks, or chunks missing from the tire surface. Check if the wheel wobbles or does not spin freely. Test the truck on a level surface to see if it pulls to one side, which indicates uneven wear. If you cannot rotate the wheel by hand easily, the bearing is seized. Any of these symptoms means the assembly needs replacement. A worn rubber wheel loses traction and damages drive motors.
Q: Is installation of the SF-R-A plug-and-play or does it require modifications?
A: Installation depends on your truck design. If the axle currently uses a -A assembly, the replacement is typically a bolt-on swap. Drain or support the truck to lift the wheel clear. Remove retaining bolts or clips holding the old assembly. Slide the new assembly onto the axle hub and secure with original hardware. Do not overtighten bolts as this can crack the hub. Verify the wheel spins freely before operating the truck.
Q: What maintenance extends the lifespan of this rubber wheel assembly?
A: Keep the wheel clean by removing debris and buildup monthly. Check bearing lubrication if the wheel is squeaking or rough. Rotate trucks to avoid loading one wheel more than others if multiple trucks share the same path. Do not exceed the truck load capacity as this causes premature rubber breakdown and bearing wear. Replace if cracks appear because rubber deterioration accelerates once cracking starts. Average lifespan is 3 to 5 years depending on duty cycle and environment.
