Product Description
Rubber Press-On
Specifications: 21.000 inch diameter x 8.000 inch width (21.000" x 8.000" | 21 x 8 wheel | 21 x 8-0 | 533.40mm x 203.20mm)
Specifications
Wheel Specifications
| Outside Diameter (in) | 21.000 |
| Width (in) | 8.000 |
| Outside Diameter (mm) | 533.40 |
| Width (mm) | 203.20 |
| Drive Tire Profile | Smooth Flat |
| Material | Rubber |
Frequently Asked Questions
Q: What dimensions does the SU 21X8X15-SF-R rubber wheel provide?
A: The SU 21X8X15-SF-R is a 21.000 inch diameter rubber press-on wheel with 8.000 inch width, equivalent to 533.40mm diameter x 203.20mm width. This wider width provides better load distribution than the 21 x 7 variant.
Q: Can the SU 21X8X15-SF-R replace a narrower 21 x 7 wheel on the same truck?
A: Only if your axle is wide enough to accommodate the additional 1.000 inch width and clearance exists on both sides of the wheel. Do not force an 8-inch-wide wheel onto a 7-inch axle. Measure your current axle width and hub spacing before ordering. Improper fitment causes uneven loading and premature failure.
Q: What is the profile type for the SU 21X8X15-SF-R?
A: The SU 21X8X15-SF-R has a smooth flat drive tire profile designed for standard floor applications. The rubber compound is engineered for electric lift truck indoor use with consistent contact across the wheel face for stable steering and load handling.
Q: How do I diagnose steering problems that might be caused by the SU 21X8X15-SF-R wheels?
A: First, jack up the truck and spin each wheel freely by hand to check for runout or binding. Watch for flat spots or wobbling. Next, inspect the rubber surface for chunks missing or deep cracks that could catch on the floor. Finally, check if both drive wheels have the same wear pattern. Uneven wear indicates axle alignment issues, not wheel defect.
Q: Is the SU 21X8X15-SF-R rated for outdoor or indoor use?
A: The SU 21X8X15-SF-R is designed for indoor smooth-floor applications such as warehouses, manufacturing facilities, and retail environments. Do not use outdoors or on rough surfaces. Outdoor and uneven surfaces degrade rubber compound faster and void warranty coverage.
Q: What is the typical lifespan of the SU 21X8X15-SF-R before replacement?
A: Under normal duty conditions with 8 to 10 hours daily operation, the SU 21X8X15-SF-R wheel lasts 2 to 4 years. Heavy use, elevated temperatures, or corrosive environments shorten lifespan. Monitor rubber condition monthly and replace when thickness drops below 0.25 inches from the original, typically between 18 to 36 months depending on load and usage.
