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How do rim specifications come into play?
2025-09-28
The specifications for OTR (off-highway) rims are more complex than those for standard automotive rims because they must withstand significant loads and harsh operating environments. Rim specifications are crucial parameters that influence vehicle performance, safety, and aesthetics. These specifications collectively determine whether the rim can be properly installed on the vehicle and how it will affect the vehicle's driving characteristics.
The following are several key parameters in rim specifications and their functions:
1. Rim size
The diameter of a rim is usually measured in inches. For example, an 18-inch rim is 18 inches in diameter . The rim diameter directly determines the size of tire you can fit.
Larger diameter rims usually mean thinner tire sidewalls , which provide a clearer road feel and better handling, but may reduce ride comfort and make the tire more susceptible to damage on bumpy roads.
Smaller diameter rims are suitable for thicker tire walls, which can provide better cushioning and a more comfortable ride, but the handling is relatively poor.
2. Rim width
Rim width is also measured in inches, usually expressed as "J." For example, a 7.5J rim is 7.5 inches wide. The rim width must match the tire width. If the rim is too wide or too narrow, the tire will not fit properly or its performance will be affected.
Matching the right tire rims can ensure that the tire tread can contact the ground evenly and provide the best grip.
A rim that is too narrow will cause the center of the tire tread to bulge, reducing grip and potentially making the tire unstable when cornering at high speeds. A rim that is too wide will cause the tire shoulder to stretch, also affecting grip and potentially increasing the risk of tire and rim damage.
3. Rim center hole diameter
The center hole is the hole in the center of the rim that is used to center the axle. Its diameter is measured in millimeters. It ensures that the rim is precisely aligned with the axle and prevents wobbling during driving.
of the right size fits tightly with the axle, ensuring that the rim is installed correctly and smoothly, avoiding unbalanced shaking of the wheel at high speeds.
If the center hole is too large, the rim cannot be accurately positioned. Although this can be compensated by a hub ring, it may still cause wheel vibration if it is not installed properly.
4. Offset
Offset, also known as ET, is the distance between the rim's mounting surface and the rim's centerline. It's measured in millimeters and can be positive, negative, or zero. Offset determines whether the rim sits more inward (closer to the car body) or outward (protruding) when installed.
A large ET value (positive offset) causes the rim to be further inward, potentially causing the rim and tire to scrape against the vehicle's suspension or brake calipers. A small ET value (negative offset) causes the rim to be further outward, widening the vehicle's track and improving cornering stability. However, if the ET value is too small, the tire may protrude from the vehicle, increasing the risk of mud and water splashing or scraping against the wheel arch.
5. Hole distance (PCD)
The hole spacing, also known as the pitch diameter, is the diameter of the circle formed by the bolt holes on the rim. For example, 5x114.3 indicates five bolt holes with a pitch of 114.3 mm. This is the most basic parameter for ensuring that the rim can be installed on the vehicle.
The hole spacing must match the bolt hole position on the vehicle's wheel hub exactly, otherwise it will not fit at all. This is the first parameter to be confirmed when modifying the rim.
These specifications are interrelated to ensure a perfect fit between the tire and the vehicle, improving load-bearing capacity, operational safety and economy.
As China's leading off-road wheel designer and manufacturer, HYWG is also a world-leading expert in rim component design and manufacturing. All of its products are designed and produced to the highest quality standards.
With more than 20 years of deep cultivation and accumulation, we have served hundreds of OEMs around the world and are the original rim supplier in China for well-known brands such as Volvo, Caterpillar, Liebherr, and John Deere.
We have a long history of designing and manufacturing high-quality rims for a variety of off-highway vehicles. Our R&D team, comprised of senior engineers and technical experts, is focused on the research and application of innovative technologies, maintaining our leading position in the industry. We have established a comprehensive after-sales service system, providing timely and efficient technical support and after-sales maintenance. Every process in our rim production adheres to strict quality inspection procedures, ensuring that each rim meets international quality standards and meets customer requirements.
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Bead seat circumference inspection -
Bolt hole inner diameter inspection -
Color PT inspection of straight welds
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Dial indicator to detect product runout -
External micrometer to detect internal micrometer to detect the inner diameter of the center hole -
Non-destructive testing of product weld quality
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Outside diametermicromete to detect position -
Radial assembly height inspection -
Radial thickness inspection
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Colorimeter to detect paint color difference -
External micrometer to detect internal micrometer to detect the inner diameter of the center hole -
Outside diametermicromete to detect position
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Paint Adhesion - Cross-cut Test -
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Paint film thickness meter to detect paint thickness
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Paint hardness-test -
Screw hole inner diameter inspection -
Spoke distance
We have extensive involvement in the fields of construction machinery, mining rims, Forklift Rims, industrial rims, agricultural rims, other rim components and tires.
The following are the various sizes of rims that our company can produce in different fields:
Engineering machinery size:
| 8.00-20 | 7.50-20 | 8.50-20 | 10.00-20 | 14:00-20 | 10.00-24 | 10.00-25 |
| 11.25-25 | 12.00-25 | 13.00-25 | 14:00-25 | 17.00-25 | 19.50-25 | 22.00-25 |
| 24.00-25 | 25.00-25 | 36.00-25 | 24.00-29 | 25.00-29 | 27.00-29 | 13.00-33 |
Mine rim size:
| 22.00-25 | 24.00-25 | 25.00-25 | 36.00-25 | 24.00-29 | 25.00-29 | 27.00-29 |
| 28.00-33 | 16.00-34 | 15.00-35 | 17.00-35 | 19.50-49 | 24.00-51 | 40.00-51 |
| 29.00-57 | 32.00-57 | 41.00-63 | 44.00-63 |
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Forklift wheel rim size:
| 3.00-8 | 4.33-8 | 4.00-9 | 6.00-9 | 5.00-10 | 6.50-10 | 5.00-12 |
| 8.00-12 | 4.50-15 | 5.50-15 | 6.50-15 | 7.00-15 | 8.00-15 | 9.75-15 |
| 11.00-15 | 11.25-25 | 13.00-25 | 13.00-33 |
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Industrial vehicle rim dimensions:
| 7.00-20 | 7.50-20 | 8.50-20 | 10.00-20 | 14:00-20 | 10.00-24 | 7.00x12 |
| 7.00x15 | 14x25 | 8.25x16.5 | 9.75x16.5 | 16x17 | 13x15.5 | 9x15.3 |
| 9x18 | 11x18 | 13x24 | 14x24 | DW14x24 | DW15x24 | 16x26 |
| DW25x26 | W14x28 | 15x28 | DW25x28 |
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Agricultural machinery wheel rim size:
| 5.00x16 | 5.5x16 | 6.00-16 | 9x15.3 | 8LBx15 | 10LBx15 | 13x15.5 |
| 8.25x16.5 | 9.75x16.5 | 9x18 | 11x18 | W8x18 | W9x18 | 5.50x20 |
| W7x20 | W11x20 | W10x24 | W12x24 | 15x24 | 18x24 | DW18Lx24 |
| DW16x26 | DW20x26 | W10x28 | 14x28 | DW15x28 | DW25x28 | W14x30 |
| DW16x34 | W10x38 | DW16x38 | W8x42 | DD18Lx42 | DW23Bx42 | W8x44 |
| W13x46 | 10x48 | W12x48 | 15x10 | 16x5.5 | 16x6.0 |
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Our products are of world-class quality.