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With the implementation of the new national standards GB1589-2016 and 921, everyone has turned his eyes to the vehicle's self-respecting requirements. Each manufacturer has improved its body weight and tried every means to reduce its own weight, such as the use of aluminum alloy wheels and aluminum. Alloy fuel tanks and so on. However, some manufacturers have set their sights on the tires, using "big singletons" to reduce the weight of the car body and at the same time reduce fuel consumption.
GB1589-2016 replaced GB1589 in 2004, and at the same time made minor changes on the basis of the original regulations for large single tires. Each side was equipped with a single tire and the axle load was 7 tons. In the additional clause, the requirement for the use of tires with a width of more than 400 mm for non-drive shafts has changed to a tire with a cross-sectional width of not less than 425 mm. The maximum allowable shaft load limit is 10 t; for the drive shaft, the width of the tyre for installation is not less than 445 mm. The maximum allowable shaft load limit is 11.5t.
This new specification stipulates the use of large single tires on the drive shaft and the non-drive shaft. At the same time, the cross-sectional width of the tire must not be lower than the 425 tires currently used. For example, if a 4x2 tractor uses a large single tire to reduce its own weight, a wider section of 445mm tire must be used to ensure maximum load-bearing quality. However, this new requirement does not affect the existing large single tire models.
â— multiple large single bead <br> <br> saving advantages: single trailer tire into the tire from each side of the double cross-section becomes smaller while reducing friction with the ground. The rolling resistance of the vehicle is significantly reduced, helping to reduce fuel consumption. Two 295mm width tires became a 425mm single tire, and the width of the section was reduced by about 28%.
Weight loss: After the implementation of the New Deal in 921, truck weight reduction has become the focus. The purpose of using large single tires is to reduce the quality of the entire vehicle and to load more cargo.
Cheap: A 425/65R22.5 large single tire is different from the brand, although slightly more expensive than the same brand 295/80R22.5, but it is cheaper than buying two 295/80R22.5 tires.
â— advantages are numerous disadvantages can not be ignored <br> <br> braking distance is too long: when in fact the advantages of single births applications in turn is its shortcomings, the largest single tire reduces the contact area between the tire and the ground to save fuel, but it will lead to brake The braking distance is long, because the friction between the tire and the ground is not as great as that of the twin-tire model.
The stability is not good: In rain and snow, the lateral stability of the wet road surface will be weak, unless the vehicle is widening the frame for a single tire model to make up for this deficiency.
Insufficient carrying capacity: Single-tire models are not as good as twins, and are only suitable for standard transport under good road conditions. Vehicle use is limited.
Inconvenient maintenance: The failure of large single tires must be dealt with as soon as possible, and the number of tires for twin tires can be less worrying. Because of the lack of retention, supporting services are incomplete, and failures are difficult to find.
"Large singleton" is actually not new to us. As early as in previous years, "big singleton" has already appeared on the road, and the large single tires with particularly superior advantages have not been able to become mainstream. No fire. I wonder if the new GB1589 implementation this year will again promote the development of large singletons.
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