Commercial trucks for you hard work has used two wheels on each side of the axis (not the axis of rotation) for the past 100 years, to increase capacity and keep driving the car in case you experience a tire puncture. Using two wheels on each side of the axis, almost doubles the weight that can charge the vehicle, allowing three tires inflated properly bear the burden, if a puncture or air loss of a wheel.
Cars recreational homes (RVs, for its acronym in English) continue to travel on U.S. highways and picops commercial vehicles have evolved to work hard everyday driving vehicle, which occasionally tow other vehicles for entertainment or hobbies. Many recreational vehicles and picops 3 / 4 and 1 ton, dual wheels used in rear axles. By using the same tire size and wheel in the steering axle and dual tires and wheels in the rear axle, the load capacity increases. In addition, the wheels can be rotated periodically, and the vehicle must have only one spare wheel.
However, to accommodate dual tires, these vehicles have wheels, special front and rear axle. All wheels are “offsets” ends that allow them to be installed center-to center on the rear axle. Indeed, the inner rim uses an “offset” extremely positive, to allow the wheel is normally located on the axis (back in), the wheel on the outside, use “offset” extremely negative and is installed in axis with its center near the inner wheel and the inside looking out.
The width and the offset of the wheel is carefully manufactured for the vehicle and tire size used. This allows compliance with the requirements of the vehicle at the same time, maintain sufficient space between the pairs of wheels on the rear axle and prevent them to rub to bear the maximum load when cornering or tripping over big obstacles.
While both shafts are super strong and use 8 bolts, front axle is longer than normal to accommodate wheels with “offset” extremely positive. The size of the rear axles can locate a pair of wheels on each side, between the internal frame of the vehicle and the extended fenders on the outside.
Because, keep the space between the two wheels is very important (avoid rubbing or debris from the road are located in the middle), the tire size or the vehicle can not be enlarged. Even some cars with original tires (OE, for its acronym in English) will not allow the use of snow chains.
Also bear in mind to use tires equivalent to the rear axle. Ideally, the tires are the same model and have the same depth on the surface of the tread. Any difference between the four tires, the tires will result in higher support more weight than others.
Light duty truck tire that are used in axles with four wheels, with two brands of maximum load capacity (Max Load) in the side or wall. This is because the load capacity of a tire “double” used in a two-wheel axle is greater than if you use a hub with four wheels. For example, a tire size and load capacity LT235/85R16 E (Load Range E), is marked to support the 3.042 pounds and inflated to 80 psi using a two-wheel shaft, whereas when used in a shaft four wheel at the same air pressure only support 2.778 lbs.
This reduction in carrying capacity results in slightly larger tires, specified for vehicles that can withstand the additional stress experienced by a flat tire. The rest of the wheels should be properly inflated to support the load at a reduced speed and avoid any immediate danger. This reduction is not a problem for vehicles equipped with dual tires on the rear original because the manufacturer has considered the situation when the tire size specified for the vehicle.
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