The spare wheels appeared almost immediately with the appearance of the cars themselves. The first vehicles had to travel on one road with horse carriages, and the lost nails from horsepower were "caught" at every step. That's why the wheel puncings was a daily routine, and no one was surprised by the repairs on the road.
For the first time, the spare wheel was picked up by the cars of the U.S. brand Rambler at the beginning of the 20th century. The idea was so successful that it was "spare", that is, collected and inflated wheels began to pick up their cars. Incidentally, in the 20s, it was often not one but two or more spare wheels.
The spare wheel is in the picking of any car these days. Moreover, in many countries, the sale of vehicles without "odour" is prohibited by the security regulations that have the status of law. However, the choice of the wheel type remains the manufacturer. It could be a full-sized spare wheel as well as a dockette. In addition, the role of "spare wheel" can be performed by a special gel for rapid repair of the puncfield. In the case of a Runflat tyre, the spare wheel is not required, as buses of this type allow to get to the repair site even if the wheel has been lowered.
What's different than a spare wheel?
Daughter-a spare wheel of a normal or smaller diameter, but with a "native" boarding hole on the hub under the crepeg. The brine of the drivefrink is much already established, as is the tyre to which it is equipped. Unlike a full-size wheel, it is not intended for long-term operation, but it allows to get its way into the binomable. Speed limits shall be introduced when the speed limit is reached-not more than 80 km/h. The escape of more than 80 kilometres is also not recommended-the fact is that the narrow tyre is heating up by increasing the unit load per unit of space. Prolonging on a drivelling other than speed limits, it also makes a noticeable discomfort in driving the car due to the changed geometry of the suspension.
The English believe the spare wheel was invented by Walter and Tom Davis from Wales in 1904. Their company was called Stepney. This word is still rarely called a spare in former colonies
Automakers and car owners have a mixed attitude to this type of smell. The same model can be equipped with both a full-size wheel and a dockable (mainly a full-sized spare wheel is equipped with vehicles designed for the Russian market). The indisputable advantage of the milkette is that it occupies far less space in the trunk. As a rule, the milkette is placed in a niche beneath the raised floor of the trunk, without reducing its volume. This type of spare wheel is particularly relevant in small cars, such as a golf course, with low clearance and a fuel tank.
Full-dimensional smell and difference
Full-sized spare wheel is no different from normal wheels. Moreover, since 2014, there is a rule that requires the change of rubber on the spare wheel of the season. The lack of full-dimensional spare parts is that its location, especially when the car is manned by large wheels of large diameter, requires a lot of space. In addition, a full wheel has a large weight and only a man can extract it from a niche under the floor of the boot.
How's the "right" ride on the dockette?
To minimize the undesirable effects of using a do-com, you need to know the behavior of the car with the front, rear, or full drive. In the case of a front-wheel-drive vehicle, experienced drivers are advised to install a rear axle (especially if the driverless drive is smaller than the drives installed in the car). The rear wheels are free to rotate and do not relate to each other, so the installation of a smaller rear axle spare wheel will not lead to significant changes in stopping distance and controllability.
The use of a smaller diameter on a motor vehicle is strictly prohibited. The result can be a breakdown of the differential, especially the [ [ Electron Controlled]]
The situation is slightly different for rear actuators. If the size of the stopping distance is important, the rear axle should also be added. If you have to use a wintertime during the winter on the icy road, and the snow tyres are installed on the car, it is better to put it on the front axle and do not disconnect the stabilisation system and other "electronic assistants", if any.
Duck movement considerations
If it is necessary to use a driverless road on a busy road, the driver will have to take the right row after the wheel has been replaced so as not to interfere with other participants.
It should always be remembered that a drier is a wheel with smaller diameter and increased pressure, which creates some problems. First, it increases the load on the differential (increasing the ratio of angular velocity on the axis where the dink is fixed). Secondly, due to the decrease in the contact's stains on the road surface, the length of the stopping distance increases and the controllability is reduced. Third, the reduced diameter of the drive is perceived by the ABS electronic systems, ESP and others as slips and may cause disruption to their work.
In the English-speaking countries, the dockatcom is called "doughnut", that is, "doughnut." In Russia, they prefer the words "pill" or "banana" because of the orange warning color of the disc
When the difference between the diameter of the wheels and the millet is small, the differential may not be concerned, because the small difference in angular velocity may be negligible. In this case, the support systems will continue to operate in normal mode, helping the vehicle when passing through and during braking.
When there is a noticeable difference in diameter (say, 13 "dotcom" and "16" full-time wheels), it is best to shut down the electronic systems for safekeeping. If you leave the stabilization systems on, there will be a periodic lock on the axis where the spare is mounted. The control unit will assume that the wheels of the movement have different coefficient of adhesion to the road.
A significant difference in diameter will affect the differential pressure and lead to conditions that contribute to increased wear.
Completing a serious SUV is almost impossible because of the high centre of gravity and the heavy weight of the car
Even when the difference in diameter is small, don't forget that the car is actually not usable and is only suitable for moving to a place of repair. First, the speed of more than 80 km/h can be dangerous, second, the stopping distance increases, and third, the machine may become less manageable when passing the corners.
The main thing to remember is that the drivage is a temporary, auxiliary element of a car, and it has become, and the inconvenience of its exploitation is also temporary.
