Why Put Bigger Tires on Back of Car
Not all cars use tires of the same size for all four wheels. Some models, especially sports ones, have wider tires on the back. This is why some cars have wider tires on the back.
First of all, it must be said that unequal tires have other cars, even some that you would not suspect in any way sportiness. For example, the Smart Fortwo uses wider rear tires. So is the BMW i3, the first electric model of the Bavarians. However, the reasons why these cars have been fitted by the manufacturer with wider tires on the back is different from those for which, for example, a BMW M3.
Before we see why one car or another has equal or uneven tires, it doesn't hurt to look at the pros and cons of each configuration. As advantages of the classic configurations, in which all the wheels have tires with identical dimensions, we mention the simplicity in operation and the possibility to rotate the wheels periodically to ensure a uniform wear.
The advantage of uneven configurations is increased grip on the rear axle, which ensures better stability and traction (cars with wider tires on the rear are usually rear-wheel drive). Instead at high speeds the car can become understeer – the front of the car will tend to go out of the corner. For many, this behavior is preferable to the oversteer, in which the back of the car tends to go out of the corner, and a tête-à-queue is almost guaranteed.
Why some car manufacturers fit wider tires on the back
Returning to the title question, we believe that now you can find the answer yourself. Of course, the Smart Fortwo and BMW i3 do not rely on sports performance that must be maximized by the wider rear wheels. Both are heavy-duty cars (engines are located there), the wider wheels provide improved stability.
In the case of models with pronounced sporty performance, in addition to better cornering stability, the manufacturer wants to ensure improved traction and faster sprints. Even if that means it will change the most expensive tires in the car's configuration more often. In winter conditions, however, the configurations with wide tires on the back do not provide any advantage in terms of grip. In this case, the set of winter wheels should include identical tires.
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However, why don't manufacturers opt for equally wide wheels and front axles if this guarantees the best traction and grip? One reason would be the price – wide tires are much more expensive. Another reason would be the balance of the car – as I said the narrower front wheels will bring benefits to a car with a predominantly oversteer character. A third reason would be the turning radius – a tire that is too wide would prevent the wheels from turning completely – or complicate the architecture of the suspension to allow this.
Source: Promotor by www.promotor.ro.
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Why Put Bigger Tires on Back of Car
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