Why do some trucks have a spare set of wheels hanging? Wouldn’t it better to just have all the wheels on the road?
In: 159
Less wear on the tyres and bearings on the raised wheels. They are only needed to bear extra weight so when it is light they raise them for less wear and tear. It might not sound like much but they can do half the distance of the other wheels in some circumstances and if they are driving thousands of kilometres it makes a big difference.
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