Automobile Engineering in ME
Wheel base of a vehicle is the

Distance between the centres of the front tyres
Distance between the centres of the rear tyres
Extreme length of the vehicle
Distance between the centres of the front and rear wheels

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Automobile Engineering in ME
The main function of the tread pattern on tyre is that

In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The tread pattern protects the tyre's inner carcass from small stones and pieces of glass
The crests between the tread grooves absorb road noise
The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating

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