Which of the following may be the result of too high pressure in the motorcycle tyres?

This question is about the effects of too high pressure in motorcycle tyres. The result is reduced braking efficiency - answer A.

The Road Traffic Act requires a vehicle to be kept in a condition that does not endanger safety, and the tyres are its only contact with the road. An over-inflated tyre becomes hard and rounded: it touches the road surface only with a narrow strip in the middle of the tread, so the grip area gets smaller. Less grip means a longer braking distance and easier locking of the wheel, especially in the wet and on uneven surfaces, where a stiff tyre bounces off the road instead of staying in contact with it - so answer B is the opposite of the truth. The motorcycle also handles nervously, and the middle of the tread wears faster. A reduction in air resistance (answer C) has nothing to do with tyre pressure; only the rolling resistance is slightly lower, but at the cost of safety. You set the pressure according to the manufacturer's instructions, measuring it on cold tyres - in hot weather and after riding it rises by itself by a few tenths of a bar, and you do not correct this.

Legal basis: Art. 66 para. 1 point 1 of the Road Traffic Act (Prawo o ruchu drogowym); § 11 para. 5 of the Regulation on the technical conditions of vehicles and the scope of their necessary equipment