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C1Difficulty 2/5

Between a tyre with the nomenclature 295/80 R22’5 150-146 N and another 295/80 R22’5 150-146 M, what difference can we find?

Correct answer

They have different maximum speed limits.

In the codes of a tyre's nomenclature, the last code, which is a letter, indicates the speed index, that is, the maximum speed that tyre can withstand. (Example: code M: 130 km/hour and code N: 140 km/hour.)

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  • One has an inner tube and the other doesn't.

  • They have different maximum speed limits.

  • They have different load indices.

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