What is the meaning of all these numbers 2.75-18-42P written on my

CAMEL, How to read your tires code of motorcycles and bicycles

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MRF NYLOGRIP ZAPPER Y 2.75-18 Tubetype Tyre : : Car & Motorbike

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ARL 2.75-17 4PR NYL Star Rib Two Wheeler Motorcycle Tyre,Large : : Car & Motorbike

Michelin Pilot Street 2.75-18 42P

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What is the meaning of all these numbers 2.75-18-42P written on my bike tyre? - Quora