Winter Michelin tyre size 275/40 R21 107V with N0 marking for high performance SUVs. The Pilot Alpin 5 SUV XL tyre has a tread depth of 5.0mm and a rim diameter of 21 inches. It offers good wet grip performance, fuel efficiency, and a maximum inflation pressure of 50 psi. The tyre is not run-flat and produces an external rolling noise of 74 decibels.