If you are talking about the "Z" after the "Rev" in then you are way off base, that is just part of the tyre branding. The Fazer/FZ-16 tyre is wholly inadequate for the speeds a Ninja 300 capable of. As far as I'm aware, the real rating of the tyre is "63P", that would be the load index followed by the speed rating.
The tyre's specifications (140/60 R17 63P) are actually:-
140 = The width of the tyre in millimeters
60 = The height of the tyre in relation to the width (60% of 140 = 84mm.) Still 14mm shorter than a stock tyre, 98mm versus 84mm.
R = The tyre is of radial construction
17 = The rim diameter
63 = 272 kilograms of load
P = 150 kmph ( way below what the Ninja can do)
My earnest suggestion would be to immediately change the tyre if you plan on going anywhere near the Ninja's top speed. The tyre will be working beyond what it was designed for, and you do not want to be doing that lest it may lead to a blowout at speed and, god forbid, a crash.




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