The front axle of my Nissan Fairlady 350 Z came fitted with Bridgestone Potenza RE 050A 245/35/R19/93 Y while the rear axle, all else the same, with 275/35/R19/93Y. As I understand it when browsing the Bridgestone website, the RE 050 signifies the type of tyre and the A signifies that its tread pattern is asymmetrical. The 245 or 275 means a tyre width of 245 mm or 275 mm as the case may be. The 35 is the percentage ratio between the height and the width. It is also called the Aspect Ratio. The R means radial tyre and the 19 signifies the rim diameter in inches, which in this case is 19". The 93 means the load rating in kg (?) that the tyre can bear while the Y signifies that the tyre can withstand a speed of 300 km per hour.
As for the grey 10-spoked rim, I have yet to determine whether it's from Rays or from some other makes. I have not obtained any information on what the correct tyre pressures are for the tyres. The manual describes tyre pressure as 240 Kpa for both front and rear but that is for the stock tyres 225/40 and 245/40 on 17 or 18 inch rim.
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