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We would advise that for your Yamaha XJR 1300 if on tyre sizes front 120/70 ?€" ZR17 58W TL (tubeless) and Rear 180/55 ?€" ZR17 73W TL the tyre pressures (set when tyres are cold) should be as follows:-
Front ?€" 36 psi (pounds per square inch)
Rear ?€" 36 psi (pounds per square inch)
The wheels could have been changed on the car from the standard original factory set and hence the tyre size may not be the standard factory original size. The size of the tyres on the vehicle now is moulded into the side wall of the tyres and is easy to read. Check all 4 tyres because larger size tyres may have been fitted as a pair to the rear.
The size might read - for example 245 45 18 or 235 45 17 (there are a huge number of sizes for each model of tyre).
The first 3 numbers are the width of the tyres in mm eg 225 mmm or 235 mm and so on. The second 2 numbers are the tyre profile size or ratio (which can be 70 65 60 55 50 45 40 and so on. The third number is the wheel diameter size. If you have 18 inch wheels on the car the tyres will read 18 or if they are 17 inch wheels the tyres will read 17 and so on.
The tyre size is governed by the rim width and the space available in the wishbone. I would measure the space available for the tyres width right up inside the wishbone along with the tyre size that you have at present. The tyre can be oversized but watch out for slipping on the rim of the wheel! Consult a Yamaha Workshop for specialist tyre sizes and compounds. Pirelli make some super sticky tyres alowing for excellent high speed cornering!
You are governed by safety. The hub width will determine the maximum width and type of tyre as will the width of the rear suspension/wishbone. Consult a qualified tyre fitter for accurate sizes. Don't forget your speedometer will no longer be accurate!
yes it is just go to a tire shop that sells custom rims and tell them you would like to go bigger and they will tell you how big you can go ! hope this helps
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