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Old 09-14-2011, 06:30 PM   #1
bomberro71
 
Drives: 2010 camaro ss
Join Date: Aug 2011
Location: Smith River
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Tires

I just bought some 22x9 and 22x10. What should the tire sizes be? Im thinking for the 22x9= 265x35x22 and 22x10= 285x35x22. Idk if i should go with a lower side wall with 30 please help me out it would be most appreciated.
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Old 09-14-2011, 08:05 PM   #2
Sterling


 
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Lets look at how tire sizes are measured...

The first number is the tire width in milimeters.
The 2nd number is a % of that width.
The third number is the diameter of the rim in inches.

1 inch = 25.4mm

Lets convert everything to mm and look at the stock tires...

Front 8" rim has 245/45ZR20
That tire is 245mm wide, and 110.25mm tall(245 x .45) with a diameter of 728.5mm(110.25mm sidewall x 2 + 508mm rim diameter)

Rear Stock 9" rim has 275/40ZR20
That tire is 275mm wide, 110mm tall(275 x .4), with a diameter of 728mm(110mm x 2 + 508mm)

If you want to keep similar ride height we need to try and keep the replacement tires diameter near 728mm's(28.66 inches)

The tires you asked about:
265/35ZR22 are 744.3mm (29.30 inches)
285/35ZR22 are 788.3mm (31.03 inches)
These tires are taller in diameter, relative to the stock tires and will decrease performance and the rear tire is 1 3/4 inches taller than the front one which may cause Stabilitrack/Traction Control issues.

I would suggest:
265/30ZR22 which are 717.8mm (28.25 inches)
295/25ZR22 which are 706 mm (27.79 inches)
These are slightly shorter in diameter than stock which will help lower your gear ratio to make up for increased weight of the bigger rims and are a fairly close match in diameter so it shouldn't cause Stabilitrack/Traction Control issues. These sizes are availible from tirerack as Pirelli PZero Nero's.

You can play around with the math, but from the availible sizes for a 22" rim these look like the best match to me.

Last edited by Sterling; 09-14-2011 at 08:48 PM.
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