Question about 1994 Pontiac Sunbird

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Size of weels

Sir,
I have a pontiac sunbird 1994. (1998 cc )
During the last test , the tester notict that on the rear side of the car I have 2 new wheels size: P185/75R14 and on the front side of the car, the size of the 2 wheels is: P185/70R14
So he did'nt wanted to approve it. even I show him that on the front driver door it is manchaned that: on front the size should be P185/70R14, and on the rear should be P185/75R14 max.
on the car licence paper it is written: size of wheels: P185/70R14. (meastake?)
What is the real size permited for this model ? (I don't have the manuel of that car.)Thank you for your help !
IZAK e-mail: izakdur@012.net.il (Israel)

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Tire sizes are generally standard, however there are slight differences between brands. What is of primary concern is the rolling diameter of each tire. The numbers which you are tlaking about relate to "aspect ratio" (how wide a tire is in relation to its diameter) differing aspect ratios generally affect how wide the tire is. The numbers on the door sticker are correct, but it is generally better to have different #'s front to rear only on one axle. I would actually use the 70's on the rear, as they have a slightly larger "footprint" All told, the difference between your front and rear tires is so insignifigant, that it is almost laughable that anyone would even bother you about it! About the only place I know of that people are that uninformed and crazy is in California!!!
To check rolling circumference, park on a long flat place like a parking lot. Make a mark with crayon on the tire and on the ground as a starting reference. Roll the car 'till the mark on the tire is exactly down, where it began. Mark the ground at this point and measure the distance between both marks. Compare this both front and back. This difference is especially important with 4X4's where a difference can cause the transfer case to wrap up internally and fail. On a 2wd vehicle the difference means nearly nothing mechanically. As far as how wide a tire is, it only becomes critical when the tire is so wide that it interferes with the wheel well or rear suspension. Good luck with your crazy inspector!

Posted on Jan 28, 2009

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