Tires
Thread Starter
Le Mans Master
Joined: Oct 2008
Posts: 8,892
Likes: 981
From: Whitby Ont.
Tires
I have a chance at 2-275/35 18s, my car takes 275/40-18s. Will this be much of a difference ? I understand that there is 1"difference in height, it will mess my speedometer up I m thinking,and increase rpms at the same speed as now.Not sure if it is a good idea to take these or not, they are brand new, and the price is right.
Opinions please.
Thanks Al
Opinions please.
Thanks Al
Melting Slicks
Joined: Jun 2010
Posts: 2,809
Likes: 3
From: Yorktown Virginia
You will throw codes for Tcs I believe because of the reduced diameter. The computer factors in the difference from front to back and if there is too much the traction control and stability control wont work.
Tech Contributor
Joined: Aug 2008
Posts: 2,902
Likes: 21
From: Oak Hill Virginia
I've posted this a few times before. Hopefully this will answer your question.
Your rear tires MUST be a MINIMUM of .5" taller than your fronts or your tc/ah will be annoying as hell. It will kick in often and for no apparent reason. The stock fitament provides a 1.1" height difference between fronts and rears.
There are calculators out there; but if I remember correctly (someone correct me if I'm wrong) the formula for calculating the diameter of a tire is:
((Width X Aspect Ratio X 2) / 2540) + Rim Size
So... for example; If you wanted to run a 285/45/19 Tire on a 19" rim your height would be:
((285 X 45 X 2) / 2540) + 19 = ~29.1 Inches
Again; just make sure your rears are AT LEAST .5" higher than the fronts.
Your rear tires MUST be a MINIMUM of .5" taller than your fronts or your tc/ah will be annoying as hell. It will kick in often and for no apparent reason. The stock fitament provides a 1.1" height difference between fronts and rears.
There are calculators out there; but if I remember correctly (someone correct me if I'm wrong) the formula for calculating the diameter of a tire is:
((Width X Aspect Ratio X 2) / 2540) + Rim Size
So... for example; If you wanted to run a 285/45/19 Tire on a 19" rim your height would be:
((285 X 45 X 2) / 2540) + 19 = ~29.1 Inches
Again; just make sure your rears are AT LEAST .5" higher than the fronts.
Team Owner
Joined: Mar 2004
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From: Oklahoma City OK
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