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RE: [T3] Tire Sizing Questions


Doug Brashear replied directly:

>> So the stock tire is basically a 165/85R15,
>> correct?  So if I ever wanted to try a lower profile
tire,
>> that would make the 85 decrease to 80, 75, or 70, right?

Yes, the stock tire is a 165/85R15, with the 85 being
implied.

As for lower profile tires, anything less than 85 series
would be lower profile, but low profile performance tires
are usually considered to be 60 series and lower.

Be careful about changing the aspect ratio (series) of your
tires though.  This will almost always change the tire
diameter and thus your speedometer reading for the front
tires and the rear tire changes could affect your cooling
by changing the engine (RPM) speed relative to driving
(mph) speed.  To change aspect ratio without changing your
tire diameter you have to go with the "plus sizing" system
and larger diameter wheels.  See the TireRack website for
an explanation.

http://www.tirerack.com

-- 
John Jaranson
Research Engineer
Ford Motor Company
SRL 2621
Dearborn, MI  48121
(313)323-0553
(313)845-4724 FAX

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