Anyone know anything about wheels/tires?

[rhuprect]

99octane wrote:

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P205/70/13
The 205 is the width in millimeters,
The 70 is the height ("Tallness") of the tire or how much tire sidewall you see from the rim's edge to the tread,
the 13 is the rim diameter in inches.


Greg

I always thought that the 205 was the height and the 70 was the width??????

[sunburninaz]

I always thought that the 205 was the height and the 70 was the width??????

See - it's good to learn something new every day!

While the 70 in this case represents the height (or "tallness"), it is not the actual measurement - it is the ratio (of width to height). Quitesimply, using your numbers, the tire is 205mm wide and has a sidewall measurement of 143.5mm (205 x .7). Put into inches (25.4mm/inch), the tire is just over8 inches wide (205/25.4 = 8.071) and the sidewall measures 5.65 inches.

Nothing that Tirerack doesn't expound on but I don't think anyone's actually done the math here yet...

You can put a pretty fat rim and tire combon on most cars if you get the backspacing just right.

Not sure if Greg is actually referring to add-on spacers or, for that matter, how much spacers are even used anymore. If you stick with factorywheels, at some point (likely well beyond Bruce's 10mm difference) you may need them. I think that aftermarket wheels now typically rely on their"offset" (that is, how much of the rim is in front of the center disk and how much is behind it - think "deep-dish" for an example) toadjust for tire width.

Doug

[Redline Whiteline]

my duster came factory with 14 inch wheels, i had to use custom made 1 1/2" billet aluminum wheel adapters to fit the 275/60/15 tires out back

[Phildirt]

Frank (rdln66), I hope you read and heed, 'cause I remember your tires are ancient!

Simply put, a sidewall aspect ratio (middle number) of 70 means the sidewall is 70% the width of the tread (thus regulating height). --p