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How to determine tire sizes!!

 
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Old 17 Oct 2012, 08:54 am
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Default How to determine tire sizes!!

("borrowed" from another site)

To help you understand tire sizes a little better here's a quick lesson.
For an example we'll use a fairly common tire size for trucks with a 3" lift, a 285/70/R17.

We'll first label the parts as follows:
285/70/R17
_^__^__^
_A__B___C

A- This is the width of the tire in millimeters. The conversion is 1"= 25.4mm so for our example: 285/25.4= 11.22" width.

B- This part is the "aspect ratio" of the tire and is a relation of the tire's width to the sidewall height of the tire. In our example it's '70'. This means the sidewall height is 70% (.70 in calculation) of the width of the tire. That means the sidewall height is:

11.22 x .70= 7.85"
BUT there is a 'sidewall' both above and below your wheel when measuring height, so you must multiply this by 2 when calculating the tire's overall height.

C- This third piece is simply your rim size. So, for a final calculation of a tire's size, you add this to the total from part B.

In conclusion, a 285/70/R17 equates to 11.22" wide and is (7.85x2)+17"= 32.71" tall, or basically equivalent to a 33x11.50R17 if we called it a standard size.

How about one more example, 265/75/R16:

Width: 265/25.4= 10.43"
Sidewall: 10.43 x .75= 7.82"
overall height: (7.82" x 2)+ 16"= 31.64" tall. Basically, a 32x10.50R16

This method of finding a tire size will work for every metric tire size out there!

NOTE:
It should also be mentioned that different manufacturers' tire sizes will slightly vary from these calculations. Its usually a very minor amount but it's still there none the less. For this reason I recommend everyone looking at tires to go to the respective Manufacturers web site and look up the exact specifications they list for the tire before buying a set, or to compare tires between different manufacturers.

Hope this helps someone and that you can calculate tire sizes without having to be reliant on a program.
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Old 17 Oct 2012, 09:04 am
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Default Re: How to determine tire sizes!!

This is a good calculator if you are curious about putting larger tires on?

Tire Size Calculator - tire & wheel plus sizing
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Old 18 Oct 2012, 08:31 am
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Question Re: How to determine tire sizes!!

yea i had a set of tires given to me ( brand & new free!!)
only issue is that they are 205-60-16 not 205-55-16. visual stance is roughly 0.75" - 1.25" taller than the stock size. so i guess i dunno if they will work on the front because i dont want to bottom out and scrub the tire or turn and hit. any advise would help!



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Old 18 Oct 2012, 11:00 am
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Default Re: How to determine tire sizes!!

You know when I shop for tires I look at the tread pattern first above anything else. If you think about it look at your car/truck and see how really very little of the tread actually makes contact with the tarmac. Then think about how much a car/truck weighs? Yup the tread pattern is the most important to me. I hate that the DOT really restricts what we have for tires.

Tire candy!


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Old 18 Oct 2012, 03:20 pm
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Default Re: How to determine tire sizes!!

do you think ill have enough clearance for these tires??
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Old 18 Oct 2012, 05:30 pm
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Default Re: How to determine tire sizes!!

If you are asking me ...sorry I don't know with the PT? Maybe a couple members that have gone the insane tire size route can chime in with some information? I don't have the connections I use to with any tire/wheel shops to spend the day swapping out different tires and wheel combination to see what looks and fits the best. I will be watching the responses on this one as well as you though!
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Old 18 Oct 2012, 11:12 pm
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Default Re: How to determine tire sizes!!

Well, definitely purty. What is it about one tread pattern that makes it more desirable over others? Or should I ask...what is the best tread pattern to purchase?

Quote:
Originally Posted by NitroPT View Post
Tire candy!


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Old 18 Oct 2012, 11:28 pm
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Default Re: How to determine tire sizes!!

The Mileage, Ride quality,Speed rating, Traction level, Season rating,etc. there is no one perfect tire. Every tire has pros and cons. You have to first ask yourself what you would like to get from a tire and how you "honestly" will be driving your PT and what will be the most common road and weather conditions.
The recommendations will come out like aunts to a picnic around here! But I think selection of tires should be a very personal event. It is good to ask others what they use and why but just remember the opinions like PT's like people are all different. It is a pretty fair investment for some and it would be prudent to talk to the professionals who sell the tires. Once you have gathered all the information you will be surprised how it narrows down the choice to only 3 or 4 brands and models. When it get that close then you do the human thing and go for looks, cost and warranty... maybe in that order?
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Old 18 Oct 2012, 11:44 pm
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Default Re: How to determine tire sizes!!

Thanks for the response Nitro. Wow! I had no idea there was so much to consider when choosing a tire.
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Old 19 Oct 2012, 02:33 pm
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Default Re: How to determine tire sizes!!

I like the continental extreme contact DWS Tires. They are the highest mileage rated ZR tires out there.

They still look brand new too, not bad for 1.5 years later

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