JYogi

OK
Sorry I have tried and tried yet I can't speak tire.

Can someone help me translate these sizes??
Tell me what the variations are?

I know I want at least 33's but not 35's (I don't think the Cooper does a 34)
I know I want/need 17's due to the wheels I purchased (AEV Pintler)

265/70R17
285/70R17
33X12.50R17 (now why do they throw in the size in that form for that one??)
295/70R17

Which should I get, the 295?? or the 33X12.5R17.

TINMAN080

Hi! JYogi, tirespeak is not too difficult, let the calculating charts talk to you. A 265/70/R17 is 31.6 '' in diameter. A 285/70R17 is 32.7 in diameter. A 33X 12.50R17 is 33'' in diameter and 12.5'' in cross section. (how fat) These are non-metric tire measurements for this particular tire. A 295/70R17 is 33.3'' in diameter with a cross section of 11.6 ''. As you can see the cross section of the 33X12.5 is a little ''fatter'' than the 295/70R17, even though the height is almost identical. The 33X12.5 would fill up your wheelwells a little better. As you can see the chart will help you visualize the size of the tires and it boils down to the cross-section and how much you want. Hope this helps...

Ryno

Let's use 285/70R17 as an example.

285 is the section width. It's the width of the tire in millimeters.
70 is the aspect ratio. It indicates the height of the sidewall in relation to the section width. An aspect ratio of 70 means that the sidewall's height is 70% of the section width.
17 is the rim diameter in inches. The R simply means that the tire is a radial tire, which is what you want.


So, to find the overall diameter of a tire we have to do a little converting.
First, you convert the section width to inches by dividing by 25.4, because there are exactly 25.4 millimeters in 1 inch.So, the tire is 11.22 inches wide. Now we multiply by the aspect ratio to find how tall the sidewalls are.Since we have two sidewalls, we have to multiply by 2.Then add the diameter of the rim.So the overall diameter of a 285/70R17 tire is approximately 32.7 inches (without the weight of the vehicle sitting on it).

Warthog

OK...

So if I wanted a 35" tire on a 17" rim would that be a .... 315 75 17?

And if that work out how do I know how much back spacing I have with my factory Rims and how much added spacers I need...not to mention where is a good place to get my spacers?

Help

Seir

Found this tire size calculator...pretty cool...
Tire Size Calculator

According to it, on a 17" rim you would be looking at 305/75 to get to 35"; 315/75/17 would end up being 35.6".

Not sure on all the backspacing stuff...sorry

Ryno

Most tire companies label their 35-inch tires 35x__R__. The tires you want are 35x12.5R17. Convenient, eh? I believe the closest metric size would be 315/70R17.

Your stock wheels have 6.25" of backspacing. 1.5" Spidertrax spacers are what most people use to reduce their backspacing and eliminate rubbing.

You can pick up a set of 1.5" spacers from Northridge4x4.com. Keep in mind that wheel spacers are sold in pairs.

http://northridge4x4.com/proddetail....SPIDER-WHS-010

TEEJ

Of the above, assuming the Pintlers you got already have about 4.5 - 4.75" of backspacing or less...(You didn't mention the BS...)...the 33X12.5/17 would be perfect.

You want a wide section width (The 12.5 part), and that's the widest you listed...the others are equivalent to 10.5 - 11.5"-ish, too little)

The 17 means it fits a 17" rim

and the 33 means its diameter is 33".



The reason they listed that one like that is they are insane.

No, actually, Light Truck (LT) Rated tires are rated in terms of that format (Like 33x12.5/17).

PASSENGER CAR (P) tires get the 265/70/17 type sizes. (P-Metric)

So, if getting a tire meant for a truck, get an LT.

If getting a tire meant for a car, get a P-Metric tire.



If you get a PASSENGER CAR TIRE...make sure that the LOAD RATING for the tire is about 10% HIGHER than you WOULD HAVE GOTTEN in an LT size.

That helps to compensate for getting a lighter duty tire.

Now, just because they ARE insane...they sometimes mix and match the way they label the tires, just to F with you (Your Jeep CAME with P-Metric Tires for example...but, the load ratings were higher than if an LT had been used at least, etc...)

LT's are typically more expensive than P-Metrics due to heavier construction...but a high performance P tire can reverse that trend, etc.

You want a Cooper tire I take it?

The STT's are sweet.

If you want more like a 34" tire, look for 305/70/17's....the MT/R for example comes in that size, etc...

Hope that helps!

Warthog

Thanks Gang.

I think I am going to be a little more dangerous now. You know what they say a little knowledge is dangerous .

I hope that I can help one of you out as well as you have helped me out. This is the first time I have got some stright answers.

Keep it rubber side down,

Warthog.