i cant believe a tire specialist told me it was height..
well i guess illl be going to a different shop
so 35/12.5/18 would be the best bet? and its 35/65/18 right

 

Very seldom can you ever trust the words of a salesman. It's a sad thing but that's what happens 99% of the time -- a consumer is misinformed and unhappy with the outcome due to either a salesman and his sales pitch or one that is simply not qualified to do his job.

I'm going to try and clear this up for you a bit if you don't mind.......

A 35/12.50/18 is what you're looking for if you're wanting to run 35's with your stock 18's. There is no such thing as a 35/65/18 so you would need to ask for a 35/12.50/18. Tire sizes are a little confusing when you get to dealing with standard and metric sizing. The 35/12.50/18 is a standard size and the 325/65/18 is a metric size. Standard/metric units are never mixed when stating the size of a tire -- that would be extremely confusing. Standard size tires are measured in inches and metric sizes are measured in millimeters so most of the time when a metric size is given for any one tire a standard size is also given that closely resembles that size. Roughly comparing sizes of metric and standard sizes is pretty simple with the use of a calculator.

For example the 325/65/18 tire in question...... 325 is the width of the tire and the 65 is the aspect ratio which will give you the height of the tire in relation to the width. You need to multiply 325 *.65 which equals 211.25 and then multiply that *2 since you have two sidewalls in the height of a tire. That number equals 422.5. Now divide 422.5 by 25.4 since there are 25.4 mm in one inch and that gives you a total sidewall height of 16.63 inches. Now you need to add in the rim size which in this case is 18" which comes to a grand total of 34.63 inches tall. The tire has an aspect ratio of 325 mm which equals 12.79 inches wide. So "technically" a 325/65/18 is a 34.63x12.79x18 tire in standardized form but we call it a 35x13x18 just to keep it simple.

Sorry to ramble on about the subject but I got screwed my first time around buying tires for my old truck and I like to try and help others on the subject whenever possible.

 

wow lol
thanks a bunch tho, clears up alot..
but this is the thing, the tire sticker said 325/65/18, but then under it, it said 35/13.00/18, thats where i got lost

 

And there's absolutely nothing wrong with that. Like I said..... Toyo puts 35/13.00/18 under the metric size just to make things simple. The tires you have can be considered both a 325/65/18 or a 35/13.00/18 depending on if you want to talk about the tires in metric form or standard form.

 

so is that tire ok to throw on my stock rims?

 

Both a 35/13.00/18 (325/65/18 in metric form) or a 35/12.50/18 will mount on a stock rim but most reputable tire shops will advise against it. With that being said you will most likely never have a problem except with uneven tread wear due to mounting a wide tire on a narrow rim but "popping" a bead could happen since the tire is too wide for the rim. If it were me I wouldn't run any larger than a 305 series tire on a stock wheel and that's pushing it but many many people run 325's on stock rims. 285 series tires are an excellent match but it's hard to find them in a 35" height and if you do they'll probably look awkward since the tire would be tall and narrow. I do use my truck off-road during hunting season so that plays a role for me as well.

 

well i will probably get aftermarket rims in a while, so maybe ill get them.. what do you think about spacers on that wheel?

 

spacers are "okay"

I'm not a fan of them, but they do get the job done...but there are things to watch out for.

Nuts/Bolts have a minimum "Thread Protrusion" that you must achieve for that Nut/Bolt combo to have their maximum strenght & safety.
By using a spacer, you are essentially shortening the effective Wheel Stud length. This in turn may reduce your Thread Protrusion. Which is never a good thing.



is this just a 1/4" thick plate of metal?

or

is this a 1.5" to 2" thick "adapter" that has 6 new wheel studs?

or

did they install new longer wheel studs?

 

Im trying to find a large spare tire to fit on my stock 18" rim. I have 325/60/20's but I want a equal size spare. So; 315/70r18, 295/75r18, 275/80r18. I dont need it to match or be in good condition, lol. Just need a tire.

Another thing, do trucks with suspension lifts have spacers on them? Or do the new componets up front move the tires out sideway.

 

A 285/75/18 would also work for a 35" spare -- I think I've seen that size before. And for the suspension question...... most (if not all) suspension systems for IFS trucks increase the front track width.

 

Your tire salesman is a retard

 

indeed, i just called him and told him to stick the 35s up there, cuz ima get them online and go to a mexican shop and get em done.
well now i need to order tires, and idk if the same size they got will fit, ima try and order 35/12.5/18.. im just worried about the uca rubbing alot..any suggestions? if someone has that size tire on stock 18inch rim, can i see the gap between the tire and uca? ore if anyone finds a pic

 

the width of the tire is 325 right? in order for it to clear the uca, would i need 315/65 or will 325/60 do the trick? whats the difference

 

No, you need a 35 12.5, not a metric size, 325 is 13 wide, yøu either need a 285 65 or a 305 65 if you want to go metric

 

so i found out that toyo dont make 12.50 in ats, the closest would be 13.00..
now, if i do get that tire, i would need spacers, but i would also get extended studs.. what do you guys think?
ps. i appreciate you guys helping out.. couldnt do it with out you