I posted this in the second gen forum as well.

I have noticed that alot of third gen duallys on 35's lately. I don't tow any more and that has me thinking about getting 35's. I know that you need to run a 2" spacer in the rear. I was wondering how the 35's are wearing when mounted on the 6" dually rims. Any thoughts or info would be appreciated; any pics would be good too.

Thanks

 

Mine are wearing pretty well. I have about 25K miles on them. I'd guess they have 10K more maybe left in them. The 2" spacer is plenty for mine, I have plenty of room between the two.

 

That is the kind of feedback I was looking for. The only thing that concerns me about the 35's is putting a 12.5" tire on a 6" rim.

 

The tread is only 10" on my 35's. I just went out and measured them.

 

It's only 10 because it's squeezed onto a small rim... the tire size itself is 12.5"s wide.

 

The 12.5 comes from the aspect ratio of the tires, not necessarily the width in inches. On a 35" tire, 35" is the distance from the outer sidewall to inner sidewall , the 12.50 isn't always equal to the actual width b/c it's the distance from the rim to the tread, or it's 125% taller than it is wide, not the width. Section width is what I measured on the truck, b/c that is what's touching the road, 10 inches.

 

Dude, you're thinking of metric tire sizes... I have 305/55/20's which is 33.2"s tall and 12"s wide with 6.6"s of sidewall.

For your radial tire size of 35x12.5x17 is equal to a 305/75/17 in metric.

Radial sizes the first number is the overall height, second is the tread width and last is rim height.

Metric sizes is first number is tread width in mm's, the second is the percentage of the first to make the sidewall and the third is again the rim height.

Which is why I said your 12.5" wide tire being squeezed onto a 6" wide rim squeezes the sidewall in so it's narrower, but in doing so actually makes it a bit taller of a tire.

 

Metric sizes is first number is tread width in mm's, the second is the percentage of the first to make the sidewall and the third is again the rim height.

Bubba,
I think you have this wrong. The first number is the distance from the center of the tread to the center of the side wall. The second number is the aspect ratio of the tread verses the sidewall height. The third number is as you stated, the rim diameter.

Please note that it is possible to have two identically sized tires that are not the same. This is due to the myriad of ways the tire sizing can be interpreted. It is for this reason that you must always use tires of the same manufacturer and series (read mold) on the same axle.

Steve

 

Yea, I know that having a lower first number and a higher second number and having a higher first and lower second with rim changes can be the same... just as a 305/75/17 (35x12x17) is the virtually the same as a 305/65/20 (35.6x12x20) which you can check on this as well as anything else for tire sizes from a link I have saved at http://www.1010tires.com/TireSizeCal...?action=submit

Now, as for measuring tire sizes... in metric sizes like I stated as above with a 305/75/17, the 305mm is the width of the tread, the 75 is 75% of the 305mm width to make the sidewall from the edge of the rim to the tip of the tread.

 

To help yall understand... here's a page that lays it all out.

http://www.tiresafety.com/size_class/size_nav.htm

Let me know if I can help anymore.

 

I guess Interco doesn't know how to make tires then, if they're supposedly 12.5" wide, because mine are only 10" at the widest point on the tire. The same goes for the new un-mounted tire I have in the garage for a spare. Or maybe my tape measure is wrong..

 

I have seen some interco's like that... Also look at some Drag slicks... they say 9 inches wide.. but they measure like 12 inch.... almost like a cheating thing..

One things for sure... I would go by physical measurements, not the side wall

Check there site --- I see 10 inches THREAD width for the 35x12.5
http://www.intercotire.com/html/trxus_mt___sts.htm

 

I haver them on mine and like them, they ride good and are good in snow. I think the reason you see so many people using that size is for a couple of reasons, one is tire selection for 17" dually rims are slim and all the H2 Hummer dealers taking off the 315's and putting on the bigger 20" and larger wheels. That's where I got mine. I have some pics in the photo gallery. No negative issues so far, very pleased.

Johnny

 

I have BFG A/T 315/70R17 on my dually and love them. I don't have that many miles on them
yet but they look like they they make pretty good contact to the road.
I run 45 to 50 psi in the front and 40 in the rear.

 

Caseyd, do you have your lug nut caps on the duals? It doesn't look like it in the pics. I had to cut my studs down to fit my caps back on.