pics of 39's on stock M715

I never knew until today, how much time and effort went in to changing tires on a too piece rim. But anyway, here are some pics of my new 39.5x13.50 R16 Super Swamper Iroks on my stock M715 suspension & 2 piece rims. Without any real articulation testing, I don't know if they will get into the fenders or not. When I crank the steering wheel all the way to the right, it does rub on something.

But "WOW" I love them on my M715. That is the only stock jeep I know that can fit 39 swampers on a stock Rig. Enjoy the pics & let me know what you think...:D
http://img207.imageshack.us/img207/2130/1000123ue5.jpg
http://img72.imageshack.us/img72/9031/1000259cr1.jpg
http://img142.imageshack.us/img142/9474/1000262vs7.jpg
http://img72.imageshack.us/img72/8418/1000260wm8.jpg

in my opinion ( but who am i ) take the frame extensions off the front and set the front bumper back it will look more porpornate. j cabs are comming in style and alot more comfy too......
drive on zoner

Wow they surely fill up that wheel well, they look good, about the same radius, nothing like a good fatty! Tire that is.

Mounted on factory rims...and it looks good. You just saved me around a thousand dollars...

Unfortunately you now have me taking a new look at that J cab I have. But I just bought a canvas top for the M cab. Crap...

2 reasons for the frame extentions: 1. the 16.5 Warn winch I'm saving for is going in there, & 2. Deer are a major problem where I live and the bumper and extentions have already saved me from some Deer Damage.

That's a pretty wide tire for a stock rim. Might wear the center out real quick.

Looks great.

Looks great! How bad is the rub?

What tube size and flaps did you use? Is it a light rub orcut your tires up rub? I'm askin cause I like the look!

Here are some day time pics. I used the tubes from the other tires and as I recall, their were 3 different sizes in the other tires. We had several beers over the coarse of the night so parts of it are a little fuzzy...:oops:
http://img329.imageshack.us/img329/3079/1000266ly2.jpg

With the stock rims the rear tires are close to the tires, but not close enough to rub
http://img177.imageshack.us/img177/4763/1000267al2.jpg

On the passanger side front, the tire is rubbing on the lower edge of the inner fender. You can see it in the center of the pic below. Nothing a hammer and sawall can't fix.
http://img176.imageshack.us/img176/638/1000269vu8.jpg

You may want to think about changing out the tubes and flaps. You need to make sure you are running radial tubes and flaps with radial tires. If not heat can become a big problem for you. What PSI are you running?

Green with a J-cab, same as mine. I have Buckshot's on stock rims. Do the taller tires make much differance in gearing (rpm) at highway speeds (50mph)?

The 0nly way thoughs tires are coming off thoughs stock rims is if I finally get a 1 piece rim.

And we put 12 psi in each to start and I'm going to drive it around town tomorrow and adjust from there...

Point of reference for gear ratio effect due to tire height....

A stock 34 inch tire with a swap to 4.56 gears = a 44.5 inch tire with the stock 5.87 gears.

So if you keep the stock gears and put 44.5 inch tires on, its like changing the stock truck to a 4.56 gear ratio....

This combo, 39's, is roughly halfway between...

Except, of course, these are no longer 39.5 The arch across the tread from the narrow rims has added an inch or more to the center height(and reduced the contact patch accordingly). Still, it looks GOOD!

they measure 38" tall with 12 psi

That's with the weight of the truck on them, right?

Porky ,There Bias not radials.

The effect of the larger tires can be calculated like this:

old diameter / new diameter * gear ratio = effective ratio

So:

34 / 38 * 5.87 = 5.25

I should have also mentioned that you can apply this directly to engine RPM at a given speed:

old diameter / new diameter * old RPM = new RPM

So if we calculate for change in RPM at 50 MPH:

34 / 38 * 2900 = 2595 RPM

Quote:

---

Originally Posted by vrod02

Porky ,There Bias not radials.

---

Cool. Thanks.

Well I took the m-truck on its long road trip in the 5 months I owned it. 82 miles around trip to Wal-Mart. The tires ran good know unusual tires pressure problems. When I did make it home I increased the psi from 12 to 25 and then drove around some more but couldn't tell any difference. I still haven't cut the inner fender yet,& that is where the rub is at.
I did manage to clear some of the junk out from my 87 GW, & put them side by side to compare. The GW has only 1" less difference between the 2 diff. covers, & 2" less to the bottom of the leaf springs. The GW is on 35" SSR's, 10" lift, 4.56 gears, and a Detroit.
http://img304.imageshack.us/img304/8735/1000271sv8.jpg

nice!

its been 2 1/2 years since this post & the Iroks are still running smooth.....................:)

Quote:

---

Originally Posted by boondockster

I should have also mentioned that you can apply this directly to engine RPM at a given speed:

old diameter / new diameter * old RPM = new RPM

So if we calculate for change in RPM at 50 MPH:

34 / 38 * 2900 = 2595 RPM

---

Way off the subject. "Boondockster" the 1st NJ jeep club (1969) was the Boondock Blazers. And was started up in your area (Sparta)

The 715s definitely look better with 38s or larger.