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BF Goodrich 7.5R KM3

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masscj2a View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 20 July 2019 at 6:09pm
Oldtime I will post pictures of my rims a little later. Let me know if you think the silicone will work. Thanks
The tires were listed at 4WD Hardware for $25 off each tire when you buy four. I they listed there for $176 each prior to discount and no sales tax and free shipping. Win, win.
 
 
Here are my two worse rims. One KH one ? Let me know if you think silicone would work or tubes? Thanks again.
 


Edited by masscj2a - 21 July 2019 at 11:48am
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bill2A Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2019 at 2:01am
I suppose that you could weld plugs into the rusted out holes and drill new holes at another spot.
Tubes will cure the sealing problem, but if there are shape edges around the rusted holes they might cut the stem.
1946 CJ2A 14098
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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2019 at 12:25pm
Bill that's what I was thinking as well. For the time being, I'm going to have the Eldorado tires dismounted and the bfg's mounted on those rims. I can work on these later.
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Spinnas Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2019 at 3:26pm
Originally posted by oldtime oldtime wrote:

Tire Fit :
I run standard suspension and wheels on all my flatties so I want my tire diameter at maximum possible height and  tread width without any body or spring rubbing.

If front tires on a Dana 25 flat fender get any bigger than 31" tall at 6" outermost tread width you will have to reduce the steer angle down to something less than 29* which is the maximum angle  for the Rzeppa axle shafts.
At about 31.5" tall and 6.5 wide I can run 27-1/2* angles (Spicer axle shafts ) without rubbing the leaf springs.

The widest part of the rear treads begin to rub the wheelhouse at full stuff angles at about those same tire diameters and tread widths.
So even if I install thin rear wheel spacers I like to stay below 32" and 7" wide.


Yep, the 7.50-16s like to rub the vertical inside of the rear wheel wells on stock wheels and really limits turning angle. I got some 16x6 steel wheels made with 2.75" BS. Spaced the tire and wheel out ~1" on the inside and ~2" on the outside compared to stockers. The tread does not stick out the side of the body, maintains turning angle, doesn't rub the tub, and sits just at flush with the front locking hubs.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Nothing Special Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2019 at 5:42pm
Originally posted by oldtime oldtime wrote:

....  I don't understand why BFG made them so stiff. 
Typically the 235/85R-16 sized  tires are built in 10 PR since that size is most frequently used for trailers. 
That said I'm not sure why anyone needs a "mud" traction  tire on their trailer....

LT235/85R-16 was the stock tire size for Ford 3/4 ton and 1/ton pickups through at least the '80s and '90s.  I think Chevy and Dodge might have used them too.  That's a lot of 4WD trucks that want load range E mud tires.  Trailers only use LT235/85-16 tires because they are available for the trucks and (arguably) hold up better than trailer tires.
Bob

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'71 Ford Bronco
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 22 July 2019 at 7:46pm
Quote

LT235/85R-16 was the stock tire size for Ford 3/4 ton and 1/ton pickups through at least the '80s and '90s.  I think Chevy and Dodge might have used them too.  That's a lot of 4WD trucks that want load range E mud tires.  Trailers only use LT235/85-16 tires because they are available for the trucks and (arguably) hold up better than trailer tires.
OH O.K. Bob !
I just noticed that a lot of trailers are running that size of tire and figured that's why they are virtually all 10 ply rated.

The more modern 85% aspect ratio is a tad wider than I like. 
On my jeeps I rather prefer the old 100% aspect ratio that was used with early numeric tires.
Apparently the new BFG 7.50 /16 appears to be somewhere near the old 100% aspect ratio.

The reason mfgr's went to a lower aspect ratio was to reduce possible roll or bead separation during fast cornering. 
A long time ago the 78 aspect ratio was determined to give the greatest ride height while keeping side roll to a minimum. 
And that's why the 78 and later 75 series aspect ratio have been common for so very long .

Masscj2a, I really don't know if silicone will hold or not but I would consider trying it in a pinch so long as the hole was not oversize and the silicone was allowed to cure overnight before using it.



Edited by oldtime - 22 July 2019 at 7:51pm
Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963)
Zero aftermarket parts

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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 23 July 2019 at 12:11am
i have two more similar rim's on an old cj5 out back. I'm going to dismount the 100 year old bfg on those and see how badly rusted those are. Then I will get them blasted and if good, I will paint up a set of five. But for now, I am going to mount them on the steel rims on there now. Going to get that done tomorrow morning. Thanks for the input.
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2019 at 2:23pm
OK, got a little side tracked this week. Decided that the brake line kit I have gotten from KW was not the correct one for my 3b, so sent it back. Not their fault I guess as we know how these things go, one owner changes something and everything is off. I have 11 inch drums all the way around, so that was a problem. So decided to go ahead and make all of my brake lines myself. Bought all new flex lines, fitting and clips and had at it. Good news is, all the bleeder screws and fittings came right off. Bad news is I hate doing brake lines, I know as much of you loves doing them, I do not.  8D  Decided to do that while the B was up in the air, awaiting the new sneakers to get mounted. Have the tires and could not pass on doing the lines at this point. Then yesterday when I was done bleeding the new lines, I went for my test drive with the new tires. It was great at the beginning, tires are great, ride is better, noise level is down, everything going great right ? Until my oil pressure gauge line let go, spewing motor oil all over the new exhaust and engine. My buddy said it looked like a kamikaze  pilot looking for a place to crash.  So before pictures and time relaxing, it was back in the barn. Repaired the oil line, cleaned the motor compartment off and time to head in for a few drinks. Enough for one day. But here are the pictures of the new sneaks. Lock to lock has no rubbing and still over an inch to spare. I did do the rock climb, but could not take pictures as the gas was exiting my cap at a rapid pace. Just long enough for me to jump out and see that the right rear was off the ground 5-6, left rear was tucked and just slightly away from the inner fender well. But would probably rub with more deflection. The Jeep steered very well and rode pretty good at 25 PSI. May go down to 20 PSI today and continue to release air until something negative happens. Stay tuned for that and an off road ride report. So far I like them. ( Like all my KM2's) Jeep and tires could benefit from a slight body lift and or 1 or 2 inch soft spring lift. 


Edited by masscj2a - 25 July 2019 at 2:26pm
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2019 at 3:52pm
Definitely the best looking Jeep radials I've ever seen.
And the narrow spare tire overhang looks good too.

Ideal maximum diameter on a standard - non lifted  flatty.
They look to tuck up under the fenders real nice while the narrowish rounded tread profile helps to keep the body/spring rubbing to a minimum.

I just gotta have a set of those for my daily driver. 
Now if we could only get them is 6 PR.

Thanks and keep us informed.
Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963)
Zero aftermarket parts

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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2019 at 5:46pm
Not sure bfg will ever make them in six ply, but if they do, let me know. Just put 60 miles on them and still liking them. Next I will drop them to 20 psi on the street and see how they run. Then I will take em off roading. I have a like for the km2, so I'm sure I won't be disappointed with the performance, but don't want to get to deep into mud yet. I'm still doing things to the under belly and hate caked mud in the face. Angry But after a few more things the gloves are coming off. Trail ride in NH on the 10th, so I figure we will see mud then.
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hulk Quote  Post ReplyReply Direct Link To This Post Posted: 25 July 2019 at 5:57pm
What is the width of the wheels you're mounting the new BFGs to? I'm guessing you have something wider than the old 4.5" wheels? 
Matt F. in Colorado - 1953 CJ3A, mostly stock
New forum: International Flat Fender Club
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2019 at 1:26am
Not sure what Mark used but I prefer to run my tires on a rim that's a little narrower than the tire manufactures suggest. 
A narrow rim causes the tread crown to raise under normal air pressures but I tend to run lower air pressure than the tires are able to handle.
So the tire crown naturally flattens as the pressure is reduced.
And the slightly narrow rim also increases the sidewall bulge. 
Extra sidewall bulge helps to protect the rim lip from damage.

The 4.50 x 16" KH wheels are intended for use with 6.00 x 16 tires--- but I like to use 6.50 or 7.00 x 16" tires on those rims.
The heavy duty 5 x 16" KH wheels are intended for use with 7.00 x 16 tires ---but I like to use 7.50 x 16" tires on those rims.
The rarely seen 6" x 16" KH truck wheels are intended for use with 7.50 x 16 tires ---but I like to use 235/85R 16 tires on those rims.
Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963)
Zero aftermarket parts

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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 26 July 2019 at 11:58am
The rims I used were 6.5 inches wide. I also like using narrower rims normally. We call them the poor man's bead locks. Would have gone 6 inch, but these are what came on the Jeep when I bought it. 
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug. 2019 at 11:06am
Well, took the B out for it's first real wheeling so far with the new tires. Went to an area in NH around Hillsboro.  Mild stuff in the beginning but we did get into some granite boulders and ledges. Mostly easy stuff, but some stock flatties probably wouldn't want to do. One spot of mud I watched closely and it was around a foot deep and the tires carried the B right through at just above idle without breaking loose once. I went slow through that just to see where they would spin and they just kept trudging .  One the granite, they never seemed to spin and we went through a couple of up hill Boulder fields. I just pull out the throttle a little bit, kept my foot off the pedals and let the tires work. They did amazingly well. I was running on the stiff side with 20 PSI in the tires. Only because we were running pavement a lot in between. I'm dropping my air down to 15 today to see how street handling on paved roads would be. If descent, I'll run that pressure from now on. I was impressed how well overall they performed. Next time I will supply video.
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug. 2019 at 4:46pm
There was no rubbing of the rear wheel wells or the front tires hitting leaf springs or bottom of fenders. That was with zero lift and stock springs. It was sprung well more than once and had zero so far. Just thought I'd let you know that.
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug. 2019 at 5:19pm
That's great to hear that.
I had already figured it should be a very close fit with stock suspension.

Myself, I love to push the standard limits with very minimal modifications. 
I spent a lot of time thinking about about Willys Jeep tires over the weekend.
Considering every type of terrain and percentage of use on each type of terrain.
Paved road, gravel creaks and roads, dirt and turf, rock (6"+), forest, mud,, Ice, snow, sand, soup mud and more.
No these tires certainly are not specialized for any particular use; but...
The 7.5 KM3's are at the very top of my list for correct size and a "do all" universal design.




Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963)
Zero aftermarket parts

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Post Options Post Options   Thanks (0) Thanks(0)   Quote masscj2a Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug. 2019 at 4:23pm
 One of the biggest reasons I like the km tire line is it's an all around performer. I have never been let down off road and enjoy the pavement characteristics. My go to tire line and they don't pay me to say that either. 🤣
1946 CJ2a Dauntless aka Jalopy
1946 VEC stock
1981 CJ-8 5.3 LS
1966 CJ-6 SBC TUX
1968 CJ-6 225 V6
1974 CJ-6 4.2
1967 M-416
East Coast Modified CJ's
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oldtime Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug. 2019 at 4:42pm
I now have a full set of 5 on order. 
The 4 Wheel price was too good a deal to pass up.

Future plan is to mount them onto 5" x 16" heavy duty  KH wheels on a daily driver flatfender.
Currently building my final F-134 powered 3B .
T98-A Rock Crawler using exclusive factory parts and Approved Special Equipment from the Willys Motors era (1953-1963)
Zero aftermarket parts

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