Load Index 125 - Load Range F

[Ratbert]

How does tire mfg work, ie, changes required for different wheel size vs load rate ? F’s first for 18” up PU wheels makes sense.

I was speculating that they'd produce those in highest demand first, but no, I have no real clue.

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[2nd 392]

I was speculating that they'd produce those in highest demand first, but no, I have no real clue.

My thought was if a change for wheel size is comparatively simple, then they might as well make 17’s too. F’s first because if your PU use requires F’s you can’t run D or E. F’s will work on all….

 

[engineXI]

my tires are "E". they are fine. how much different can F be?

 

[Zandcwhite]

Those sidewalls are deforming with every rotation. Each iteration results in wear and heat. I know you've done it, but I sure wouldn't want to travel far at speed.

This is true, depending on the tire and psi and load. The Yokohamas in particular were load range d so they have thicker sidewalls than a c rated tire and in this thread we are talking about load F tires. I'd bet those sidewalls don't deform much at all on a Jeep at 15psi. Also remember that was 15psi cold. Warmed up on the freeway they were 18-19psi the entire trip home. In my experience that's not low enough to cause significant sidewall deformation or heat or damage. The 39s on the Jeep now are load range E and street pressure is set at 25psi cold. I would absolutely jump on the freeway and cruise 85mph with these at 15psi. I stand by the statement that no damage or wear will occur running a load F tire at 15psi on a Jeep.

 

[ParadigmDawg]

But nitto can manage to build their tires so they weigh more than a like sized tire in a load F so there's that.

I really don't understand what you are saying. Every tire you listed can be had in the proper load rating for a Jeep.

 

[Zandcwhite]

I really don't understand what you are saying. Every tire you listed can be had in the proper load rating for a Jeep.

Nittos are some of the most over weight tires in any load rating. Most 37x12.50s are in the 60-75lb weight, nittos are all 80+lbs. I think the mud grappler is 85lbs. That's a heavy tire that doesn't seem to perform or wear any better than tires weighing significantly less. At least if they were load range F you could justify the weight from 10-12ply sidewalls that are nearly bulletproof.

 

[ParadigmDawg]

Nittos are some of the most over weight tires in any load rating. Most 37x12.50s are in the 60-75lb weight, nittos are all 80+lbs. I think the mud grappler is 85lbs. That's a heavy tire that doesn't seem to perform or wear any better than tires weighing significantly less. At least if they were load range F you could justify the weight from 10-12ply sidewalls that are nearly bulletproof.

They are tough and grip like mad and don't rip easily. I have run them on several vehicles and I have always had the HP and torque to push them just fine.

 

[Zandcwhite]

They are tough and grip like mad and don't rip easily. I have run them on several vehicles and I have always had the HP and torque to push them just fine.

And the same can be said for stt pros, Yokohamas, and others that weigh 10-20lbs less.

 

[ParadigmDawg]

And the same can be said for stt pros, Yokohamas, and others that weigh 10-20lbs less.

We don't have to like the same tires. I know what works best for where I wheel.

 

[CaddyshackGopher]

Good question. And why the hell is BFG releasing the 37" KO3 initially in an F (37x12.50R17/F)? No thanks.

I noticed the same thing, doesn't make sense. Going w/ Mickey T's Baja Boss AT next Spring. Jeeps/Broncos are a huge market and BFG rolls out this popular size in F!

 

[Ratbert]

I noticed the same thing, doesn't make sense. Going w/ Mickey T's Baja Boss AT next Spring. Jeeps/Broncos are a huge market and BFG rolls out this popular size in F!

Yep, those look interesting. I'm not sure how well they'll handle our snow though. It's soooo much fun running trails in fresh powder.

 

[jeepingib]

When picking tires and wheels you really need to consider that they are a crucial part of your suspension. By going with a stiff load range tire, and a large wheel diameter to tire diameter ratio, the ability of the tire to flex and absorb things from the road is substantially decreased. It's going to ride pretty roughly.

 

[4xFUN]

Good question. And why the hell is BFG releasing the 37" KO3 initially in an F (37x12.50R17/F)? No thanks.

Yup, that tidbit made no sense when I first read it! I was looking for the 37" KO3 release date but was so far out I went with the tried and true 37" KO2 D's and perfectly happy!

 

[CaddyshackGopher]

Yep, those look interesting. I'm not sure how well they'll handle our snow though. It's soooo much fun running trails in fresh powder.

MT Baja Boss A/T's are Snow Rated.

 

[Ratbert]

MT Baja Boss A/T's are Snow Rated.

Yep. I'll need to do some research to see how well they actually do in snow.

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